ASTM B473-07(2018)

Standard Specification for UNS N08020, UNS N08024, and UNS N08026 Nickel Alloy Bar and Wire

ABSTRACT
This specification covers UNS N08020, UNS N08026, and UNS N08024 nickel alloy bar and wire. The alloys shall be furnished in the stabilized-annealed condition, solution-annealed condition, or annealed condition. The material shall conform to the requirements as to chemical composition prescribed. The material shall conform to the applicable requirements as to mechanical properties prescribed. Chemical analysis and tension test shall be made to conform to the requirements specified.
SCOPE
1.1 This specification2 covers UNS N08020, UNS N08026, and UNS N08024 bar and wire other than required for reforging.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 31-Oct-2018
• ICS: 77.150.40 - Nickel and chromium products
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.07 - Refined Nickel and Cobalt and Their Alloys

Relations

• Replaces: ASTM B473-07(2013) - Standard Specification for UNS N08020, UNS N08024, and UNS N08026 Nickel Alloy Bar and Wire
• Effective Date: 01-Nov-2018
• Replaced By: ASTM B473-24 - Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy Bar and Wire
• Effective Date: 01-Apr-2024
• Refers: ASTM E8/E8M-24 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-Jan-2024
• Refers: ASTM E8/E8M-16 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 15-Jul-2016
• Refers: ASTM E8/E8M-15 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-Feb-2015
• Refers: ASTM E8/E8M-13 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-Jun-2013
• Refers: ASTM A262-13 - Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
• Effective Date: 01-May-2013
• Refers: ASTM E8/E8M-11 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-Dec-2011
• Refers: ASTM A262-10 - Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
• Effective Date: 01-Apr-2010
• Refers: ASTM B880-03(2008) - Standard Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
• Effective Date: 01-Mar-2008
• Refers: ASTM A262-02a(2008) - Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
• Effective Date: 01-Mar-2008
• Refers: ASTM E1473-03 - Standard Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature Alloys
• Effective Date: 01-Dec-2003
• Refers: ASTM E1473-94a(2003) - Standard Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature Alloys
• Effective Date: 01-Oct-2003
• Refers: ASTM B880-03 - Standard Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys, and Cobalt Alloys
• Effective Date: 10-Jul-2003
• Refers: ASTM A262-02a - Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
• Effective Date: 10-Nov-2002

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B473 −07 (Reapproved 2018)
Standard Specification for
UNS N08020, UNS N08024, and UNS N08026 Nickel Alloy
Bar and Wire
This standard is issued under the fixed designation B473; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E8/E8M Test Methods for Tension Testing of Metallic Ma-
2 terials
1.1 This specification covers UNS N08020, UNS N08026,
E1473 Test Methods for Chemical Analysis of Nickel, Co-
and UNS N08024 bar and wire other than required for
balt and High-Temperature Alloys
reforging.
1.2 The values stated in inch-pound units are to be regarded
3. Terminology
as standard. The values given in parentheses are mathematical
3.1 Definitions of Terms Specific to This Standard:
conversions to SI units that are provided for information only
3.1.1 Thetermsbarandwireasusedinthisspecificationare
and are not considered standard.
described as follows:
1.3 This standard does not purport to address all of the
3.1.2 bars, n—hot-finished rounds, squares, octagons, and
safety concerns, if any, associated with its use. It is the
hexagons: ⁄4 in. (6.35 mm) and over in diameter or size.
responsibility of the user of this standard to become familiar
1 1
Hot-finishedflats: ⁄4to10in.(254mm),inclusive,inwidth, ⁄8
with all hazards including those identified in the appropriate
in. (3.175 mm) and over in thickness. Cold-finished rounds,
Safety Data Sheet (SDS) for this product/material as provided
squares,octagons,hexagons,andshapes:over ⁄2in.(12.7mm)
by the manufacturer, to establish appropriate safety, health,
in diameter or size. Cold-finished flats: ⁄8 in. (9.525 mm) and
and environmental practices, and determine the applicability
over in width (see Discussion (1)), ⁄8 in. and over in thickness
of regulatory limitations prior to use.
(see Discussion (2)).
1.4 This international standard was developed in accor-
3.1.2.1 Discussion—(1) Widths less than ⁄8 in. (9.525 mm)
dance with internationally recognized principles on standard-
and thicknesses less than ⁄16 in. (4.75 mm) are generally
ization established in the Decision on Principles for the
described as flat wire.
Development of International Standards, Guides and Recom-
3.1.2.2 Discussion—(2) Thicknesses ⁄8 in. (3.175 mm) to
mendations issued by the World Trade Organization Technical
under ⁄16 in. (4.75 mm) can be cold-rolled strip as well as bar.
Barriers to Trade (TBT) Committee.
3.1.3 wire, n—cold finished only: round, square, octagon,
hexagon, and shape wire, ⁄2 in. (12.7 mm) and under in
2. Referenced Documents
diameter or size. Cold-finished only: flat wire, ⁄16 in. (4.76
2.1 ASTM Standards:
mm) to under ⁄8 in. (9.525 mm) in width, 0.010 in. (0.254 mm)
A262 Practices for Detecting Susceptibility to Intergranular
to under ⁄16 in. in thickness.
Attack in Austenitic Stainless Steels
B880 Specification for General Requirements for Chemical
4. Ordering Information
Check Analysis Limits for Nickel, Nickel Alloys and
4.1 It is the responsibility of the purchaser to specify all
Cobalt Alloys
requirements that are necessary for the safe and satisfactory
performance of material ordered under this specification.
Examples of such requirements include, but are not limited to,
This specification is under the jurisdiction of ASTM Committee B02 on
the following:
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys.
4.1.1 Quantity (weight or number of pieces),
Current edition approved Nov. 1, 2018. Published November 2018. Originally
4.1.2 Name of material or UNS number,
approved in 1968. Last previous edition approved in 2013 as B473 – 07 (2013).
4.1.3 Form (bar or wire),
DOI: 10.1520/B0473-07R18.
4.1.4 Dimensions,
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SB-473 in Section II of that Code.
