ASTM B446-03(2008)
(Specification)Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625), Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06650)* Rod and Bar
Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625), Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06650)* Rod and Bar
ABSTRACT
This specification covers nickel-chromium-molybdenum-columbium (UNS N06625), nickel-chromium-molybdenum-silicon alloy (UNS N06219), and nickel-chromium-molybdenum-tungsten alloy (UNS N06650) in the form of hot-worked rod and bar and cold-worked rod. The matreial shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, columbium, tantalum, cobalt, molybdenum, iorn, aluminum, titanium, copper, nickel, tungsten, and nitrogen. The materials shall conform to the the heat treatment and room temperature tensile properties such as tensile strength, yield strength, and elongation. Dimensions of the alloys such as diameter, thickness, or width, length and straightness shall also be determined.
SCOPE
1.1 This specification covers nickel-chromium-molybdenum-columbium (UNS N06625), nickel-chromium-molybdenum-silicon alloy (UNS N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06650)* in the form of hot-worked rod and bar and cold-worked rod in the conditions shown in Table 1.
1.1.1 UNS N06625 products are furnished in two grades of different heat-treated conditions:
1.1.1.1 Grade 1 (Annealed)—Material is normally employed in service temperatures up to 1100°F (593°C).
1.1.1.2 Grade 2 (Solution Annealed)—Material is normally employed in service temperatures above 1100°F (593°C) when resistance to creep and rupture is required.
Note 1—Hot-working or reannealing may change properties significantly, depending on working history and temperatures.
1.1.2 Alloys UNS N06219 and UNS N06650 are supplied in solution annealed condition only.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The following precautionary caveat pertains only to the test methods portion, Section 12, 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
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Designation: B446 – 03 (Reapproved 2008)
Standard Specification for
Nickel-Chromium-Molybdenum-Columbium Alloy (UNS
N06625), Nickel-Chromium-Molybdenum-Silicon Alloy (UNS
N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy
(UNS N06650)* Rod and Bar
This standard is issued under the fixed designation B446; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 2. Referenced Documents
1.1 This specification covers nickel-chromium- 2.1 ASTM Standards:
molybdenum-columbium (UNS N06625), nickel-chromium- B443 Specification for Nickel-Chromium-Molybdenum-
molybdenum-silicon alloy (UNS N06219), and Nickel- Columbium Alloy(UNS N06625) and Nickel-Chromium-
Chromium-Molybdenum-Tungsten Alloy (UNS N06650)* in Molybdenum-SiliconAlloy (UNS N06219)* Plate, Sheet,
the form of hot-worked rod and bar and cold-worked rod in the and Strip
conditions shown in Table 1. B880 Specification for General Requirements for Chemical
1.1.1 UNS N06625 products are furnished in two grades of Check Analysis Limits for Nickel, Nickel Alloys and
different heat-treated conditions: Cobalt Alloys
1.1.1.1 Grade 1 (Annealed)—Material is normally em- E8 Test Methods for Tension Testing of Metallic Materials
ployed in service temperatures up to 1100°F (593°C). E29 Practice for Using Significant Digits in Test Data to
1.1.1.2 Grade 2 (Solution Annealed)—Material is normally Determine Conformance with Specifications
employed in service temperatures above 1100°F (593°C) when E1473 Test Methods for Chemical Analysis of Nickel,
resistance to creep and rupture is required. Cobalt, and High-Temperature Alloys
NOTE 1—Hot-working or reannealing may change properties signifi-
3. Terminology
cantly, depending on working history and temperatures.
3.1 Definitions of Terms Specific to This Standard:
1.1.2 AlloysUNSN06219andUNSN06650aresuppliedin
3.1.1 bar, n—material of rectangular (flats) or square solid
solution annealed condition only.
section up to and including 10 in. (254 mm) in width and ⁄8 in.
