ASTM B550/B550M-07(2019)

Standard Specification for Zirconium and Zirconium Alloy Bar and Wire

ABSTRACT
This specification covers three grades of zirconium and zirconium alloy bar and wire as grade R60702, unalloyed zirconium; grade R60704, zirconium-tin; and grade R60705, zirconium-niobium. The chemical composition; and mechanical properties requirements, such as tensile strength, yield strength, and elongation; are detailed.
SCOPE
1.1 This specification2 covers three grades of zirconium and zirconium alloy bar and wire.  
1.2 Unless a single unit is used, for example corrosion mass gain in mg/dm2, the values stated in either inch-pound or SI units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore each system must be used independently of the other. SI values cannot be mixed with inch-pound values.  
1.3 The following precautionary caveat pertains only to the test methods portions of this specification.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 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-2019
• ICS: 77.150.99 - Other products of non-ferrous metals
• Technical Committee: B10 - Reactive and Refractory Metals and Alloys
• Drafting Committee: B10.02 - Zirconium and Hafnium

Relations

• Replaced By: ASTM B550/B550M-23 - Standard Specification for Zirconium and Zirconium Alloy Bar and Wire
• Effective Date: 01-Nov-2023
• Refers: ASTM E29-08 - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 01-Oct-2008
• Refers: ASTM E29-06b - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 15-Nov-2006
• Refers: ASTM E29-06a - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 15-Sep-2006
• Refers: ASTM E29-06 - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 01-May-2006
• Refers: ASTM E29-04 - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 01-Dec-2004
• Refers: ASTM E8-04 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 01-Apr-2004
• Refers: ASTM E8-03 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 10-Jul-2003
• Refers: ASTM E29-02e1 - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 10-May-2002
• Refers: ASTM E8-00b - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 10-Oct-2001
• Refers: ASTM E8-01e2 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 10-Oct-2001
• Refers: ASTM E8-01e1 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 10-Oct-2001
• Refers: ASTM E8-01 - Standard Test Methods for Tension Testing of Metallic Materials
• Effective Date: 10-Oct-2001
• Refers: ASTM E29-93a(1999) - Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• Effective Date: 10-May-1999

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:B550/B550M −07(Reapproved 2019)
Standard Specification for
Zirconium and Zirconium Alloy Bar and Wire
This standard is issued under the fixed designation B550/B550M; 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 3.1.1 annealed, n—denotes material that exhibits a recrys-
tallized grain structure.
1.1 This specification covers three grades of zirconium and
zirconium alloy bar and wire. 3.2 Lot Definitions:
3.2.1 bar and wire, n—a lot shall consist of a material of the
1.2 Unless a single unit is used, for example corrosion mass
2 same size, shape, condition, and finish produced from the same
gain in mg/dm , the values stated in either inch-pound or SI
ingot or powder blend by the same reduction schedule and the
units are to be regarded separately as standard. The values
same heat treatment parameters. Unless otherwise agreed
stated in each system are not exact equivalents; therefore each
between manufacturer and purchaser, a lot shall be limited to
system must be used independently of the other. SI values
the product of an 8 h period for final continuous anneal, or to
cannot be mixed with inch-pound values.
a single furnace load for final batch anneal.
1.3 The following precautionary caveat pertains only to the
3.2.2 Forms:
test methods portions of this specification.This standard does
3.2.2.1 bar, n—a hot rolled, forged, or cold worked semi-
not purport to address all of the safety concerns, if any,
finished solid section product whose cross sectional area is
associated with its use. It is the responsibility of the user of this
2 2
equaltoorlessthan16in. [10323mm ];rectangularbarmust
standard to establish appropriate safety, health, and environ-
be less than or equal to 10 in. [254 mm] in width and greater
mental practices and determine the applicability of regulatory
than 0.1875 in. [4.8 mm] in thickness.
limitations prior to use.
3.2.2.2 wire, n—rounds, flats, or special shapes less than or
1.4 This international standard was developed in accor-
equal to 0.1875 in. [4.8 mm] in thickness or major dimension.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Classification
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 4.1 The bar or wire is to be furnished in three grades as
Barriers to Trade (TBT) Committee.
follows:
4.1.1 Grade R60702—Unalloyed zirconium.
2. Referenced Documents
4.1.2 Grade R60704—Zirconium-tin.
4.1.3 Grade R60705—Zirconium-niobium.
2.1 ASTM Standards:
E8 Test Methods for Tension Testing of Metallic Materials
5. Ordering Information
[Metric] E0008_E0008M
E29 Practice for Using Significant Digits in Test Data to
5.1 Orders for material under this specification should
Determine Conformance with Specifications
include the following information:
5.1.1 Quantity (weight or number of pieces),
3. Terminology
5.1.2 Name of material (zirconium bar or wire) (Table 1),
3.1 Definitions of Terms Specific to This Standard: 5.1.3 Grade number (see 4.1),
5.1.4 Standard designation and year of issue, for example
ASTM Specification B550/B550M – 07, and
This specification is under the jurisdiction of ASTM Committee B10 on
5.1.5 Additions to the specification as required.
Reactive and Refractory Metals and Alloys and is the direct responsibility of
Subcommittee B10.02 on Zirconium and Hafnium.
NOTE 1—Atypical ordering description is as follows: 1000 lb [500 kg]
Current edition approved Nov. 1, 2019. Published November 2019. Originally
zirconium cold drawn bar, 0.35 in. [10 mm] in diameter by 10 ft [3 m] in
approved in 1971. Last previous edition approved in 2012 as B550/B550M – 07
length, ASTM B550 – 01, Grade R60702.
(2012). DOI: 10.1520/B0550_B0550M-07R19.