4.1.5 Condition,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.6 Finish,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.1.7 ASTM designation and year of issue,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.1.8 Inspection (15.1),
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B473−07 (2018)
TABLE 1 Chemical Requirements
Composition, %
Element
UNS N08026 UNS N08020 UNS N08024
Carbon, max 0.03 0.07 0.03
Manganese, max 1.00 2.00 1.00
Phosphorus, max 0.03 0.045 0.035
Sulfur, max 0.03 0.035 0.035
Silicon, max 0.50 1.00 0.50
Nickel 33.00 to 37.20 32.00 to 38.00 35.00 to 40.00
Chromium 22.00 to 26.00 19.00 to 21.00 22.50 to 25.00
Molybdenum 5.00 to 6.70 2.00 to 3.00 3.50 to 5.00
Copper 2.00 to 4.00 3.00 to 4.00 0.50 to 1.50
Columbium (Nb) + tantalum . 8 × carbon–1.00 0.15 to 0.35
Nitrogen 0.10 to 0.16 . .
A A A
Iron remainder remainder remainder
A
By difference.
A
TABLE 2 Mechanical Property Requirements
Diameter or
Tensile Strength, min Yield Strength, min
Elongation in 2 in. Reduction of area,
Condition Thickness,
(50.8 mm), min, % min, %
ksi MPa ksi MPa
in. (mm)
B
Annealed, hot finished or cold All 80 551 35 241 30.0 50.0
finished
Annealed, strain-hardened Up to 2 (50.8) incl 90 620 60 415 15.0 40.0
A
For wire only, tensile strength 90 to 120.0 ksi (620 to 830 MPa); no requirements on yield strength, elongation, and reduction of area.
B
Cold-finished shapes require only 15 %, minimum, elongation.
4.1.9 Supplementary requirements, if any, and 8. Mechanical Properties
4.1.10 If possible, the intended end use.
8.1 The material shall conform to the applicable require-
ments as to mechanical properties prescribed in Table 2.
NOTE 1—A typical ordering description is as follows: 200 bars, UNS
N08020, 1 in. (25.4 mm) round by 10 to 14 ft (3.0 to 3.6 m), centerless
ground, Specification B473.
9. Dimensions and Permissible Variations
9.1 Bar—Bars shall conform to the variations in dimensions
5. Materials and Manufacture
prescribed in Tables 3-11, inclusive, as applicable.
5.1 Heat Treatment—The product of UNS N08020 alloy
9.2 Wire—Wire shall conform to the permissible variations
shall be furnished in the stabilized-annealed condition. The
in dimensions prescribed in Tables 12-16, inclusive, as appli-
product of UNS N08026 alloy shall be furnished in the
cable.
solution-annealed condition. The product of UNS N08024
alloy shall be furnished in the annealed condition.
10. Workmanship, Finish, and Appearance
NOTE 2—The recommended annealing temperatures all followed by
10.1 The product shall be uniform in quality and condition,
quenching in water or rapidly cooling by other means are as follows: 1700
to 1850°F (927 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to
smooth, commercially straight or flat, and free of injurious
1204°C)forUNSN08026,and1925to1975°F(1052to1079°C)forUNS
imperfections.
N08024.
11. Sampling
6. Chemical Composition
11.1 Lot:
6.1 The material shall conform to the requirements as to
11.1.1 A lot for chemical analysis shall consist of one heat.
chemical composition prescribed in Table 1.
11.1.2 A lot for mechanical properties shall consist of all
6.2 If a product (check) analysis is performed by the
material from the same heat, nominal diameter or thickness, of
purchaser, the material shall conform to the product (check)
each heat-treatment charge.
analysis variations prescribed in Specification B880.
11.2 Test Material Selection:
11.2.1 Chemical Analysis—Representative samples shall be
7. Condition
taken during pouring or subsequent processing.
7.1 Bars shall be furnished annealed and either hot finished
11.2.1.1 Check analysis shall be wholly the responsibility of
or cold finished. Strain-hardened material is available only as
the purchaser.
cold finished.
11.2.2 Mechanical Properties—Samples of the material to
7.2 Wire will be furnished only as annealed and cold provide test specimens shall be taken from such locations in
finished. each lot as to be representative of that lot.
B473−07 (2018)
TABLE 3 Permissible Variations in Size of Hot-Rolled Round and Square Bars
A
Permissible Variations from Specified Size, in. (mm) Out-of-Round or
B
Out-of-Square,
Over Under
in. (mm)
1 5 C,DE E E
⁄4 (6.35) to ⁄16 (7.94), incl
C,D
5 7
Over ⁄16 (7.94) to ⁄16 (11.11), incl 0.006 (0.15) 0.006 (0.15) 0.009 (0.23)
C,D
7 5
Over ⁄16 (11.11) to ⁄8 (15.88), incl 0.007 (0.18) 0.007 (0.18) 0.010 (0.25)
5 7
Over ⁄8 (15.88) to ⁄8 (22.22), incl 0.008 (0.20) 0.008 (0.20) 0.012 (0.30)
Over ⁄8 (22.22) to 1 (25.40), incl 0.009 (0.23) 0.009 (0.23) 0.013 (0.33)
Over 1 (25.40) to 1 ⁄8 (28.58), incl 0.010 (0.25) 0.010 (0.25) 0.015 (0.38)
1 1
Over 1 ⁄8 (28.58) to 1 ⁄4 (31.75), incl 0.011 (0.28) 0.011 (0.28) 0.016 (0.41)
1 3
Over 1 ⁄4 (31.75) to 1 ⁄8 (34.92), incl 0.012 (0.30) 0.012 (0.30) 0.018 (0.46)
3 1
Over 1 ⁄8 (34.92) to 1 ⁄2 (38.10), incl 0.014 (0.36) 0.014 (0.36) 0.021 (0.53)
1 1 1
Over 1 ⁄2 (38.10) to 2 (50.80), incl ⁄64 (0.40) ⁄64 (0.40) 0.023 (0.58)
1 1
Over 2 (50.80) to 2 ⁄2 (63.50), incl ⁄32 (0.79) 0 0.023 (0.58)
1 1 3
Over 2 ⁄2 (63.50) to 3 ⁄2 (88.90), incl ⁄64 (1.19) 0 0.035 (0.89)
1 1 1
Over 3 ⁄2 (88.90) to 4 ⁄2 (114.30), incl ⁄16 (1.59) 0 0.046 (1.17)
1 1 5
Over 4 ⁄2 (114.30) to 5 ⁄2 (139.70), incl ⁄64 (1.98) 0 0.058 (1.47)
1 1 1
Over 5 ⁄2 (139.70) to 6 ⁄2 (165.10), incl ⁄8 (3.18) 0 0.070 (1.78)
1 5
Over 6 ⁄2 (165.10) to 8 (203.20), incl ⁄32 (3.97) 0 0.085 (2.18)
A
Out-of-round is the difference between the maximum and minimum diameters of the bar, measured at the same cross section.