1.2 The values stated in inch-pound units are to be regarded
(3.2 mm) and over in thickness in straight lengths.
as the standard. The values given in parentheses are for
3.1.1.1 Discussion—Hot-worked rectangular bar in widths
information only.
10 in. (254 mm) and under may be furnished as hot-rolled plate
1.3 The following precautionary caveat pertains only to the
with sheared or cut edges in accordance with Specification
test methods portion, Section 12, of this specification: This
B443, provided the mechanical property requirements of this
standard does not purport to address all of the safety concerns,
specification are met.
if any, associated with its use. It is the responsibility of the user
3.1.2 rod, n—material of round solid section furnished in
of this standard to become familiar with all hazards including
straight lengths.
those identified in the appropriate Material Safety Data Sheet
(MSDS) for this product/material as provided by the manufac- 4. Ordering Information
turer, to establish appropriate safety and health practices, and
4.1 It is the responsibility of the purchaser to specify all
determine the applicability of regulatory limitations prior to
requirements that are necessary for the safe and satisfactory
use.
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.
Current edition approved March 1, 2008. Published March 2008. Originally
approved in 1966. Last previous edition approved in 2003 as B446 - 03. DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/B0446-03R08. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
* New designation established in accordance with Practice E527 and SAE Standards volume information, refer to the standard’s Document Summary page on
J 1086, Practice for Numbering Metals and Alloys (UNS). the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B446 – 03 (2008)
TABLE 1 Conditions for Hot-Worked Rod and Bar and Cold- TABLE 2 Chemical Requirements
A
Worked Rod
Composition
Limits, %
Tensile Yield Elongation
Element
Diameter or Distance
Strength Strength in 2 in. or
N06625 N06219 N06650
Between Parallel
min, ksi (0.2 % offset), 50 mm or
Surfaces, in. (mm)
Carbon 0.10 max 0.05 max 0.03 max
(MPa) min, ksi (MPa) 4D,min,%
B
UNS N06625 Grade 1 (Annealed) Manganese 0.50 max 0.50 max 0.50 max
Up to 4 (102), incl 120 60 30 Silicon 0.50 max 0.70-1.10 0.50 max
Over 4 (102) to 10 (254), 110 50 25 Phosphorus 0.015 max 0.020 max 0.020 max
incl Sulfur 0.015 max 0.010 max 0.010 max
C
UNS N06625 Grade 2 (Solution Annealed) Chromium 20.0 min 18.0-22.0 19.0-21.0
All sizes 100 40 30 23.0 max . .
Columbium + tantalum 3.15 min . 0.05-0.50
UNS N06219 All (Solution Annealed)
All sizes 96 (600) 39 (270) 50 4.15 max .
Cobalt (if determined) 1.0 max 1.0 max 1.0 max
UNS N06650 All (Solution Annealed)
All sizes 116 (800) 58 (400) 45 Molybdenum 8.0 min 7.0-9.0 9.5-12.5
10.0 max . .
A
Forging quality is furnished to chemical requirements and surface inspection
Iron 5.0 max 2.0-4.0 12.0-16.0
only. No tensile properties are required. Forging stock is typically supplied in the
Aluminum 0.40 max 0.50 max 0.05-0.50
hot worked condition, (see X1.1.5).
Titanium 0.40 max 0.50 max .
B
Annealed 1600°F (871°C) minimum.
Copper . 0.50 max 0.30 max
C
Solution annealed at 2000°F (1093°C) minimum, with or without subsequent
A
Nickel 58.0 min Bal. Bal.
stabilization anneal at 1800°F (982°C) minimum to increase resistance to sensi-
Tungsten . . 0.50-2.50
tization.
Nitrogen . . 0.05-0.20
A
Element shall be determined arithmetically by difference.