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
6. Materials and Manufacture
cation SB-550 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Bar and wire covered by this specification shall be
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
formed with conventional fabrication methods and equipment
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. found in primary ferrous and nonferrous metal plants.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B550/B550M−07(2019)
TABLE 1 Product Sections and Size
Product Section Size
Bars: Hot-finished round, squares, octagons, and hexagons ⁄4 in. [6.4 mm] and over in diameter or size
1 1
Hot-finished flats ⁄4 in. [6.4 mm] to 10 in. [250 mm], incl, in width, and ⁄8
in. [3.2 mm] and over in thickness
A
Cold-finished rounds, squares, octagons, hexagons, and Over ⁄2 in. [13 mm] in diameter or size
shapes
B
3 1
Cold-finished flats ⁄8 in. [9.5 mm] and over in width, and ⁄8 in. [3.2 mm]
C
and over in thickness
Wire: Cold-finished rounds, squares, octagons, hexagons, and ⁄2 in. [13 mm] and under in diameter or size
shapes
1 3
Cold-finished flats ⁄16 in. [1.6 mm] to under ⁄8 in. [9.5 mm] in width, and
0.010 in. [.25 mm] to under ⁄16 in. [4.8 mm] in
thickness
A 1
Sizes ⁄2 in. [13 mm] and under are wire when in coils, and cut wire when finished in straight lengths.
B
3 3
Widths less than ⁄8 in. [9.5 mm] and thicknesses less than ⁄16 in. [4.8 mm] are generally described as flat wire.
C 1 3
Thickness ⁄8 in. [3.2 mm] to under ⁄16 in. [4.8 mm] can be cold-rolled strip as well as bar.
TABLE 2 Condition
9.1.3 Table 8, Permissible Variations in Sectional Dimen-
Form Condition sions for Cold-Finished Bars in Rounds, Hexagons, Octagons,
Bars hot finished
and Squares.
hot finished and annealed
9.1.4 Table 9, Permissible Variations in Width and Thick-
cold finished
cold finished and annealed ness for Cold-Finished Bars in Flats.
Wire cold finished
9.1.5 Table 10, Permissible Variations in Sectional Dimen-
cold finished and annealed
sions for Wire.
9.1.6 Table 11, Permissible Variations in Thickness and
Width for Cold-Finished Flat Wire.
6.2 The products covered include the sections and sizes
9.1.7 Table 12, Permissible Variations in Length for Hot-
shown in Table 1.
Finished or Cold-Finished Bars.
9.1.8 Table 13, Permissible Variations in Length for Round
6.3 Bar and wire will be supplied in the conditions pre-
and Shape, Straightened and Cut Wire, and Exact Length
scribed in Table 2.
Resheared Wire.
7. Chemical Composition 9.1.9 Table 14, Permissible Variations in Straightness for
Hot- or Cold-Finished Bars.
7.1 The material shall conform to the requirements as to
chemical composition prescribed in Table 3.
10. Workmanship, Finish, and Appearance
7.2 The manufacturer’s ingot analysis shall be considered
10.1 Bars in the hot-finished condition which will conform
thechemicalanalysisforbarandwire,exceptforhydrogenand
to the tolerances prescribed in Tables 6 and 7, shall be
nitrogen, which shall be determined on the finished product.
furnished with one of the following finishes as designated on
7.3 When requested by the purchaser and stated in the
the purchase order:
purchase order, a product analysis for any elements listed in
10.1.1 Not descaled,
Table 3 shall be made on the finished product.
10.1.2 Mechanically descaled,
7.3.1 The manufacturer’s analysis shall be considered as
10.1.3 Mechanically descaled and pickled, and
verified if the check analysis confirms the manufacturer’s
10.1.4 Turned (round bars only).
reported values within the tolerances prescribed in Table 4.
10.2 Bars and wire in cold-finished condition that will
conform to the tolerances prescribed in Tables 8-12, shall be
8. Mechanical Properties
furnished with one of the following finishes as designated on
8.1 Theannealedmaterialshallconformtotherequirements
the purchase order.
for mechanical properties, at room temperature, as prescribed
10.2.1 Cold drawn or cold rolled, or swaged,
in Table 5. Wire supplied for welding applications shall be
10.2.2 Turned (round bars only),
furnished with a temper suitable for uniform feeding in
10.2.3 Centerless ground (round bars only), and
semiautomatic or automatic welding equipment.
10.2.4 Polished (round bars only).
9. Permissible Variations in Dimensions 10.3 Bars or wire shall be free of cracks, seams, slivers,
blisters, burrs, and other injurious imperfections in accordance
9.1 Unless otherwise specified, all bar or wire shall conform
with standards of acceptability agreed upon between the
tothepermissiblevariationsindimensionsprescribedinTables
manufacturer and the purchaser.
6-14, as follows:
9.1.1 Table 6, Dimensional Tolerances for Hot-Finished
11. Significance of Numerical Limits
Rounds, Squares, Octagons, and Hexagons.
9.1.2 Table 7, Dimensional Tolerances in Hot-Rolled Flat 11.1 For the purpose of determining compliance with the
Bars. specified limits for requirements of the properties listed in the
B550/B550M−07(2019)
A
TABLE 3 Chemical Requirements
Composition, %
Element
Grades R60702 Grades R60704 Grades R60705
Zirconium + hafnium, min 99.2 97.5 95.5
Hafnium, max 4.5 4.5 4.5
Iron + chromium 0.2 max 0.2 to 0.4 0.2 max
Tin . 1.0 to 2.0 .
Hydrogen, max 0.005 0.005 0.005
Nitrogen, max 0.025 0.025 0.025
Carbon, max 0.05 0.05 0.05
Niobium . . . . . . 2.0 to 3.0
Oxygen, max 0.16 0.18 0.18
A
By agreement between the purchaser and the manufacturer, analysis may be required and limits established for elements and compounds not specified in the table of
chemical composition.