B
Out-of-square section is the difference in the two dimensions at the same cross section of a square bar, each dimension being the distance between opposite faces.
C
1 5
Size tolerances have not been evolved for rounds in the size range of ⁄4 to ⁄16 in. (6.35 to 7.94 mm), inclusive. Size tolerances have not been evolved for round sections
1 5
in the size range of ⁄4 in. to approximately ⁄8 in. (6.35 to 15.88 mm) in diameter which are produced on rod mills in coils.
D
Variations in size of coiled product made on rod mills are greater than size tolerances for product made on bar mills.
E
Squares in this size are not produced as hot-rolled products.
TABLE 4 Permissible Variations in Size of Hot-Rolled Hexagonal and Octagonal Bars
Maximum Difference in
Permissible Variations from Specified Size, in. (mm)
Specified Sizes Measured
3 Measurements for
Between Opposite Sides,
Hexagons
in. (mm) Over Under
only, in. (mm)
1 1
⁄4 (6.35) to ⁄2 (12.70), incl 0.007 (0.18) 0.007 (0.18) 0.011 (0.28)
Over ⁄2 (12.70) to 1 (25.40), incl 0.010 (0.25) 0.010 (0.25) 0.015 (0.38)
Over 1 (25.40) to 1 ⁄2 (38.10), incl 0.021 (0.53) 0.021 (0.53) 0.025 (0.64)
1 1 1 1
Over 1 ⁄2 (38.10) to 2 (50.80), incl ⁄32 (0.79) ⁄32 (0.79) ⁄32 (0.79)
1 3 3 3
Over 2 (50.80) to 2 ⁄2 (63.50), incl ⁄64 (1.19) ⁄64 (1.19) ⁄64 (1.19)
1 1 1 1 1
Over 2 ⁄2 (63.50) to 3 ⁄2 (88.90), incl ⁄16 (1.59) ⁄16 (1.59) ⁄16 (1.59)
TABLE 5 Permissible Variations in Thickness and Width for Hot-Rolled Flat Bars
Permissible Variations in Thickness for Thicknesses Given, in. (mm)
1 1 1
Specified Width, in. (mm) ⁄8 (3.18) to ⁄2 (12.70), incl Over ⁄2 (12.70) to 1 (25.40), incl Over 1 (25.40) to 2 (50.80), incl
Over Under Over Under Over Under
To 1 (25.40), incl 0.008 (0.20) 0.008 (0.20) 0.010 (0.25) 0.010 (0.25) . .
Over 1 (25.40) to 2 (50.80), incl 0.012 (0.30) 0.012 (0.30) 0.015 (0.38) 0.015 (0.38) 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl 0.015 (0.38) 0.015 (0.38) 0.020 (0.51) 0.020 (0.51) 0.031 (0.79) 0.031 (0.79)
Over 4 (101.60) to 6 (152.40), incl 0.015 (0.38) 0.015 (0.38) 0.020 (0.51) 0.020 (0.51) 0.031 (0.79) 0.031 (0.79)
Over 6 (152.40) to 8 (203.20), incl 0.016 (0.41) 0.016 (0.41) 0.025 (0.64) 0.025 (0.64) 0.031 (0.79) 0.031 (0.79)
Over 8 (203.20) to 10 (254.00), incl 0.021 (0.53) 0.021 (0.53) 0.031 (0.79) 0.031 (0.79) 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl Over 4 (101.60) to 6 (152.40), incl Over 6 (152.40) to 8 (203.20), incl
Over Under Over Under Over Under
To 1 (25.40), incl . . . . . .
Over 1 (25.40) to 2 (50.80), incl . . . . . .
Over 2 (50.80) to 4 (101.60), incl 0.062 (1.57) 0.031 (0.79) . . . .
Over 4 (101.60) to 6 (152.40), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) . .
Over 6 (152.40) to 8 (203.20), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) 0.125 (3.18) 0.156 (3.96)
Over 8 (203.20) to 10 (154.00), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) 0.125 (3.18) 0.156 (3.96)
Permissible Variations in Width, in. (mm)
Specified Width, in. (mm)
Over Under
To 1 (25.40), incl 0.015 (0.38) 0.015 (0.38)
Over 1 (25.40) to 2 (50.80), incl 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl 0.062 (1.57) 0.031 (0.79)
Over 4 (101.60) to 6 (152.40), incl 0.093 (2.36) 0.062 (1.57)
Over 6 (152.40) to 8 (203.20), incl 0.125 (3.18) 0.156 (3.96)
Over 8 (203.20) to 10 (254.00), incl 0.156 (3.96) 0.187 (4.75)
B473−07 (2018)
TABLE 6 Permissible Variations in Size of Cold-Finished Round
13. Specimen Preparation
Bars
13.1 Tensiontestspecimensshallbetakenfromthematerial
Permissible Variations from Specified
A,B after final heat treatment, and shall be selected in the longitu-
Specified Size, in. (mm) Size, in. (mm)
Over Under
dinal direction.The tension test specimens shall conform to the
Over ⁄2 (12.70) to 1 (25.40), excl 0.002 (0.05) 0.002 (0.05)
appropriate sections of Test Methods E8/E8M.
1 (25.40) to 1 ⁄2 (38.10), excl 0.0025 (0.06) 0.0025 (0.06)
C
1 ⁄2 (38.10) to 4 (101.60), incl 0.003 (0.08) 0.003 (0.08)
14. Test Methods
A
Unless otherwise specified, size tolerances are over and under as shown in the
14.1 The chemical composition and mechanical properties
above table. When required, however, they may be specified all over and nothing
under, or all under and nothing over, or any combination of over and under, if the
of the material as enumerated in this specification shall, in case
total spread in size tolerance for a specified size is not less than the total spread
of disagreement, be determined in accordance with the follow-
shown in the table.
B
When it is necessary to heat treat or heat treat and pickle after cold finishing, size ing methods:
tolerances are double those shown in the table.
Test ASTM Designations
C
Col
...

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B473 − 07 (Reapproved 2018)
Standard Specification for
UNS N08020, UNS N08024, and UNS N08026 Nickel Alloy
Bar and Wire
This standard is issued under the fixed designation B473; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E8/E8M Test Methods for Tension Testing of Metallic Ma-
2 terials
1.1 This specification covers UNS N08020, UNS N08026,
E1473 Test Methods for Chemical Analysis of Nickel, Co-
and UNS N08024 bar and wire other than required for
balt and High-Temperature Alloys
reforging.
