ASTM B425-19

Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloys Rod and Bar

ABSTRACT
This specification covers nickel-iron-chromiummolybdenum-copper alloy (UNS N08825 and UNS N08221) in the form of hot-finished and cold-drawn rounds, squares, hexagons, and rectangles. The material shall conform to the composition limits specified. The material shall conform to the mechanical properties specified. Chemical analysis, tension test, and rounding procedure shall be made in accordance to the specified requirements.
SCOPE
1.1 This specification2 covers nickel-iron-chromium-molybdenum-copper alloys (UNS N06845, UNS N08221, UNS N08825, and UNS N08827)3 in the form of hot-finished and cold-drawn rounds, squares, hexagons, and rectangles.  
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 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 problems, 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: Published
• Publication Date: 31-Oct-2019
• 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 B425-11(2017) - Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825, UNS N08221, and <brk/>UNS N06845) Rod and Bar
• Effective Date: 01-Nov-2019
• Refers: ASTM B424-19 - Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloys Plate, Sheet, and Strip
• Effective Date: 01-Nov-2019
• Refers: ASTM B424-11(2016) - Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825, UNS N08221, and <brk/>UNS N06845) Plate, Sheet, and Strip
• Effective Date: 01-Jun-2016
• Refers: ASTM B424-05(2009) - Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221)* Plate, Sheet, and Strip
• Effective Date: 01-Oct-2009
• 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 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 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 B424-05 - Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221)* Plate, Sheet, and Strip
• Effective Date: 01-May-2005
• 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 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

Overview

ASTM B425-19 is the standard specification for nickel-iron-chromium-molybdenum-copper alloys rod and bar. Published by ASTM International, this standard specifies the requirements for alloys such as UNS N08825, UNS N08221, UNS N06845, and UNS N08827, supplied in the form of hot-finished and cold-drawn rounds, squares, hexagons, and rectangles. The specification details composition limits, mechanical properties, testing methods, permissible dimension variations, and marking requirements for high-performance alloy rods and bars used in demanding applications where corrosion resistance and mechanical strength are essential.

Key Topics

• Material Covered: Hot-finished and cold-drawn nickel-iron-chromium-molybdenum-copper alloy rods and bars in various shapes and cross-sections
• Alloy Designations: Includes UNS N08825, UNS N08221, UNS N06845, and UNS N08827
• Mechanical Requirements:
  • Minimum tensile and yield strengths as specified in the standard
  • Elongation and ductility requirements
• Chemical Composition:
  • Strict compositional limits for nickel, iron, chromium, molybdenum, copper, and trace elements
  • Product check analysis procedures for verification
• Dimensional Tolerances:
  • Permissible variations for diameter, thickness, width, length, and straightness for both hot-worked and cold-worked products
  • Machining allowances for hot-worked materials
• Finish and Condition:
  • Supplied in various conditions such as annealed, pickled, rough ground, or rough turned as required by the end-user
• Testing and Inspection:
  • Requirements for chemical analysis and mechanical property testing in accordance with referenced ASTM methods
• Product Marking and Certification:
  • Guidance for marking, traceability, and manufacturer’s certification

Applications

The nickel-iron-chromium-molybdenum-copper alloy rods and bars produced in accordance with ASTM B425-19 are vital for industries and environments demanding high strength and excellent resistance to corrosion and oxidation. Typical applications include:

• Chemical Processing Equipment: Components exposed to harsh chemicals, acids, and chlorides, such as heat exchangers, reaction vessels, and piping systems
• Oil and Gas Industry: Downhole equipment, valves, fasteners, and fittings in environments containing sour gas or seawater
• Pollution Control and Power Generation: Scrubber units, flue gas desulfurization systems, and condensers
• Pharmaceutical and Food Processing: Where resistance to pitting, crevice, and stress-corrosion cracking is critical
• Marine Engineering: Shafting, propeller shafts, and seawater handling systems
• High-Temperature Service: Components exposed to elevated temperatures and aggressive atmospheres

Related Standards

• ASTM B424: Specification for nickel-iron-chromium-molybdenum-copper alloys plate, sheet, and strip
• ASTM B880: Specification for general requirements for chemical check analysis limits for nickel, nickel alloys, and cobalt alloys
• ASTM E8/E8M: Test methods for tension testing of metallic materials
• ASTM E29: Practice for using significant digits in test data to determine conformance with specifications
• ASTM E1473: Test methods for chemical analysis of nickel, cobalt, and high-temperature alloys

Meeting the criteria of ASTM B425-19 ensures that nickel alloy rods and bars are in compliance with global quality expectations for demanding environments, supporting long service life, safety, and regulatory compliance. This standard is recognized internationally and is referenced in major codes and guidelines for critical industry applications.