TABLE 4 Permissible Variation in Check Analysis Between TABLE 7 Dimensional Tolerances in Hot-Rolled Flat Bars
Different Laboratories
A
Variation in
Variation in Width,
Thickness, in. [mm]
in. [mm]
Thickness, in. [mm]
Permissible Variation in
Element
Product Analysis, % 1
Up–0.150 [3.8] +0.020 –0 [+0.5] ⁄8 –0 [3.2]
Over 0.150–0.250 [3.8–6.3] +0.030 –0 [+0.75] ⁄32 –0 [4.0]
Hydrogen 0.002
Over 0.250–0.350 [6.3–8.9] +0.040 –0 [+1.0] ⁄16 –0 [4.8]
Nitrogen 0.01
Over 0.350–0.450 [8.9–11.4] +0.050 –0 [+1.3] ⁄32 –0 [5.6]
Carbon 0.01
B
Over 0.450–0550 [11.4–14] +0.070 –0 [+1.8]
Hafnium 0.1
B
Over 0.550–1.500 [14–38] +0.080 –0 [+2.0]
Iron + chromium 0.025
BB
Over 1.500 [38]
Tin 0.05
Niobium 0.05 A
For bars sheared from plate, width tolerances shall be as follows:
Oxygen 0.02
B
Depends on size and quantity ordered.
Specified Thickness, in. Width Tolerances, in. [mm]
A
TABLE 5 Tensile Requirements
[mm] Over Under
1 1
Over 0.100–0.150 ⁄16 [1.6] ⁄16 [1.6]
Grades
5 5
Over 0.150–0.250 ⁄64 [2.0] ⁄64 [2.0]
R60702 R60704 R60705
3 3
Over 0.250–0.350 ⁄32 [2.4] ⁄32 [2.4]
Tensile Strength, min, ksi (MPa) 55 [380] 60 [415] 80 [550]
7 7
Over 0.350–0.450 ⁄64 [2.8] ⁄64 [2.8]
Yield Strength, min, ksi (MPa) 30 [205] 35 [240] 55 [380]
B 1 1
Over 0.450–0.550 ⁄8 [3.2] ⁄8 [3.2]
Elongation in 2 in. or 50 mm min, % 16 14 16
5 5
Over 0.550–0.650 ⁄32 [4.0] ⁄32 [4.0]
A
For bar only.
B
When a sub-size specimen is used, the gage length shall be as specified inTest
Methods E8 for the specimen.
TABLE 8 Permissible Variations in Sectional Dimensions for
Cold-Finished Bars in Rounds, Hexagons, Octagons, and
Squares
TABLE 6 Dimensional Tolerances for Hot-Finished Rounds,
A
Squares, Octagons, and Hexagons Permissible Variation, in. [mm]
Specified Size, in. [mm]
Over Under
Variation in Out of Round,
Specified Size, in. [mm] Rounds
Size, in. [mm] Out of Square, in. [mm]
Over ⁄2 –1, incl [13–25] 0.002 [0.05] 0.002 [0.05]
Up–0.500 [13] +0.030 –0 [+0.75] 0.025 [0.64] 1
1–1 ⁄2 , excl [25–38] 0.0025 [0.06] 0.0025 [0.06]
B
Over 0.500–1.000 [13–25] +0.050 –0 [+1.3] 0.040 [1] 1
1 ⁄2 –4, incl [38–100] 0.003 [0.08] 0.003 [0.08]
Over 1.000–2.000 [25–50] +0.070 –0 [+1.8] 0.060 [1.5]
Hexagons, Octagons, and Squares
Over 2.000-4.000 [50–100] +0.150 –0 [+3.8] 0.080 [2] 1
Over ⁄2 –1, incl [13–25] 0 0.004 [0.10]
Over 4.000–6.000 [100–150] +0.250 –0 [+6.4] 0.100 [2.5]
Over 1–2, excl [25–50] 0 0.006 [0.15]
Over 2–3, incl [50–75] 0 0.008 [0.20]
Over 3 [75] 0 0.010 [0.25]
A
When it is necessary to heat treat or heat treat and pickle after cold finishing,
following table, an observed value or a calculated value shall
becauseofspecialhardnessormechanicalpropertyrequirements,tolerancesare
double those shown in the table.
be rounded as indicated in accordance with the rounding
B
For permissible variations on sizes over 4 in. [100 mm] the manufacturer should
methods of Practice E29.
be consulted.
Rounded Unit for Observed or
Property Calculated Value
Chemical composition and tolerances nearest unit in the last right-hand place
12.3 Retests:
(when expressed as decimals) of figures of the specified limit
Tensile strength and yield strength nearest 1000 psi (10 MPa)
12.3.1 If any sample or specimen exhibits obvious surface
Elongation nearest 1 %
contamination or improper preparation disqualifying it as a
truly representative sample, it shall be discarded and a new
12. Number of Tests and Retests
sample or specimen substituted.
12.1 One longitudinal tension test shall be made from each
12.3.2 If the results of any tests of any lot do not conform to
lot of bar and rod, see 13.1.
the requirements specified, retests shall be made on additional
12.2 One chemistry test for hydrogen and nitrogen content samples from the same lot, each of which shall conform to the
shall be made from each lot of finished product, see 13.2. requirements specified.
B550/B550M−07(2019)
TABLE 9 Permissible Variations in Width and Thickness for Cold-
14. Inspection
Finished Bars in Flats
14.1 The manufacturer shall inspect the material covered by
Permissible Variations in Width for
this specification prior to shipment. If so specified in the
Thicknesses Given, Over and Under,
Width, in. [mm]
A
in. [mm]
purchaseorder,thepurchaserorhisrepresentativemaywitness
1 1
⁄4 [6.4] and under Over ⁄4 [6.4]
the testing and inspection of the material at the place of
Width
3 manufacture. In such cases the purchaser shall state in his
⁄8 –1, incl 0.004 [0.10] 0.002 [0.05]
Over 1–2, incl 0.006 [0.15] 0.003 [0.08]
purchase order which tests he desires to witness. The manu-
Over 2–3, incl 0.008 [0.20] 0.004 [0.10]
facturer shall give ample notice to the purchaser as to the time
B
Over 3–4 ⁄2, incl 0.010 [0.25] 0.005 [0.13]
and place of the designated tests. If the purchaser’s represen-
Thickne
...