1.2 The values stated in inch-pound units are to be regarded
3. Terminology
as standard. The values given in parentheses are mathematical
3.1 Definitions of Terms Specific to This Standard:
conversions to SI units that are provided for information only
3.1.1 The terms bar and wire as used in this specification are
and are not considered standard.
described as follows:
1.3 This standard does not purport to address all of the
3.1.2 bars, n—hot-finished rounds, squares, octagons, and
safety concerns, if any, associated with its use. It is the
hexagons: ⁄4 in. (6.35 mm) and over in diameter or size.
responsibility of the user of this standard to become familiar
1 1
Hot-finished flats: ⁄4 to 10 in. (254 mm), inclusive, in width, ⁄8
with all hazards including those identified in the appropriate
in. (3.175 mm) and over in thickness. Cold-finished rounds,
Safety Data Sheet (SDS) for this product/material as provided
squares, octagons, hexagons, and shapes: over ⁄2 in. (12.7 mm)
by the manufacturer, to establish appropriate safety, health,
in diameter or size. Cold-finished flats: ⁄8 in. (9.525 mm) and
and environmental practices, and determine the applicability
over in width (see Discussion (1)), ⁄8 in. and over in thickness
of regulatory limitations prior to use.
(see Discussion (2)).
1.4 This international standard was developed in accor-
3.1.2.1 Discussion—(1) Widths less than ⁄8 in. (9.525 mm)
dance with internationally recognized principles on standard-
and thicknesses less than ⁄16 in. (4.75 mm) are generally
ization established in the Decision on Principles for the
described as flat wire.
Development of International Standards, Guides and Recom-
3.1.2.2 Discussion—(2) Thicknesses ⁄8 in. (3.175 mm) to
mendations issued by the World Trade Organization Technical
under ⁄16 in. (4.75 mm) can be cold-rolled strip as well as bar.
Barriers to Trade (TBT) Committee.
3.1.3 wire, n—cold finished only: round, square, octagon,
hexagon, and shape wire, ⁄2 in. (12.7 mm) and under in
2. Referenced Documents
diameter or size. Cold-finished only: flat wire, ⁄16 in. (4.76
2.1 ASTM Standards:
mm) to under ⁄8 in. (9.525 mm) in width, 0.010 in. (0.254 mm)
A262 Practices for Detecting Susceptibility to Intergranular
to under ⁄16 in. in thickness.
Attack in Austenitic Stainless Steels
B880 Specification for General Requirements for Chemical
4. Ordering Information
Check Analysis Limits for Nickel, Nickel Alloys and
4.1 It is the responsibility of the purchaser to specify all
Cobalt Alloys
requirements that are necessary for the safe and satisfactory
performance of material ordered under this specification.
Examples of such requirements include, but are not limited to,
This specification is under the jurisdiction of ASTM Committee B02 on
the following:
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys. 4.1.1 Quantity (weight or number of pieces),
Current edition approved Nov. 1, 2018. Published November 2018. Originally
4.1.2 Name of material or UNS number,
approved in 1968. Last previous edition approved in 2013 as B473 – 07 (2013).
4.1.3 Form (bar or wire),
DOI: 10.1520/B0473-07R18.
4.1.4 Dimensions,
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SB-473 in Section II of that Code.
4.1.5 Condition,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.6 Finish,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.1.7 ASTM designation and year of issue,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.1.8 Inspection (15.1),
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B473 − 07 (2018)
TABLE 1 Chemical Requirements
Composition, %
Element
UNS N08026 UNS N08020 UNS N08024
Carbon, max 0.03 0.07 0.03
Manganese, max 1.00 2.00 1.00
Phosphorus, max 0.03 0.045 0.035
Sulfur, max 0.03 0.035 0.035
Silicon, max 0.50 1.00 0.50
Nickel 33.00 to 37.20 32.00 to 38.00 35.00 to 40.00
Chromium 22.00 to 26.00 19.00 to 21.00 22.50 to 25.00
Molybdenum 5.00 to 6.70 2.00 to 3.00 3.50 to 5.00
Copper 2.00 to 4.00 3.00 to 4.00 0.50 to 1.50
Columbium (Nb) + tantalum . 8 × carbon–1.00 0.15 to 0.35
Nitrogen 0.10 to 0.16 . .
A A A
Iron remainder remainder remainder
A
By difference.
A
TABLE 2 Mechanical Property Requirements
Diameter or
Tensile Strength, min Yield Strength, min
Elongation in 2 in. Reduction of area,
Condition Thickness,
(50.8 mm), min, % min, %
ksi MPa ksi MPa
in. (mm)
B
Annealed, hot finished or cold All 80 551 35 241 30.0 50.0
finished
Annealed, strain-hardened Up to 2 (50.8) incl 90 620 60 415 15.0 40.0
A
For wire only, tensile strength 90 to 120.0 ksi (620 to 830 MPa); no requirements on yield strength, elongation, and reduction of area.
B
Cold-finished shapes require only 15 %, minimum, elongation.
4.1.9 Supplementary requirements, if any, and 8. Mechanical Properties
4.1.10 If possible, the intended end use.
8.1 The material shall conform to the applicable require-
ments as to mechanical properties prescribed in Table 2.
NOTE 1—A typical ordering description is as follows: 200 bars, UNS
N08020, 1 in. (25.4 mm) round by 10 to 14 ft (3.0 to 3.6 m), centerless
ground, Specification B473.
9. Dimensions and Permissible Variations
9.1 Bar—Bars shall conform to the variations in dimensions
5. Materials and Manufacture
prescribed in Tables 3-11, inclusive, as applicable.
5.1 Heat Treatment—The product of UNS N08020 alloy
9.2 Wire—Wire shall conform to the permissible variations
shall be furnished in the stabilized-annealed condition. The
in dimensions prescribed in Tables 12-16, inclusive, as appli-
product of UNS N08026 alloy shall be furnished in the
cable.
solution-annealed condition. The product of UNS N08024
alloy shall be furnished in the annealed condition.
10. Workmanship, Finish, and Appearance
NOTE 2—The recommended annealing temperatures all followed by
quenching in water or rapidly cooling by other means are as follows: 1700 10.1 The product shall be uniform in quality and condition,
to 1850°F (927 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to
smooth, commercially straight or flat, and free of injurious
1204°C) for UNS N08026, and 1925 to 1975°F (1052 to 1079°C) for UNS
imperfections.