4.1.1 ASTM designation,
TABLE 3 Permissible Variations in Diameter of Cold-Worked Rod
4.1.2 UNS number,
Permissible Variations from Specified
4.1.3 Section—Rod (round) or bar (square or rectangular),
Specified Dimension,
Dimension, in. (mm)
in. (mm)
4.1.4 Dimensions, including length,
Plus Minus
4.1.5 Condition (see 1.1.1, 1.1.2, and appendix),
1 3
⁄16 (1.6) to ⁄16 (4.8), excl 0 0.002 (0.05)
4.1.5.1 If neither grade of N06625 is specified, Grade 1 will
3 1
⁄16 (4.8) to ⁄2 (12.7), excl 0 0.003 (0.08)
1 15
be supplied,
⁄2 (12.7) to ⁄16 (23.8), incl 0.001 (0.03) 0.002 (0.05)
15 15
Over ⁄16 (23.8) to 1 ⁄16 (49.2), incl 0.0015 (0.04) 0.003 (0.08)
4.1.6 Finish (Section 8),
15 1
Over 1 ⁄16 (49.2) to 2 ⁄2 (63.5), incl 0.002 (0.05) 0.004 (0.10)
4.1.7 Quantity—Feet (or metres) or number of pieces,
4.1.8 Certification—State if certification is required (see
Section 15),
TABLE 4 Permissible Variations in Diameter or Distance
4.1.9 Samples for Product (Check) Analysis—State whether
Between Parallel Surfaces of Hot-Worked Rod and Bar
samples for product (check) analysis should be furnished (see
Permissible Variations from
5.2), and
Specified Dimensions, in.
Specified Dimension,
A
(mm)
4.1.10 Product Marking (see Section 16)—State product in. (mm)
marking requirements. Plus Minus
4.1.11 Purchaser Inspection (see Section 13)—If purchaser
Rod and bar, hot-worked:
1 (25.4) and under 0.016 (0.41) 0.016 (0.41)
wishes to witness tests or inspection of material at place of
Over 1 (25.4) to 2 (50.8), incl 0.031 (0.79) 0.016 (0.41)
manufacture, the purchase order must so state, indicating
Over 2 (50.8) to 4 0.047 (1.19) 0.031 (0.79)
which test or inspections are to be witnessed.
(101.6), incl
Over 4 (101.6) 0.125 (3.18) 0.063 (1.60)
Rod, rough-turned or
5. Chemical Composition
ground:
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
5.1 The material shall conform to the composition limits
1 (25.4) and over 0.031 (0.79) 0
specified in Table 2. B
Forging quantity rod:
5.2 If a product (check) analysis is performed by the
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
purchaser, the material shall conform to the product (check)
A
Dimensions apply to diameter of rods, to distance between parallel surfaces of
analysis variations in Specification B880.
squares, and separately to width and thickness of rectangles.
B
Spot grinding is permitted to remove minor surface imperfections. The depth of
6. Mechanical Properties and Other Requirements
these spot ground areas shall not exceed 3 % of the diameter of the rod.
6.1 Mechanical Properties—The material shall conform to
the heat treatment and room temperature tensile properties
prescribed in Table 1.
7.2 Out-of-Round—Hot-worked rods and cold-worked rods
(except“forgingquality”)allsizes,instraightlengths,shallnot
7. Dimensions and Permissible Variations
be out-of-round by more than one half the total permissible
variations in diameter shown in Tables 3 and 4, except for
7.1 Diameter, Thickness, or Width—The permissible varia-
hot-worked rods ⁄2 in. (12.7 mm) in diameter and under, which
tions from the specified dimensions of cold-worked rod shall
may be out-of-round by the total permissible variations in
be as prescribed in Table 3, and of hot-worked rod and bar as
prescribed in Table 4. diameter shown in Table 4.