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: B550/B550M − 07 (Reapproved 2019)
Standard Specification for
Zirconium and Zirconium Alloy Bar and Wire
This standard is issued under the fixed designation B550/B550M; 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 3.1.1 annealed, n—denotes material that exhibits a recrys-
2 tallized grain structure.
1.1 This specification covers three grades of zirconium and
zirconium alloy bar and wire. 3.2 Lot Definitions:
3.2.1 bar and wire, n—a lot shall consist of a material of the
1.2 Unless a single unit is used, for example corrosion mass
2 same size, shape, condition, and finish produced from the same
gain in mg/dm , the values stated in either inch-pound or SI
ingot or powder blend by the same reduction schedule and the
units are to be regarded separately as standard. The values
same heat treatment parameters. Unless otherwise agreed
stated in each system are not exact equivalents; therefore each
between manufacturer and purchaser, a lot shall be limited to
system must be used independently of the other. SI values
the product of an 8 h period for final continuous anneal, or to
cannot be mixed with inch-pound values.
a single furnace load for final batch anneal.
1.3 The following precautionary caveat pertains only to the
3.2.2 Forms:
test methods portions of this specification.This standard does
3.2.2.1 bar, n—a hot rolled, forged, or cold worked semi-
not purport to address all of the safety concerns, if any,
finished solid section product whose cross sectional area is
associated with its use. It is the responsibility of the user of this
2 2
equal to or less than 16 in. [10 323 mm ]; rectangular bar must
standard to establish appropriate safety, health, and environ-
be less than or equal to 10 in. [254 mm] in width and greater
mental practices and determine the applicability of regulatory
than 0.1875 in. [4.8 mm] in thickness.
limitations prior to use.
3.2.2.2 wire, n—rounds, flats, or special shapes less than or
1.4 This international standard was developed in accor-
equal to 0.1875 in. [4.8 mm] in thickness or major dimension.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Classification
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4.1 The bar or wire is to be furnished in three grades as
Barriers to Trade (TBT) Committee.
follows:
4.1.1 Grade R60702—Unalloyed zirconium.
2. Referenced Documents
4.1.2 Grade R60704—Zirconium-tin.
2.1 ASTM Standards: 4.1.3 Grade R60705—Zirconium-niobium.
E8 Test Methods for Tension Testing of Metallic Materials
5. Ordering Information
[Metric] E0008_E0008M
E29 Practice for Using Significant Digits in Test Data to
5.1 Orders for material under this specification should
Determine Conformance with Specifications
include the following information:
5.1.1 Quantity (weight or number of pieces),
3. Terminology
5.1.2 Name of material (zirconium bar or wire) (Table 1),
3.1 Definitions of Terms Specific to This Standard: 5.1.3 Grade number (see 4.1),
5.1.4 Standard designation and year of issue, for example
ASTM Specification B550/B550M – 07, and
This specification is under the jurisdiction of ASTM Committee B10 on
5.1.5 Additions to the specification as required.
Reactive and Refractory Metals and Alloys and is the direct responsibility of
Subcommittee B10.02 on Zirconium and Hafnium.
NOTE 1—A typical ordering description is as follows: 1000 lb [500 kg]
Current edition approved Nov. 1, 2019. Published November 2019. Originally
zirconium cold drawn bar, 0.35 in. [10 mm] in diameter by 10 ft [3 m] in
approved in 1971. Last previous edition approved in 2012 as B550/B550M – 07
length, ASTM B550 – 01, Grade R60702.
(2012). DOI: 10.1520/B0550_B0550M-07R19.
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
6. Materials and Manufacture
cation SB-550 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Bar and wire covered by this specification shall be
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
formed with conventional fabrication methods and equipment
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. found in primary ferrous and nonferrous metal plants.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B550/B550M − 07 (2019)
TABLE 1 Product Sections and Size
Product Section Size
Bars: Hot-finished round, squares, octagons, and hexagons ⁄4 in. [6.4 mm] and over in diameter or size
1 1
Hot-finished flats ⁄4 in. [6.4 mm] to 10 in. [250 mm], incl, in width, and ⁄8
in. [3.2 mm] and over in thickness
A
Cold-finished rounds, squares, octagons, hexagons, and Over ⁄2 in. [13 mm] in diameter or size
shapes
B
3 1
Cold-finished flats ⁄8 in. [9.5 mm] and over in width, and ⁄8 in. [3.2 mm]
C
and over in thickness
Wire: Cold-finished rounds, squares, octagons, hexagons, and ⁄2 in. [13 mm] and under in diameter or size
shapes
1 3
Cold-finished flats ⁄16 in. [1.6 mm] to under ⁄8 in. [9.5 mm] in width, and
0.010 in. [.25 mm] to under ⁄16 in. [4.8 mm] in
thickness
A
Sizes ⁄2 in. [13 mm] and under are wire when in coils, and cut wire when finished in straight lengths.
B 3 3
Widths less than ⁄8 in. [9.5 mm] and thicknesses less than ⁄16 in. [4.8 mm] are generally described as flat wire.
C
1 3
Thickness ⁄8 in. [3.2 mm] to under ⁄16 in. [4.8 mm] can be cold-rolled strip as well as bar.
TABLE 2 Condition
9.1.3 Table 8, Permissible Variations in Sectional Dimen-
Form Condition sions for Cold-Finished Bars in Rounds, Hexagons, Octagons,
Bars hot finished
and Squares.
hot finished and annealed
9.1.4 Table 9, Permissible Variations in Width and Thick-
cold finished
cold finished and annealed ness for Cold-Finished Bars in Flats.
Wire cold finished
9.1.5 Table 10, Permissible Variations in Sectional Dimen-
cold finished and annealed
sions for Wire.
9.1.6 Table 11, Permissible Variations in Thickness and
Width for Cold-Finished Flat Wire.