N08024.
11. Sampling
6. Chemical Composition
11.1 Lot:
6.1 The material shall conform to the requirements as to
11.1.1 A lot for chemical analysis shall consist of one heat.
chemical composition prescribed in Table 1.
11.1.2 A lot for mechanical properties shall consist of all
6.2 If a product (check) analysis is performed by the
material from the same heat, nominal diameter or thickness, of
purchaser, the material shall conform to the product (check)
each heat-treatment charge.
analysis variations prescribed in Specification B880.
11.2 Test Material Selection:
11.2.1 Chemical Analysis—Representative samples shall be
7. Condition
taken during pouring or subsequent processing.
7.1 Bars shall be furnished annealed and either hot finished
11.2.1.1 Check analysis shall be wholly the responsibility of
or cold finished. Strain-hardened material is available only as
the purchaser.
cold finished.
11.2.2 Mechanical Properties—Samples of the material to
7.2 Wire will be furnished only as annealed and cold provide test specimens shall be taken from such locations in
finished. each lot as to be representative of that lot.
B473 − 07 (2018)
TABLE 3 Permissible Variations in Size of Hot-Rolled Round and Square Bars
A
Out-of-Round or
Permissible Variations from Specified Size, in. (mm)
B
Out-of-Square,
Over Under in. (mm)
C,D E E E
1 5
⁄4 (6.35) to ⁄16 (7.94), incl
C,D
5 7
Over ⁄16 (7.94) to ⁄16 (11.11), incl 0.006 (0.15) 0.006 (0.15) 0.009 (0.23)
C,D
7 5
Over ⁄16 (11.11) to ⁄8 (15.88), incl 0.007 (0.18) 0.007 (0.18) 0.010 (0.25)
5 7
Over ⁄8 (15.88) to ⁄8 (22.22), incl 0.008 (0.20) 0.008 (0.20) 0.012 (0.30)
Over ⁄8 (22.22) to 1 (25.40), incl 0.009 (0.23) 0.009 (0.23) 0.013 (0.33)
Over 1 (25.40) to 1 ⁄8 (28.58), incl 0.010 (0.25) 0.010 (0.25) 0.015 (0.38)
1 1
Over 1 ⁄8 (28.58) to 1 ⁄4 (31.75), incl 0.011 (0.28) 0.011 (0.28) 0.016 (0.41)
1 3
Over 1 ⁄4 (31.75) to 1 ⁄8 (34.92), incl 0.012 (0.30) 0.012 (0.30) 0.018 (0.46)
3 1
Over 1 ⁄8 (34.92) to 1 ⁄2 (38.10), incl 0.014 (0.36) 0.014 (0.36) 0.021 (0.53)
1 1 1
Over 1 ⁄2 (38.10) to 2 (50.80), incl ⁄64 (0.40) ⁄64 (0.40) 0.023 (0.58)
1 1
Over 2 (50.80) to 2 ⁄2 (63.50), incl ⁄32 (0.79) 0 0.023 (0.58)
1 1 3
Over 2 ⁄2 (63.50) to 3 ⁄2 (88.90), incl ⁄64 (1.19) 0 0.035 (0.89)
1 1 1
Over 3 ⁄2 (88.90) to 4 ⁄2 (114.30), incl ⁄16 (1.59) 0 0.046 (1.17)
1 1 5
Over 4 ⁄2 (114.30) to 5 ⁄2 (139.70), incl ⁄64 (1.98) 0 0.058 (1.47)
1 1 1
Over 5 ⁄2 (139.70) to 6 ⁄2 (165.10), incl ⁄8 (3.18) 0 0.070 (1.78)
1 5
Over 6 ⁄2 (165.10) to 8 (203.20), incl ⁄32 (3.97) 0 0.085 (2.18)
A
Out-of-round is the difference between the maximum and minimum diameters of the bar, measured at the same cross section.
B
Out-of-square section is the difference in the two dimensions at the same cross section of a square bar, each dimension being the distance between opposite faces.
C
1 5
Size tolerances have not been evolved for rounds in the size range of ⁄4 to ⁄16 in. (6.35 to 7.94 mm), inclusive. Size tolerances have not been evolved for round sections
1 5
in the size range of ⁄4 in. to approximately ⁄8 in. (6.35 to 15.88 mm) in diameter which are produced on rod mills in coils.
D
Variations in size of coiled product made on rod mills are greater than size tolerances for product made on bar mills.
E
Squares in this size are not produced as hot-rolled products.
TABLE 4 Permissible Variations in Size of Hot-Rolled Hexagonal and Octagonal Bars
Maximum Difference in
Permissible Variations from Specified Size, in. (mm)
Specified Sizes Measured
3 Measurements for
Between Opposite Sides,
Hexagons
in. (mm)
Over Under
only, in. (mm)
1 1
⁄4 (6.35) to ⁄2 (12.70), incl 0.007 (0.18) 0.007 (0.18) 0.011 (0.28)
Over ⁄2 (12.70) to 1 (25.40), incl 0.010 (0.25) 0.010 (0.25) 0.015 (0.38)
Over 1 (25.40) to 1 ⁄2 (38.10), incl 0.021 (0.53) 0.021 (0.53) 0.025 (0.64)
1 1 1 1
Over 1 ⁄2 (38.10) to 2 (50.80), incl ⁄32 (0.79) ⁄32 (0.79) ⁄32 (0.79)
1 3 3 3
Over 2 (50.80) to 2 ⁄2 (63.50), incl ⁄64 (1.19) ⁄64 (1.19) ⁄64 (1.19)
1 1 1 1 1
Over 2 ⁄2 (63.50) to 3 ⁄2 (88.90), incl ⁄16 (1.59) ⁄16 (1.59) ⁄16 (1.59)
TABLE 5 Permissible Variations in Thickness and Width for Hot-Rolled Flat Bars
Permissible Variations in Thickness for Thicknesses Given, in. (mm)
1 1 1
Specified Width, in. (mm) ⁄8 (3.18) to ⁄2 (12.70), incl Over ⁄2 (12.70) to 1 (25.40), incl Over 1 (25.40) to 2 (50.80), incl
Over Under Over Under Over Under
To 1 (25.40), incl 0.008 (0.20) 0.008 (0.20) 0.010 (0.25) 0.010 (0.25) . .