B446 – 03 (2008)
TABLE 5 Normal Machining Allowances for Hot-Worked Material
Finished-Machined Dimensions for Finishes As Normal Machining Allowance, in. (mm)
A
Indicated below, in. (mm) On Diameter, Distance Between For Rectangular Bar
For Rods Parallel Surfaces
of Square Bars
On Thickness On Width
B
Hot-worked:
7 1 1 1 3
Up to ⁄8 (22.2), incl ⁄8 (3.2) ⁄8 (3.2) ⁄8 (3.2) ⁄16 (4.8)
7 7 1 3 1 3
Over ⁄8 to 1 ⁄8 (22.2 to 47.6), incl ⁄8 (3.2) ⁄16 (4.8) ⁄8 (3.2) ⁄16 (4.8)
7 7 3 1 3
Over 1 ⁄8 to 2 ⁄8 (47.6 to 73.0), incl ⁄16 (4.8) ⁄4 (6.4) . . . ⁄16 (4.8)
7 13 1 3
Over 2 ⁄8 to 3 ⁄16 (73.0 to 96.8), incl ⁄4 (6.4) . . ⁄16 (4.8)
13 1 3
Over 3 ⁄16 (96.8) ⁄4 (6.4) . . ⁄8 (9.5)
C
Hot-worked rods, rough-turned or rough ground:
15 1
⁄16 to 4 (23.8 to 101.6), incl in diameter ⁄16 (1.6) . . .
Over 4 to 12 (101.6 to 304.8), incl in diameter ⁄8 (3.2) . . .
A
Dimensions apply to diameter of rods, to distance between parallel surfaces of square bar, and separately to width and thickness of rectangular bar.
B
The allowances for hot-worked material in Table 5 are recommended for rods machined in lengths of 3 ft (0.91 m) or less and for bars machined in lengths of 2 ft (0.61
m) or less. Hot-worked material to be machined in longer l
...
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:B446–02 Designation: B 446 – 03 (Reapproved 2008)
Standard Specification for
Nickel-Chromium-Molybdenum-Columbium Alloy (UNS
N06625), Nickel-Chromium-Molybdenum-Silicon Alloy (UNS
N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy
(UNS N06650)* Rod and Bar
This standard is issued under the fixed designation B 446; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 This specification covers nickel-chromium-molybdenum-columbium (UNS N06625), nickel-chromium-molybdenum-
silicon alloy (UNS N06219), and Nickel-Chromium-Molybdenum-TungstenAlloy (UNS N06650)* in the form of hot-worked rod
and bar and cold-worked rod in the conditions shown in Table 1.
1.1.1 UNS N06625 products are furnished in two grades of different heat-treated conditions:
1.1.1.1 Grade 1 (Annealed)—Material is normally employed in service temperatures up to 1100°F (593°C).
1.1.1.2 Grade 2 (Solution Annealed)—Material is normally employed in service temperatures above 1100°F (593°C) when
resistance to creep and rupture is required.
NOTE 1—Hot-working or reannealing may change properties significantly, depending on working history and temperatures.
1.1.2 Alloys UNS N06219 and UNS N06650 are supplied in solution annealed condition only.
1.2 The values stated in inch-pound units are to be regarded as the standard.The values given in parentheses are for information
only.
1.3 The following precautionary caveat pertains only to the test methods portion, Section 12, 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for
this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the
applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
B 443 Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNSN06625) and Nickel-Chromium-
Molybdenum-Silicon Alloy (UNS N06219) Plate, Sheet, and Strip
B 880 SpecificationforGeneralRequirementsforChemicalCheckAnalysisLimitsforNickel,NickelAlloysandCobaltAlloys
E 8 Test Methods for Tension Testing of Metallic Materials
E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E 1473 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 barbar, n—material of rectangular (flats) or square solid section up to and including 10 in. (254 mm) in width and ⁄8 in.
(3.2 mm) and over in thickness in straight lengths.
3.1.1.1 Discussion—Hot-worked rectangular bar in widths 10 in. (254 mm) and under may be furnished as hot-rolled plate with
ThisspecificationisunderthejurisdictionofASTMCommitteeB02onNonferrousMetalsandAlloysandisthedirectresponsibilityofSubcommitteeB02.07onRefined
Nickel and Cobalt and Their Alloys.