6.2 The products covered include the sections and sizes
9.1.7 Table 12, Permissible Variations in Length for Hot-
shown in Table 1.
Finished or Cold-Finished Bars.
9.1.8 Table 13, Permissible Variations in Length for Round
6.3 Bar and wire will be supplied in the conditions pre-
and Shape, Straightened and Cut Wire, and Exact Length
scribed in Table 2.
Resheared Wire.
7. Chemical Composition 9.1.9 Table 14, Permissible Variations in Straightness for
Hot- or Cold-Finished Bars.
7.1 The material shall conform to the requirements as to
chemical composition prescribed in Table 3.
10. Workmanship, Finish, and Appearance
7.2 The manufacturer’s ingot analysis shall be considered
10.1 Bars in the hot-finished condition which will conform
the chemical analysis for bar and wire, except for hydrogen and
to the tolerances prescribed in Tables 6 and 7, shall be
nitrogen, which shall be determined on the finished product.
furnished with one of the following finishes as designated on
7.3 When requested by the purchaser and stated in the
the purchase order:
purchase order, a product analysis for any elements listed in
10.1.1 Not descaled,
Table 3 shall be made on the finished product.
10.1.2 Mechanically descaled,
7.3.1 The manufacturer’s analysis shall be considered as
10.1.3 Mechanically descaled and pickled, and
verified if the check analysis confirms the manufacturer’s
10.1.4 Turned (round bars only).
reported values within the tolerances prescribed in Table 4.
10.2 Bars and wire in cold-finished condition that will
conform to the tolerances prescribed in Tables 8-12, shall be
8. Mechanical Properties
furnished with one of the following finishes as designated on
8.1 The annealed material shall conform to the requirements
the purchase order.
for mechanical properties, at room temperature, as prescribed
10.2.1 Cold drawn or cold rolled, or swaged,
in Table 5. Wire supplied for welding applications shall be
10.2.2 Turned (round bars only),
furnished with a temper suitable for uniform feeding in
10.2.3 Centerless ground (round bars only), and
semiautomatic or automatic welding equipment.
10.2.4 Polished (round bars only).
9. Permissible Variations in Dimensions
10.3 Bars or wire shall be free of cracks, seams, slivers,
blisters, burrs, and other injurious imperfections in accordance
9.1 Unless otherwise specified, all bar or wire shall conform
with standards of acceptability agreed upon between the
to the permissible variations in dimensions prescribed in Tables
manufacturer and the purchaser.
6-14, as follows:
9.1.1 Table 6, Dimensional Tolerances for Hot-Finished
11. Significance of Numerical Limits
Rounds, Squares, Octagons, and Hexagons.
9.1.2 Table 7, Dimensional Tolerances in Hot-Rolled Flat 11.1 For the purpose of determining compliance with the
Bars. specified limits for requirements of the properties listed in the
B550/B550M − 07 (2019)
A
TABLE 3 Chemical Requirements
Composition, %
Element
Grades R60702 Grades R60704 Grades R60705
Zirconium + hafnium, min 99.2 97.5 95.5
Hafnium, max 4.5 4.5 4.5
Iron + chromium 0.2 max 0.2 to 0.4 0.2 max
Tin . . . 1.0 to 2.0 . . .
Hydrogen, max 0.005 0.005 0.005
Nitrogen, max 0.025 0.025 0.025
Carbon, max 0.05 0.05 0.05
Niobium . . . . . . 2.0 to 3.0
Oxygen, max 0.16 0.18 0.18
A
By agreement between the purchaser and the manufacturer, analysis may be required and limits established for elements and compounds not specified in the table of
chemical composition.
TABLE 4 Permissible Variation in Check Analysis Between TABLE 7 Dimensional Tolerances in Hot-Rolled Flat Bars
Different Laboratories
A
Variation in
Variation in Width,
Thickness, in. [mm]
in. [mm]
Thickness, in. [mm]
Permissible Variation in
Element
Product Analysis, % 1
Up–0.150 [3.8] +0.020 –0 [+0.5] ⁄8 –0 [3.2]
Over 0.150–0.250 [3.8–6.3] +0.030 –0 [+0.75] ⁄32 –0 [4.0]
Hydrogen 0.002
Over 0.250–0.350 [6.3–8.9] +0.040 –0 [+1.0] ⁄16 –0 [4.8]
Nitrogen 0.01
Over 0.350–0.450 [8.9–11.4] +0.050 –0 [+1.3] ⁄32 –0 [5.6]
Carbon 0.01
B
Hafnium 0.1 Over 0.450–0550 [11.4–14] +0.070 –0 [+1.8]
B
Over 0.550–1.500 [14–38] +0.080 –0 [+2.0]
Iron + chromium 0.025
B B
Over 1.500 [38]
Tin 0.05
Niobium 0.05
A
For bars sheared from plate, width tolerances shall be as follows:
Oxygen 0.02 B
Depends on size and quantity ordered.
Specified Thickness, in. Width Tolerances, in. [mm]
A
TABLE 5 Tensile Requirements
[mm] Over Under
1 1
Over 0.100–0.150 ⁄16 [1.6] ⁄16 [1.6]
Grades
5 5
Over 0.150–0.250 ⁄64 [2.0] ⁄64 [2.0]
R60702 R60704 R60705
3 3
Over 0.250–0.350 ⁄32 [2.4] ⁄32 [2.4]
Tensile Strength, min, ksi (MPa) 55 [380] 60 [415] 80 [550]
7 7
Over 0.350–0.450 ⁄64 [2.8] ⁄64 [2.8]
Yield Strength, min, ksi (MPa) 30 [205] 35 [240] 55 [380]
B 1 1
Over 0.450–0.550 ⁄8 [3.2] ⁄8 [3.2]
Elongation in 2 in. or 50 mm min, % 16 14 16
5 5
Over 0.550–0.650 ⁄32 [4.0] ⁄32 [4.0]
A
For bar only.