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:B425 −19
Standard Specification for
Nickel-Iron-Chromium-Molybdenum-Copper Alloys Rod and
Bar
This standard is issued under the fixed designation B425; 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* N08825, UNS N08221, and UNS N06845) Plate, Sheet,
2 and Strip
1.1 This specification covers nickel-iron-chromium-
B880 Specification for General Requirements for Chemical
molybdenum-copper alloys (UNS N06845, UNS N08221,
3 Check Analysis Limits for Nickel, Nickel Alloys and
UNS N08825, and UNS N08827) in the form of hot-finished
Cobalt Alloys
and cold-drawn rounds, squares, hexagons, and rectangles.
E8 Test Methods for Tension Testing of Metallic Materials
1.2 The values stated in inch-pound units are to be regarded
[Metric] E0008_E0008M
as standard. The values given in parentheses are mathematical
E29 Practice for Using Significant Digits in Test Data to
conversions to SI units that are provided for information only
Determine Conformance with Specifications
and are not considered standard.
E1473 Test Methods for Chemical Analysis of Nickel, Co-
1.3 The following precautionary caveat pertains only to the
balt and High-Temperature Alloys
test methods portion, Section 12, of this specification: This
standard does not purport to address all of the safety problems, 3. Terminology
if any, associated with its use. It is the responsibility of the user
3.1 Definitions of Terms Specific to This Standard:
of this standard to become familiar with all hazards including
3.1.1 bar, n—material of rectangular (flats), hexagonal, or
those identified in the appropriate Safety Data Sheet (SDS) for
square solid section up to and including 10 in. (254 mm) in
this product/material as provided by the manufacturer, to
width and ⁄8 in. (3.2 mm) and over in thickness in straight
establish appropriate safety, health, and environmental
lengths.
practices, and determine the applicability of regulatory limi-
3.1.1.1 Discussion—Hot-worked rectangular bar in widths
tations prior to use.
10in.(254mm)andundermaybefurnishedashot-rolledplate
1.4 This international standard was developed in accor-
with sheared or cut edges in accordance with Specification
dance with internationally recognized principles on standard-
B424, provided the mechanical property requirements of this
ization established in the Decision on Principles for the
specification are met.
Development of International Standards, Guides and Recom-
3.1.2 rod, n—material of round solid section furnished in
mendations issued by the World Trade Organization Technical
straight lengths.
Barriers to Trade (TBT) Committee.
4. Ordering Information
2. Referenced Documents
4.1 It is the responsibility of the purchaser to specify all
2.1 ASTM Standards:
requirements that are necessary for the safe and satisfactory
B424 Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS
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
4.1.1 ASTM designation and date of issue,
B02.07 on Refined Nickel and Cobalt and Their Alloys.
4.1.2 UNS number,
Current edition approved Nov. 1, 2019. Published November 2019. Originally
approved in 1964. Last previous edition approved in 2017 as B425 – 11 (2017).
4.1.3 Section—Rod (round) or bar (square, hexagonal, or
DOI: 10.1520/B0425-19.
rectangular),
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
4.1.4 Dimensions, including length,
cation SB-425 in Section II of that code.
4.1.5 Condition (see Appendix X1),
New designation established in accordance with Practice E527 and SAE
J 1086, Practice for Numbering Metals and Alloys (UNS).
4.1.6 Finish (see Appendix X1),
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.7 Quantity—Feet (or metres) or number of pieces,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.1.8 Certification—State if certification is required (Sec-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tion 15),
*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
B425−19
A
TABLE 1 Chemical Requirements
Element UNS N06845 UNS N08221 UNS N08825 UNS N08827
Nickel 44.0–50.0 39.0–46.0 38.0–46.0 39.0–43.0
Chromium 20.0–25.0 20.0–22.0 19.5–23.5 21.0–23.0
B
Iron balance balance 22.0 min balance
Manganese 0.5 1.0 1.0 0.5–0.9
Carbon 0.05 0.025 0.05 0.015
Copper 2.0–2.4 1.5–3.0 1.5–3.0 1.6–2.3
Silicon 0.5 0.5 0.5 0.2–0.5
Sulfur 0.010 0.03 0.03 0.005
Aluminum . 0.2 0.2 0.06–0.25
Titanium . 0.6–1.0 0.6–1.2 .
Molybdenum 5.0–7.0 5.0–6.5 2.5–3.5 4.5–6.5
Tungsten 2.0–5.0 . . .
Cobalt . . . 0.5
Nitrogen . . . 0.03
Columbium . . . 0.15
Boron . . . 0.002–0.004
Magnesium . . . 0.006–0.015
A
Maximum unless range or minimum is given. Where ellipses (.) appear in this table, there is no requirement and analysis for the element need not be determined or
reported.
B
Element shall be determined arithmetically by difference.
TABLE 2 Mechanical Properties (Rod and Bar)
Yield Strength Elongation in 2
Tensile Strength
Alloy Condition 0.2 % offset, min, in.or50mmor
min, ksi (MPa)
D
ksi (MPa) 4 , min,%
UNS N06845 All sizes annealed 100 (690) 40 (276) 30
UNS N08221 All sizes annealed 79 (544) 34 (235) 30
A