{1
Current edition approved May 10, 2002. Published July 2002. Originally published as B446–66. Last previous edition B446–00 .
Current edition approved March 1, 2008. Published March 2008. Originally approved in 1966. Last previous edition approved in 2003 as B 446 - 03.
* New designation established in accordance with Practice E 527 and SAE J 1086, Practice for Numbering Metals and Alloys (UNS).
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
, Vol 02.04.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.
B 446 – 03 (2008)
TABLE 1 Conditions for Hot-Worked Rod and Bar and Cold-
A
Worked Rod
Tensile Yield Elongation
Diameter or Distance
Strength Strength in 2 in. or
Between Parallel
min, ksi (0.2 % offset), 50 mm or
Surfaces, in. (mm)
(MPa) min, ksi (MPa) 4D,min,%
B
UNS N06625 Grade 1 (Annealed)
Up to 4 (102), incl 120 60 30
Over 4 (102) to 10 (254), 110 50 25
incl
C
UNS N06625 Grade 2 (Solution Annealed)
All sizes 100 40 30
UNS N06219 All (Solution Annealed)
All sizes 96 (600) 39 (270) 50
UNS N06650 All (Solution Annealed)
All sizes 116 (800) 58 (400) 45
A
Forging quality is furnished to chemical requirements and surface inspection
only. No tensile properties are required. Forging stock is typically supplied in the
hot worked condition, (see X1.1.5).
B
Annealed 1600°F (871°C) minimum.
C
Solution annealed at 2000°F (1093°C) minimum, with or without subsequent
stabilization anneal at 1800°F (982°C) minimum to increase resistance to sensi-
tization.
sheared or cut edges in accordance with Specification B 443, provided the mechanical property requirements of this specification
are met.
3.1.2 rodrod, n—material of round solid section furnished in straight lengths.
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 ASTM designation,
4.1.2 UNS number,
4.1.3 Section—Rod (round) or bar (square or rectangular),
4.1.4 Dimensions, including length,
4.1.5 Condition (see 1.1.1, 1.1.2, and appendix),
4.1.5.1 If neither grade of N06625 is specified, Grade 1 will be supplied,
4.1.6 Finish (Section 8),
4.1.7 Quantity—Feet (or metres) or number of pieces,
4.1.8 Certification— State if certification is required (see Section 15),
4.1.9 Samples for Product (Check) Analysis—State whether samples for product (check) analysis should be furnished (see 5.2),
and
4.1.10 Product Marking (see Section 16)—State product marking requirements.
4.1.11 Purchaser Inspection (see Section 13)—If purchaser wishes to witness tests or inspection of material at place of
manufacture, the purchase order must so state, indicating which test or inspections are to be witnessed.
5. Chemical Composition
5.1 The material shall conform to the composition limits specified in Table 2.
5.2 If a product (check) analysis is performed by the purchaser, the material shall conform to the product (check) analysis
variations in Specification B 880.
6. Mechanical Properties and Other Requirements
6.1 Mechanical Properties—The material shall conform to the heat treatment and room temperature tensile properties
prescribed in Table 1.
7. Dimensions and Permissible Variations
7.1 Diameter, Thickness, or Width—The permissible variations from the specified dimensions of cold-worked rod shall be as
prescribed in Table 3, and of hot-worked rod and bar as prescribed in Table 4.
7.2 Out-of-Round— Hot-worked rods and cold-worked rods (except “forging quality”) all sizes, in straight lengths, shall not be
out-of-round by more than one half the total permissible variations in diameter shown in Tables 3 and 4, except for hot-worked
rods ⁄2 in. (12.7 mm) in diameter and under, which may be out-of-round by the total permissible variations in diameter shown in
Table 4.