B
When a sub-size specimen is used, the gage length shall be as specified in Test
Methods E8 for the specimen.
TABLE 8 Permissible Variations in Sectional Dimensions for
Cold-Finished Bars in Rounds, Hexagons, Octagons, and
Squares
TABLE 6 Dimensional Tolerances for Hot-Finished Rounds,
A
Squares, Octagons, and Hexagons
Permissible Variation, in. [mm]
Specified Size, in. [mm]
Over Under
Variation in Out of Round,
Specified Size, in. [mm]
Rounds
Size, in. [mm] Out of Square, in. [mm]
Over ⁄2 –1, incl [13–25] 0.002 [0.05] 0.002 [0.05]
Up–0.500 [13] +0.030 –0 [+0.75] 0.025 [0.64] 1
1–1 ⁄2 , excl [25–38] 0.0025 [0.06] 0.0025 [0.06]
B
Over 0.500–1.000 [13–25] +0.050 –0 [+1.3] 0.040 [1] 1
1 ⁄2 –4, incl [38–100] 0.003 [0.08] 0.003 [0.08]
Over 1.000–2.000 [25–50] +0.070 –0 [+1.8] 0.060 [1.5]
Hexagons, Octagons, and Squares
Over 2.000-4.000 [50–100] +0.150 –0 [+3.8] 0.080 [2] 1
Over ⁄2 –1, incl [13–25] 0 0.004 [0.10]
Over 4.000–6.000 [100–150] +0.250 –0 [+6.4] 0.100 [2.5]
Over 1–2, excl [25–50] 0 0.006 [0.15]
Over 2–3, incl [50–75] 0 0.008 [0.20]
Over 3 [75] 0 0.010 [0.25]
A
When it is necessary to heat treat or heat treat and pickle after cold finishing,
following table, an observed value or a calculated value shall
because of special hardness or mechanical property requirements, tolerances are
double those shown in the table.
be rounded as indicated in accordance with the rounding
B
For permissible variations on sizes over 4 in. [100 mm] the manufacturer should
methods of Practice E29.
be consulted.
Rounded Unit for Observed or
Property Calculated Value
Chemical composition and tolerances nearest unit in the last right-hand place
12.3 Retests:
(when expressed as decimals) of figures of the specified limit
Tensile strength and yield strength nearest 1000 psi (10 MPa)
12.3.1 If any sample or specimen exhibits obvious surface
Elongation nearest 1 %
contamination or improper preparation disqualifying it as a
truly representative sample, it shall be discarded and a new
12. Number of Tests and Retests
sample or specimen substituted.
12.1 One longitudinal tension test shall be made from each
12.3.2 If the results of any tests of any lot do not conform to
lot of bar and rod, see 13.1.
the requirements specified, retests shall be made on additional
12.2 One chemistry test for hydrogen and nitrogen content samples from the same lot, each of which shall conform to the
shall be made from each lot of finished product, see 13.2. requirements specified.
B550/B550M − 07 (2019)
TABLE 9 Permissible Variations in Width and Thickness for Cold-
14. Inspection
Finished Bars in Flats
14.1 The manufacturer shall inspect the material covered by
Permissible Variations in Width for
this specification prior to shipment. If so specified in the
Thicknesses Given, Over and Under,
Width, in. [mm]
A
in. [mm] purchase order, the purchaser or his representative may witness
1 1
⁄4 [6.4] and under Over ⁄4 [6.4]
the testing and inspection of the material at the place of
Width
manufacture. In such cases the purchaser shall state in his
⁄8 –1, incl 0.004 [0.10] 0.002 [0.05]
Over 1–2, incl 0.006 [0.15] 0.003 [0.08]
purchase order which tests he desires to witness. The manu-
Over 2–3, incl 0.008 [0.20] 0.004 [0.10]
facturer shall give ample notice to the purchaser as to the time
B
Over 3–4 ⁄2, incl 0.010 [0.25] 0.005 [0.13]
and place of the designated tests. If the purchaser’s represen-
Thickness
Permissible Variatio
...

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: B550/B550M − 07 (Reapproved 2012) B550/B550M − 07 (Reapproved 2019)
Standard Specification for
Zirconium and Zirconium Alloy Bar and Wire
This standard is issued under the fixed designation B550/B550M; 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 three grades of zirconium and zirconium alloy bar and wire.
1.2 Unless a single unit is used, for example corrosion mass gain in mg/dm , the values stated in either inch-pound or SI units
are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore each system must
be used independently of the other. SI values cannot be mixed with inch-pound values.
1.3 The following precautionary caveat pertains only to the test methods portions of this specification.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
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:
E8 Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 annealed, n—denotes material that exhibits a recrystallized grain structure.
3.2 Lot Definitions:
3.2.1 bar and wire, n—a lot shall consist of a material of the same size, shape, condition, and finish produced from the same
ingot or powder blend by the same reduction schedule and the same heat treatment parameters. Unless otherwise agreed between
manufacturer and purchaser, a lot shall be limited to the product of an 8 h period for final continuous anneal, or to a single furnace
load for final batch anneal.
3.2.2 Forms:
3.2.2.1 bar, n—a hot rolled, forged, or cold worked semifinished solid section product whose cross sectional area is equal to or
2 2
less than 16 in. [10 323 mm ]; rectangular bar must be less than or equal to 10 in. [254 mm] in width and greater than 0.1875
in. [4.8 mm] in thickness.
3.2.2.2 wire, n—rounds, flats, or special shapes less than or equal to 0.1875 in. [4.8 mm] in thickness or major dimension.
4. Classification
4.1 The bar or wire is to be furnished in three grades as follows:
4.1.1 Grade R60702—Unalloyed zirconium.
4.1.2 Grade R60704—Zirconium-tin.
This specification is under the jurisdiction of ASTM Committee B10 on Reactive and Refractory Metals and Alloys and is the direct responsibility of Subcommittee
B10.02 on Zirconium and Hafnium.