UNS N08825 Annealed: 85 (586) 35 (241) 30
Hot-finished, cold–drawn
BBB
Forging Quality:
A
UNS N08827 All sizes annealed 85 (586) 35 (241) 30
A
Not applicable to diameters or cross sections under ⁄32 in. (2.4 mm).
B
Forging quality is furnished to chemical requirements and surface inspection only. No tensile properties are required.
TABLE 3 Permissible Variations in Diameter or Distance Between
Parallel Surfaces of Cold-Worked Rod and Bar
4.1.9 Samples for Product (Check) Analysis—State whether
samples for product (check) analysis should be furnished (see
Permissible Variations From
Specified Dimension,
Specified Dimension, in. (mm)
5.2), and in.
A
(mm)
Plus Minus
4.1.10 Purchaser Inspection—If purchaser wishes to wit-
Rounds: 0
ness tests or inspection of material at place of manufacture, the
1 3
⁄16 (1.6) to ⁄16 (4.8), excl 0.002 (0.05)
purchase order must so state, indicating which test or inspec-
3 1
⁄16 (4.8) to ⁄2 (12.7), excl 0 0.003 (0.08)
1 15
tions are to be witnessed (Section 13).
⁄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)
5. Chemical Composition
Hexagons, squares, rectangles:
⁄2 (12.7) and less 0 0.004 (0.10)
5.1 The material shall conform to the composition limits
1 7
Over ⁄2 (12.7) to ⁄8 (22.2), incl 0 0.005 (0.13)
specified in Table 1.
7 1
Over ⁄8 (22.2) to 1 ⁄4 (31.8), incl 0 0.007 (0.18)
Over 1 ⁄4 (31.8) to 2 (50.8), incl 0 0.009 (0.23)
5.2 If a product (check) analysis is performed by the
A
Dimensions apply to diameter of rounds, to distance between parallel surfaces of
purchaser, it shall be done in accordance with Specification
hexagons and squares, and separately to width and thickness of rectangles.
B880 and the material shall conform to the product (check)
analysis variations defined in Table 1 of Specification B880.
6. Mechanical Properties and Other Requirements
7.2 Out-of-Round—Hot-worked rods and cold-worked rods
6.1 Mechanical Properties—The material shall conform to
(except“forgingquality”)allsizes,instraightlengths,shallnot
the mechanical properties specified in Table 2.
be out-of-round by more than one half the total permissible
7. Dimensions and Permissible Variations variations in diameter shown in Table 3 and Table 4, except for
hot-worked rods ⁄2 in. (12.7 mm) in diameter and under, which
7.1 Diameter, Thickness, or Width—The permissible varia-
may be out-of-round by the total permissible variations in
tions from the specified dimensions as measured on the
diameter shown in Table 4.
diameter or between parallel surfaces of cold-worked rod and
barshallbeasprescribedinTable3,andofhot-workedrodand 7.3 Corners—Cold-worked bars will have practically exact
bar as prescribed in Table 4. angles and sharp corners.
B425−19
TABLE 4 Permissible Variations in Diameter or Distance Between TABLE 6 Permissible Variations in Length of Rods and Bars
Parallel Surfaces of Hot-Worked Rod and Bar
Random mill lengths:
Hot-worked 6 to 24 ft (1.83 to 7.31 m) long with not
Permissible Variations From
Specified Dimension,
more than 25 weight % between 6 and
Specified Dimension, in. (mm)
A
A
in.(mm)
9 ft (1.83 and 2.74 m)
Plus Minus
Cold-worked 6 to 20 ft (1.83 to 6.1 m) long with not
Rod and bar, hot-worked:
more than 25 weight % between 6 and
1 (25.4) and under 0.016 (0.41) 0.016 (0.41)
10 ft (1.83 and 3.05 m).
over 1 (25.4) to 2 (50.8), incl 0.031 (0.79) 0.016 (0.41)
Multiple lengths Furnished in multiples of a specified unit
over 2 (50.8) to 4 (101.6), incl 0.047 (1.19) 0.031 (0.79)
length, within the length limits indicated
over 4 (101.6) 0.125 (3.18) 0.063 (1.60)
above. For each multiple, an allowance
Rod, rough-turned or ground:
of ⁄4 in. (6.4 mm) will be made for cutting,
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
unless otherwise specified. At the
1 (25.4) and over 0.031 (0.79) 0
manufacturer’s option, individual specified
B
Forging quality rod:
unit lengths may be furnished.
Under 1 (25.4) 0.005 (0.13) 0.005 (0.13)
Nominal lengths Specified nominal lengths having a range
1 (25.4) and over 0.031 (0.79) 0
of not less than 2 ft (610 mm) with no
B
A short lengths allowed.
Dimensions apply to diameter of rods, to distance between parallel surfaces of
Cut lengths A specified length to which all rods and
hexagons and squares, and separately to width and thickness of rectangles.
B bars will be cut with a permissible
Spot grinding is permitted to remove minor surface imperfections. The depth of
variation of plus ⁄8 in. (3.2 mm), minus
these spot ground areas shall not exceed 3 % of the diameter of the rod.
0 for sizes 8 in. (203 mm) and less in
diameter or distance between parallel
surfaces. For larger sizes, the permissible
variation shall be + ⁄4 in. (6.4 mm), − 0.
A
For hot-worked sections weighing over 25 lb/ft (37 kg/m) and for smooth forged
7.4 Machining Allowances for Hot-Worked Materials—
products, all sections, short lengths down to 2 ft (610 mm) may be furnished.
B
For cold-worked rods and bars under ⁄2 in. (12.7 mm) in diameter or distance
When the surfaces of hot-worked products are to be machined,
between parallel surfaces ordered to nominal or stock lengths
...