B 446 – 03 (2008)
TABLE 2 Chemical Requirements
Composition
Limits, %
Element
N06625 N06219 N06650
Carbon 0.10 max 0.05 max 0.03 max
Manganese 0.50 max 0.50 max 0.50 max
Silicon 0.50 max 0.70-1.10 0.50 max
Phosphorus 0.015 max 0.020 max 0.020 max
Sulfur 0.015 max 0.010 max 0.010 max
Chromium 20.0 min 18.0-22.0 18.0-21.0
Chromium 20.0 min 18.0-22.0 19.0-21.0
23.0 max . .
Columbium + tantalum 3.15 min . 0.05-0.50
4.15 max . .
4.15 max .
Cobalt (if determined) 1.0 max 1.0 max .
Molybdenum 8.0 min 7.0-9.0 9.5-12.5
10.0 max . .
Iron 5.0 max 2.0-4.0 12.0-16.0
Aluminum 0.40 max 0.50 max 0.05-0.50
Titanium 0.40 max 0.50 max .
Copper . 0.50 max .
A
Nickel 58.0 min Bal. Bal.
Tungsten . . 0.50-2.50
Nitrogen . . 0.05-0.20
A
Element shall be determined arithmetically by difference.
TABLE 3 Permissible Variations in Diameter of Cold-Worked Rod
Permissible Variations from Specified
Specified Dimension,
Dimension, in. (mm)
in. (mm)
Plus Minus
1 3
⁄16 (1.6) to ⁄16 (4.8), excl 0 0.002 (0.05)
3 1
⁄16 (4.8) to ⁄2 (12.7), excl 0 0.003 (0.08)
1 15
⁄2 (12.7) to ⁄16 (23.8), incl 0.001 (0.03) 0.002 (0.05)
15 15
Over ⁄16 (23.8) to 1 ⁄16 (49.2), incl 0.0015 (0.04) 0.003 (0.08)
15 1
Over 1 ⁄16 (49.2) to 2 ⁄2 (63.5), incl 0.002 (0.05) 0.004 (0.10)
TABLE 4 Permissible Variations in Diameter or Distance
Between Parallel Surfaces of Hot-Worked Rod and Bar
Permissible Variations from
Specified Dimensions, in.
Specified Dimension,
A
(mm)
in. (mm)
Plus Minus
Rod and bar, hot-worked:
1 (25.4) and under 0.016 (0.41) 0.016 (0.41)
Over 1 (25.4) to 2 (50.8), incl 0.031 (0.79) 0.016 (0.41)
Over 2 (50.8) to 4 0.047 (1.19) 0.031 (0.79)
(101.6), incl
Over 4 (101.6) 0.125 (3.18) 0.063 (1.60)
Rod, rough-turned or
ground:
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
B
Forging quantity rod:
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
1 (25.4) and over 0.031 (0.79) 0
A
Dimensions apply to diameter of rods, to distance between parallel surfaces of
squares, and separately to width and thickness of rectangles.
B
Spot grinding is permitted to remove minor surface imperfections. The depth of
these spot ground areas shall not exceed 3 % of the diameter of the rod.
7.3 Machining Allowances for Hot-Worked Materials—When the surfaces of hot-worked products are to be machined, the
allowances prescribed in Table 5 are recommended for normal machining operations.
7.4 Length—The permissible variations in length of cold-worked and hot-worked rod and bar shall be as prescribed in Table
6.
7.4.1 Rods and bars ordered to random or nominal lengths will be furnished with either cropped or saw-cut ends; material
ordered to cut lengths will be furnished with square saw-cut or machined ends.
7.5 Straightness:
B 446 – 03 (2008)
TABLE 5 Normal Machining Allowances for Hot-Worked Material
Finished-Machined Dimensions for Finishes As Normal Machining Allowance, in. (mm)
A
Indicated below, in. (mm) On Diameter, Distance Between For Rectangular Bar
For Rods Parallel Surfaces
of Square Bars
On Thickness On Width
B
Hot-worked:
7 1 1 1 3
Up to
...
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