Current edition approved May 1, 2012Nov. 1, 2019. Published May 2012November 2019. Originally approved in 1971. Last previous edition approved in 20072012 as
B550/B550M – 07.B550/B550M – 07 (2012). DOI: 10.1520/B0550_B0550M-07R12.10.1520/B0550_B0550M-07R19.
For ASME Boiler and Pressure Vessel Code applications, see related Specification SB-550 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’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B550/B550M − 07 (2019)
4.1.3 Grade R60705—Zirconium-niobium.
5. Ordering Information
5.1 Orders for material under this specification should include the following information:
5.1.1 Quantity (weight or number of pieces),
5.1.2 Name of material (zirconium bar or wire) (Table 1),
5.1.3 Grade number (see 4.1),
5.1.4 Standard designation and year of issue, for example ASTM Specification B550/B550M- 07, and
5.1.5 Additions to the specification as required.
NOTE 1—A typical ordering description is as follows: 1000 lb [500 kg] zirconium cold drawn bar, 0.35 in. [10 mm] in diameter by 10 ft [3 m] in length,
ASTM B550 - 01, Grade R60702.
6. Materials and Manufacture
6.1 Bar and wire covered by this specification shall be formed with conventional fabrication methods and equipment found in
primary ferrous and nonferrous metal plants.
6.2 The products covered include the sections and sizes shown in Table 1.
6.3 Bar and wire will be supplied in the conditions prescribed in Table 2.
7. Chemical Composition
7.1 The material shall conform to the requirements as to chemical composition prescribed in Table 3.
7.2 The manufacturer’s ingot analysis shall be considered the chemical analysis for bar and wire, except for hydrogen and
nitrogen, which shall be determined on the finished product.
7.3 When requested by the purchaser and stated in the purchase order, a product analysis for any elements listed in Table 3 shall
be made on the finished product.
7.3.1 The manufacturer’s analysis shall be considered as verified if the check analysis confirms the manufacturer’s reported
values within the tolerances prescribed in Table 4.
8. Mechanical Properties
8.1 The annealed material shall conform to the requirements for mechanical properties, at room temperature, as prescribed in
Table 5. Wire supplied for welding applications shall be furnished with a temper suitable for uniform feeding in semiautomatic
or automatic welding equipment.
9. Permissible Variations in Dimensions
9.1 Unless otherwise specified, all bar or wire shall conform to the permissible variations in dimensions prescribed in Tables
6-14, as follows:
9.1.1 Table 6, Dimensional Tolerances for Hot-Finished Rounds, Squares, Octagons, and Hexagons.
9.1.2 Table 7, Dimensional Tolerances in Hot-Rolled Flat Bars.
9.1.3 Table 8, Permissible Variations in Sectional Dimensions for Cold-Finished Bars in Rounds, Hexagons, Octagons, and
Squares.
9.1.4 Table 9, Permissible Variations in Width and Thickness for Cold-Finished Bars in Flats.
9.1.5 Table 10, Permissible Variations in Sectional Dimensions for Wire.
TABLE 1 Product Sections and Size
Product Section Size
Bars: Hot-finished round, squares, octagons, and hexagons ⁄4 in. [6.4 mm] and over in diameter or size
1 1
Hot-finished flats ⁄4 in. [6.4 mm] to 10 in. [250 mm], incl, in width, and ⁄8
in. [3.2 mm] and over in thickness
A
Cold-finished rounds, squares, octagons, hexagons, and Over ⁄2 in. [13 mm] in diameter or size
shapes
B
3 1
Cold-finished flats ⁄8 in. [9.5 mm] and over in width, and ⁄8 in. [3.2 mm]
C
and over in thickness
Wire: Cold-finished rounds, squares, octagons, hexagons, and ⁄2 in. [13 mm] and under in diameter or size
shapes
1 3
Cold-finished flats ⁄16 in. [1.6 mm] to under ⁄8 in. [9.5 mm] in width, and
0.010 in. [.25 mm] to under ⁄16 in. [4.8 mm] in
thickness
A
Sizes ⁄2 in. [13 mm] and under are wire when in coils, and cut wire when finished in straight lengths.
B 3 3
Widths less than ⁄8 in. [9.5 mm] and thicknesses less than ⁄16 in. [4.8 mm] are generally described as flat wire.
C
1 3
Thickness ⁄8 in. [3.2 mm] to under ⁄16 in. [4.8 mm] can be cold-rolled strip as well as bar.
B550/B550M − 07 (2019)
TABLE 2 Condition
Form Condition
Bars hot finished
hot finished and annealed
cold finished
cold finished and annealed
Wire cold finished
cold finished and annealed
9.1.6 Table 11, Permissible Variations in Thickness and Width for Cold-Finished Flat Wire.
9.1.7 Table 12, Permissible Variations in Length for Hot-Finished or Cold-Finished Bars.
9.1.8 Table 13, Permissible Variations in Length for Round and Shape, Straightened and Cut Wire, and Exact Length Resheared
Wire.
9.1.9 Table 14, Permissible Variations in Straightness for Hot- or Cold-Finished Bars.
10. Workmanship, Finish, and Appearance
10.1 Bars in the hot-finished condition which will conform to the tolerances prescribed in Tables 6 and 7, shall be furnished with
one of the following finishes as designated on the purchase order:
10.1.1 Not descaled,
10.1.2 Mechanically descaled,
10.1.3 Mechanically descaled and pickled, and
10.1.4 Turned (round bars only).
10.2 Bars and wire in cold-finished condition that will conform to the tolerances prescribed in Tables 8-12, shall be furnished
with one of the following finishes as designated on the purchase order.
10.2.1 Cold drawn or cold rolled, or swaged,
10.2.2 Turned (round bars only),
10.2.3 Centerless ground (round bars only), and
10.2.4 Polished (round bars only).
10.3 Bars or wire shall be free of cracks, seams, slivers, blisters, burrs, and other injurious imperfections in accordance with
standards of acceptability agreed upon between the manufacturer and the purchaser.