Over 1 (25.40) to 2 (50.80), incl 0.012 (0.30) 0.012 (0.30) 0.015 (0.38) 0.015 (0.38) 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl 0.015 (0.38) 0.015 (0.38) 0.020 (0.51) 0.020 (0.51) 0.031 (0.79) 0.031 (0.79)
Over 4 (101.60) to 6 (152.40), incl 0.015 (0.38) 0.015 (0.38) 0.020 (0.51) 0.020 (0.51) 0.031 (0.79) 0.031 (0.79)
Over 6 (152.40) to 8 (203.20), incl 0.016 (0.41) 0.016 (0.41) 0.025 (0.64) 0.025 (0.64) 0.031 (0.79) 0.031 (0.79)
Over 8 (203.20) to 10 (254.00), incl 0.021 (0.53) 0.021 (0.53) 0.031 (0.79) 0.031 (0.79) 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl Over 4 (101.60) to 6 (152.40), incl Over 6 (152.40) to 8 (203.20), incl
Over Under Over Under Over Under
To 1 (25.40), incl . . . . . .
Over 1 (25.40) to 2 (50.80), incl . . . . . .
Over 2 (50.80) to 4 (101.60), incl 0.062 (1.57) 0.031 (0.79) . . . .
Over 4 (101.60) to 6 (152.40), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) . .
Over 6 (152.40) to 8 (203.20), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) 0.125 (3.18) 0.156 (3.96)
Over 8 (203.20) to 10 (154.00), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) 0.125 (3.18) 0.156 (3.96)
Permissible Variations in Width, in. (mm)
Specified Width, in. (mm)
Over Under
To 1 (25.40), incl 0.015 (0.38) 0.015 (0.38)
Over 1 (25.40) to 2 (50.80), incl 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl 0.062 (1.57) 0.031 (0.79)
Over 4 (101.60) to 6 (152.40), incl 0.093 (2.36) 0.062 (1.57)
Over 6 (152.40) to 8 (203.20), incl 0.125 (3.18) 0.156 (3.96)
Over 8 (203.20) to 10 (254.00), incl 0.156 (3.96) 0.187 (4.75)
B473 − 07 (2018)
TABLE 6 Permissible Variations in Size of Cold-Finished Round
13. Specimen Preparation
Bars
13.1 Tension test specimens shall be taken from the material
Permissible Variations from Specified
A,B after final heat treatment, and shall be selected in the longitu-
Specified Size, in. (mm) Size, in. (mm)
Over Under dinal direction. The tension test specimens shall conform to the
Over ⁄2 (12.70) to 1 (25.40), excl 0.002 (0.05) 0.002 (0.05)
appropriate sections of Test Methods E8/E8M.
1 (25.40) to 1 ⁄2 (38.10), excl 0.0025 (0.06) 0.0025 (0.06)
C
1 ⁄2 (38.10) to 4 (101.60), incl 0.003 (0.08) 0.003 (0.08)
14. Test Methods
A
Unless otherwise specified, size tolerances are over and under as shown in the
14.1 The chemical composition and mechanical properties
above table. When required, however, they may be specified all over and nothing
under, or all under and nothing over, or any combination of over and under, if the
of the material as enumerated in this specification shall, in case
total spread in size tolerance for a specified size is not less than the total spread
of disagreement, be determined in accordance with the follow-
shown in the table.
B
ing methods:
When it is necessary to heat treat or heat treat and pickle after cold finishing, size
tolerances are double those shown in the table.
Test ASTM Designations
C
Cold-finished bars over 4 in. (101.60 mm) in diameter are
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B473 − 07 (Reapproved 2013) B473 − 07 (Reapproved 2018)
Standard Specification for
UNS N08020, UNS N08024, and UNS N08026 Nickel Alloy
Bar and Wire
This standard is issued under the fixed designation B473; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification covers UNS N08020, UNS N08026, and UNS N08024 bar and wire other than required for reforging.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data
Sheet (MSDS)(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety safety, health, and
healthenvironmental practices, and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
B880 Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
E1473 Test Methods for Chemical Analysis of Nickel, Cobalt and High-Temperature Alloys
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 The terms bar and wire as used in this specification are described as follows:
3.1.2 bars, n—hot-finished rounds, squares, octagons, and hexagons: ⁄4 in. (6.35 mm) and over in diameter or size. Hot-finished
1 1
flats: ⁄4 to 10 in. (254 mm), inclusive, in width, ⁄8 in. (3.175 mm) and over in thickness. Cold-finished rounds, squares, octagons,
1 3
hexagons, and shapes: over ⁄2 in. (12.7 mm) in diameter or size. Cold-finished flats: ⁄8 in. (9.525 mm) and over in width (see
Discussion (1)), ⁄8 in. and over in thickness (see Discussion (2)).
3.1.2.1 Discussion—
3 3
(1) Widths less than ⁄8 in. (9.525 mm) and thicknesses less than ⁄16 in. (4.75 mm) are generally described as flat wire.
3.1.2.2 Discussion—
1 3
(2) Thicknesses ⁄8 in. (3.175 mm) to under ⁄16 in. (4.75 mm) can be cold-rolled strip as well as bar.
This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.07 on Refined
Nickel and Cobalt and Their Alloys.
Current edition approved Oct. 1, 2013Nov. 1, 2018. Published October 2013November 2018. Originally approved in 1968. Last previous edition approved in 20072013
as B473 – 07.B473 – 07 (2013). DOI: 10.1520/B0473-07R13.10.1520/B0473-07R18.
For ASME Boiler and Pressure Vessel Code applications see related Specification SB-473 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B473 − 07 (2018)
3.1.3 wire, n—cold finished only: round, square, octagon, hexagon, and shape wire, ⁄2 in. (12.7 mm) and under in diameter or
3 3 3
size. Cold-finished only: flat wire, ⁄16 in. (4.76 mm) to under ⁄8 in. (9.525 mm) in width, 0.010 in. (0.254 mm) to under ⁄16 in.
in thickness.