11. Significance of Numerical Limits
11.1 For the purpose of determining compliance with the specified limits for requirements of the properties listed in the
following table, an observed value or a calculated value shall be rounded as indicated in accordance with the rounding methods
of Practice E29.
Rounded Unit for Observed or
Property Calculated Value
Chemical composition and tolerances nearest unit in the last right-hand place
(when expressed as decimals) of figures of the specified limit
Tensile strength and yield strength nearest 1000 psi (10 MPa)
Elongation nearest 1 %
12. Number of Tests and Retests
12.1 One longitudinal tension test shall be made from each lot of bar and rod, see 13.1.
12.2 One chemistry test for hydrogen and nitrogen content shall be made from each lot of finished product, see 13.2.
12.3 Retests:
12.3.1 If any sample or specimen exhibits obvious surface contamination or improper preparation disqualifying it as a truly
representative sample, it shall be discarded and a new sample or specimen substituted.
12.3.2 If the results of any tests of any lot do not conform to the requirements specified, retests shall be made on additional
samples from the same lot, each of which shall conform to the requirements specified.
13. Test Methods
13.1 Tension Tests—The tension test shall be conducted in accordance with Test Methods E8. Determine the yield strength by
the offset (0.2 %) method. Determine the tensile properties using a strain rate of 0.003 to 0.007 in./in. [mm/mm]/min through the
yield strength. After the yield strength has been exceeded, the cross-head speed may be increased to approximately 0.05 in./in.
[mm/mm]/min to failure.
13.2 Chemical Tests—The chemical analyses shall be conducted by the standard techniques normally used by the manufacturer.
B550/B550M − 07 (2019)
A
TABLE 3 Chemical Requirements
Composition, %
Element
Grades R60702 Grades R60704 Grades R60705
Zirconium + hafnium, min 99.2 97.5 95.5
Hafnium, max 4.5 4.5 4.5
Iron + chromium 0.2 max 0.2 to 0.4 0.2 max
Tin . . . 1.0 to 2.0 . . .
Hydrogen, max 0.005 0.005 0.005
Nitrogen, max 0.025 0.025 0.025
Carbon, max 0.05 0.05 0.05
Niobium . . . . . . 2.0 to 3.0
Oxygen, max 0.16 0.18 0.18
A
By agreement between the purchaser and the manufacturer, analysis may be required and limits established for elements and compounds not specified in the table of
chemical composition.
TABLE 4 Permissible Variation in Check Analysis Between
Different Laboratories
Permissible Variation in
Element
Product Analysis, %
Hydrogen 0.002
Nitrogen 0.01
Carbon 0.01
Hafnium 0.1
Iron + chromium 0.025
Tin 0.05
Niobium 0.05
Oxygen 0.02
A
TABLE 5 Tensile Requirements
Grades
R60702 R60704 R60705
Tensile Strength, min, ksi (MPa) 55 [380] 60 [415] 80 [550]
Yield Strength, min, ksi (MPa) 30 [205] 35 [240] 55 [380]
B
Elongation in 2 in. or 50 mm min, % 16 14 16
A
For bar only.
B
When a sub-size specimen is used, the gage length shall be as specified in Test
Methods E8 for the specimen.
TABLE 6 Dimensional Tolerances for Hot-Finished Rounds,
Squares, Octagons, and Hexagons
Variation in Out of Round,
Specified Size, in. [mm]
Size, in. [mm] Out of Square, in. [mm]
Up–0.500 [13] +0.030 –0 [+0.75] 0.025 [0.64]
Over 0.500–1.000 [13–25] +0.050 –0 [+1.3] 0.040 [1]
Over 1.000–2.000 [25–50] +0.070 –0 [+1.8] 0.060 [1.5]
Over 2.000-4.000 [50–100] +0.150 –0 [+3.8] 0.080 [2]
Over 4.000–6.000 [100–150] +0.250 –0 [+6.4] 0.100 [2.5]
14. Inspection
14.1 The manufacturer shall inspect the material covered by this specification prior to shipment. If so specified in the purchase
order, the purchaser or his representative may witness the testing and inspection of the material at the place of manufacture. In such
cases the purchaser shall state in his purchase order which tests he desires to witness. The manufacturer shall give ample notice
to the purchaser as to the time and place of the designated tests. If the purchaser’s representative does not present himself at the
time agreed upon for the testing, the manufacturer shall consider the requirement for purchaser’s inspection at the place of
manufacture to be waived.
14.2 The manufacturer shall afford the inspector representing the purchaser, without charge, all reasonable facilities to satisfy
him that the material is being furnished in accordance with this specification. This inspection shall be so conducted as not to
interfere unnecessarily with the operation of the works.
B550/B550M − 07 (2019)
TABLE 7 Dimensional Tolerances in Hot-Rolled Flat Bars
A
Variation in
Variation in Width,
Thickness, in. [mm]
Thickness, in. [mm] in. [mm]
Up–0.150 [3.8] +0.020 –0 [+0.5] ⁄8 –0 [3.2]
Over 0.150–0.250 [3.8–6.3] +0.030 –0 [+0.75] ⁄32 –0 [4.0]
Over 0.250–0.350 [6.3–8.9] +0.040 –0 [+1.0] ⁄16 –0 [4.8]
Over 0.350–0.450 [8.9–11.4] +0.050 –0 [+1.3] ⁄32 –0 [5.6]
B
Over 0.450–0550 [11.4–14] +0.070 –0 [+1.8]
B
Over 0.550–1.500 [14–38] +0.080 –0 [+2.0]
B B
Over 1.500 [38]
A
For bars sheared from plate, width tolerances shall be as follows:
B
Depends on size and quantity ordered.
Specified Thickness, in. Width Tolerances, in. [mm]
[mm] Over Under
1 1
Over 0.100–0.150 ⁄16 [1.6] ⁄16 [1.6]
5 5
Over 0.150–0.250
...