4. Ordering Information
4.1 It is the responsibility of the purchaser to specify all requirements that are necessary for the safe and satisfactory
performance of material ordered under this specification. Examples of such requirements include, but are not limited to, the
following:
4.1.1 Quantity (weight or number of pieces),
4.1.2 Name of material or UNS number,
4.1.3 Form (bar or wire),
4.1.4 Dimensions,
4.1.5 Condition,
4.1.6 Finish,
4.1.7 ASTM designation and year of issue,
4.1.8 Inspection (15.1),
4.1.9 Supplementary requirements, if any, and
4.1.10 If possible, the intended end use.
NOTE 1—A typical ordering description is as follows: 200 bars, UNS N08020, 1 in. (25.4 mm) round by 10 to 14 ft (3.0 to 3.6 m), centerless ground,
Specification B473.
5. Materials and Manufacture
5.1 Heat Treatment—The product of UNS N08020 alloy shall be furnished in the stabilized-annealed condition. The product of
UNS N08026 alloy shall be furnished in the solution-annealed condition. The product of UNS N08024 alloy shall be furnished
in the annealed condition.
NOTE 2—The recommended annealing temperatures all followed by quenching in water or rapidly cooling by other means are as follows: 1700 to
1850°F (927 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to 1204°C) for UNS N08026, and 1925 to 1975°F (1052 to 1079°C) for UNS N08024.
6. Chemical Composition
6.1 The material shall conform to the requirements as to chemical composition prescribed in Table 1.
6.2 If a product (check) analysis is performed by the purchaser, the material shall conform to the product (check) analysis
variations prescribed in Specification B880.
7. Condition
7.1 Bars shall be furnished annealed and either hot finished or cold finished. Strain-hardened material is available only as cold
finished.
7.2 Wire will be furnished only as annealed and cold finished.
8. Mechanical Properties
8.1 The material shall conform to the applicable requirements as to mechanical properties prescribed in Table 2.
TABLE 1 Chemical Requirements
Composition, %
Element
UNS N08026 UNS N08020 UNS N08024
Carbon, max 0.03 0.07 0.03
Manganese, max 1.00 2.00 1.00
Phosphorus, max 0.03 0.045 0.035
Sulfur, max 0.03 0.035 0.035
Silicon, max 0.50 1.00 0.50
Nickel 33.00 to 37.20 32.00 to 38.00 35.00 to 40.00
Chromium 22.00 to 26.00 19.00 to 21.00 22.50 to 25.00
Molybdenum 5.00 to 6.70 2.00 to 3.00 3.50 to 5.00
Copper 2.00 to 4.00 3.00 to 4.00 0.50 to 1.50
Columbium (Nb) + tantalum . 8 × carbon–1.00 0.15 to 0.35
Nitrogen 0.10 to 0.16 . .
A A A
Iron remainder remainder remainder
A
By difference.
B473 − 07 (2018)
A
TABLE 2 Mechanical Property Requirements
Diameter or
Tensile Strength, min Yield Strength, min
Elongation in 2 in. Reduction of area,
Condition Thickness,
(50.8 mm), min, % min, %
ksi MPa ksi MPa
in. (mm)
B
Annealed, hot finished or cold All 80 551 35 241 30.0 50.0
finished
Annealed, strain-hardened Up to 2 (50.8) incl 90 620 60 415 15.0 40.0
A
For wire only, tensile strength 90 to 120.0 ksi (620 to 830 MPa); no requirements on yield strength, elongation, and reduction of area.
B
Cold-finished shapes require only 15 %, minimum, elongation.
9. Dimensions and Permissible Variations
9.1 Bar—Bars shall conform to the variations in dimensions prescribed in Tables 3-11, inclusive, as applicable.
9.2 Wire—Wire shall conform to the permissible variations in dimensions prescribed in Tables 12-16, inclusive, as applicable.
10. Workmanship, Finish, and Appearance
10.1 The product shall be uniform in quality and condition, smooth, commercially straight or flat, and free of injurious
imperfections.
11. Sampling
11.1 Lot:
11.1.1 A lot for chemical analysis shall consist of one heat.
11.1.2 A lot for mechanical properties shall consist of all material from the same heat, nominal diameter or thickness, of each
heat-treatment charge.
11.2 Test Material Selection:
11.2.1 Chemical Analysis—Representative samples shall be taken during pouring or subsequent processing.
11.2.1.1 Check analysis shall be wholly the responsibility of the purchaser.
11.2.2 Mechanical Properties—Samples of the material to provide test specimens shall be taken from such locations in each lot
as to be representative of that lot.
12. Number of Tests
12.1 Chemical Analysis—One test per lot.
12.2 Mechanical Properties—One test per lot.
TABLE 3 Permissible Variations in Size of Hot-Rolled Round and Square Bars
A
Permissible Variations from Specified Size, in. (mm) Out-of-Round or
B
Out-of-Square,
Over Under
in. (mm)
C,D E E E
1 5
⁄4 (6.35) to ⁄16 (7.94), incl
C,D
5 7
Over ⁄16 (7.94) to ⁄16 (11.11), incl 0.006 (0.15) 0.006 (0.15) 0.009 (0.23)
7 5 C,D
Over ⁄16 (11.11) to ⁄8 (15.88), incl 0.007 (0.18) 0.007 (0.18) 0.010 (0.25)
5 7
Over ⁄8 (15.88) to ⁄8 (22.22), incl 0.008 (0.20) 0.008 (0.20) 0.012 (0.30)
Over ⁄8 (22.22) to 1 (25.40), incl 0.009 (0.23) 0.009 (0.23) 0.013 (0.33)
Over 1 (25.40) to 1 ⁄8 (28.58), incl 0.010 (0.25) 0.010 (0.25) 0.015 (0.38)
1 1
Over 1 ⁄8 (28.58) to 1 ⁄4 (31.75), incl 0.011 (0.28) 0.011 (0.28) 0.016 (0.41)
1 3
Over 1 ⁄4 (31.75) to 1 ⁄8 (34.92), incl 0.012 (0.30) 0.012 (0.30) 0.018 (0.46)
3 1
Over 1 ⁄8 (34.92) to 1 ⁄2 (38.10), incl 0.014 (0.36) 0.014 (0.36) 0.021 (0.53)
1 1 1
Over 1 ⁄2 (38.10) to 2 (50.80), incl ⁄64 (0.40) ⁄64 (0.40) 0.023 (0.58)
1 1
Over 2 (50.80) to 2 ⁄2 (63.50), incl ⁄32 (0.79) 0 0.023 (0.58)
1 1 3
Over 2 ⁄2 (63.50) to 3 ⁄2 (88.90), incl ⁄64 (1.19) 0 0.035 (0.89)
1 1 1
Over 3 ⁄2 (88.90) to 4 ⁄2 (114.30), incl ⁄16 (1.59) 0 0.046 (1.17)
1 1 5
† Over 4 ⁄2 (114.30) to 5 ⁄2 (139.70), incl ⁄64 (1.98) 0 0.058 (1.47)
1 1 5
Over 4 ⁄2 (114.30) to 5 ⁄2 (139.70), incl ⁄64 (1.98) 0 0.058 (1.47)
1 1 1
Over 5 ⁄2 (139.70) to 6 ⁄2 (165.10), incl ⁄8 (3.18) 0 0.070 (1.78)
1 5
Over 6 ⁄2 (165.10) to 8 (203.20), incl ⁄32 (3.97) 0 0.085 (2.18)
A
Out-of-round is the difference between the maximum and minimum diameters of the bar, measured at the same cross section.
B
Out-of-square section is the difference in the two dimensions at the same cross section of a square bar, each dimension being the distance between opposite faces.
C
1 5
Size tolerances have not been evolved for rounds in the size range of ⁄4 to ⁄16 in. (6.35 to 7.94 mm), inclusive. Size tolerances have not been evolved for round sections
1 5
in the size range of ⁄4 in. to approximately ⁄8 in. (6.35 to 15.88 mm) in diameter which are produced on rod mills in coils.
D
Variations in size of coiled product made on rod mills are greater than size tolerances for product made on bar mills.
E
Squares in this size are not produced as hot-rolled products.
† Editorially corrected.
B473 − 07 (2018)
TABLE 4 Permissible Variations in Size of Hot-Rolled Hexagonal and Octagonal Bars
Maximum Difference in
Permissible Variations from Specified Size, in. (mm)
Specified Sizes Measured
3 Measurements for
Between Opposite Sides,
Hexagons
in. (mm)
Over Under
only, in. (mm)
1 1
⁄4 (6.35) to ⁄2 (12.70), incl 0.007 (0.18) 0.007 (0.18) 0.011 (0.28)
Over ⁄2 (12.70) to 1 (25.40), incl 0.010 (0.25) 0.010 (0.25) 0.015 (0.38)
Over 1 (25.40) to 1 ⁄2 (38.10), incl 0.021 (0.53) 0.021 (0.53) 0.025 (0.64)
1 1 1 1
Over 1 ⁄2 (38.10) to 2 (50.80), incl ⁄32 (0.79) ⁄32 (0.79) ⁄32 (0.79)
1 3 3 3
Over 2 (50.80) to 2 ⁄2 (63.50), incl ⁄64 (1.19) ⁄64 (1.19) ⁄64 (1.19)
1 1 1 1 1
Over 2 ⁄2 (63.50) to 3 ⁄2 (88.90), incl ⁄16 (1.59) ⁄16 (1.59) ⁄16 (1.59)
TABLE 5 Permissible Variations in Thickness and Width for Hot-Rolled Flat Bars
Permissible Variations in Thickness for Thicknesses Given, in. (mm)
1 1 1
Specified Width, in. (mm) ⁄8 (3.18) to ⁄2 (12.70), incl Over ⁄2 (12.70) to 1 (25.40), incl Over 1 (25.40) to 2 (50.80), incl
Over Under Over Under Over Under
To 1 (25.40), incl 0.008 (0.20) 0.008 (0.20) 0.010 (0.25) 0.010 (0.25) . .
Over 1 (25.40) to 2 (50.80), incl 0.012 (0.30) 0.012 (0.30) 0.015 (0.38) 0.015 (0.38) 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl 0.015 (0.38) 0.015 (0.38) 0.020 (0.51) 0.020 (0.51) 0.031 (0.79) 0.031 (0.79)
Over 4 (101.60) to 6 (152.40), incl 0.015 (0.38) 0.015 (0.38) 0.020 (0.51) 0.020 (0.51) 0.031 (0.79) 0.031 (0.79)
Over 6 (152.40) to 8 (203.20), incl 0.016 (0.41) 0.016 (0.41) 0.025 (0.64) 0.025 (0.64) 0.031 (0.79) 0.031 (0.79)
Over 8 (203.20) to 10 (254.00), incl 0.021 (0.53) 0.021 (0.53) 0.031 (0.79) 0.031 (0.79) 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl Over 4 (101.60) to 6 (152.40), incl Over 6 (152.40) to 8 (203.20), incl
Over Under Over Under Over Under
To 1 (25.40), incl . . . . . .
Over 1 (25.40) to 2 (50.80), incl . . . . . .
Over 2 (50.80) to 4 (101.60), incl 0.062 (1.57) 0.031 (0.79) . . . .
Over 4 (101.60) to 6 (152.40), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) . .
Over 6 (152.40) to 8 (203.20), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) 0.125 (3.18) 0.156 (3.96)
Over 8 (203.20) to 10 (154.00), incl 0.062 (1.57) 0.031 (0.79) 0.093 (2.36) 0.062 (1.57) 0.125 (3.18) 0.156 (3.96)
Permissible Variations in Width, in. (mm)
Specified Width, in. (mm)
Over Under
To 1 (25.40), incl 0.015 (0.38) 0.015 (0.38)
Over 1 (25.40) to 2 (50.80), incl 0.031 (0.79) 0.031 (0.79)
Over 2 (50.80) to 4 (101.60), incl 0.062 (1.57) 0.031 (0.79)
Over 4 (101.60) to 6 (152.40), incl 0.093 (2.36) 0.062 (1.57)
Over 6 (152.40) to 8 (203.20), incl 0.125 (3.18) 0.156 (3.96)
Over 8 (203.20) to 10 (254.00), incl 0.156 (3.96) 0.187 (4.75)
TABLE 6 Permissible Variations in Size of Cold-Finished Round
Bars
Permissible Variations from Specified
A,B
Specified Size, in. (mm) Size, in. (mm)
Over Under
Over ⁄2 (12.70) to 1 (25.40), excl 0.002 (0.05) 0.002 (0.05)
1 (25.40) to 1 ⁄2 (38.10), excl 0.0025 (0.06) 0.0025 (0.06)
1 C
1 ⁄2 (38.10) to 4 (101.60), incl 0.003 (0.08) 0.003 (0.08)
A
Unless otherwise specified, size tolerances are over and under as shown in the
above table. When required, however, they may be specified all over and nothing
under, or all under and nothing over, or any combination of over and under, if the
total spread in size tolerance for a specified size is not less than the total spread
shown in the table.
B
When it is necessary to heat treat or heat treat an
...