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: B425 − 11 (Reapproved 2017) B425 − 19
Standard Specification for
Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825, UNS N08221, and
Nickel-Iron-Chromium-Molybdenum-Copper Alloys
UNS N06845) Rod and Bar
This standard is issued under the fixed designation B425; 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 Scope*
1.1 This specification covers nickel-iron-chromium-molybdenum-copper alloyalloys (UNS N08825,N06845, UNS N08221,
UNS N08825, and UNS N06845)N08827) in the form of hot-finished and cold-drawn rounds, squares, hexagons, and rectangles.
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 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 problems, 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.
2. Referenced Documents
2.1 ASTM Standards:
B424 Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloys Plate, Sheet, and Strip
B880 Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
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
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 bar, n—material of rectangular (flats), hexagonal, 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 sheared or cut edges
in accordance with Specification B424, provided the mechanical property requirements of this specification are met.
3.1.2 rod, n—material of round solid section furnished in straight lengths.
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 Nov. 1, 2017Nov. 1, 2019. Published November 2017November 2019. Originally approved in 1964. Last previous edition approved in 20112017
as B425 – 11.B425 – 11 (2017). DOI: 10.1520/B0425-11R17.10.1520/B0425-19.
For ASME Boiler and Pressure Vessel Code applications, see related Specification SB-425 in Section II of that code.
New designation established in accordance with Practice E527 and SAE J 1086, Practice for Numbering Metals and Alloys (UNS).
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.
*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
B425 − 19
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 and date of issue,
4.1.2 UNS number,
4.1.3 Section—Rod (round) or bar (square, hexagonal, or rectangular),
4.1.4 Dimensions, including length,
4.1.5 Condition (see Appendix X1),
4.1.6 Finish (see Appendix X1),
4.1.7 Quantity—Feet (or metres) or number of pieces,
4.1.8 Certification—State if certification is required (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 Purchaser Inspection—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 (Section 13).
5. Chemical Composition
5.1 The material shall conform to the composition limits specified in Table 1.
5.2 If a product (check) analysis is performed by the purchaser, it shall be done in accordance with Specification B880 and the
material shall conform to the product (check) analysis variations defined in Table 1 of Specification B880.
6. Mechanical Properties and Other Requirements
6.1 Mechanical Properties—The material shall conform to the mechanical properties specified in Table 2.
A
TABLE 1 Chemical Requirements
Element UNS N08825 UNS N08221 UNS N06845
Nickel 38.0–46.0 39.0–46.0 44.0–50.0
Chromium 19.5–23.5 20.0–22.0 20.0–25.0
B
Iron 22.0 min balance balance
Manganese 1.0 1.0 0.5
Carbon 0.05 0.025 0.05
Copper 1.5–3.0 1.5–3.0 2.0–2.4
Silicon 0.5 0.5 0.5
Sulfur 0.03 0.03 0.010
Aluminum 0.2 0.2 .
Titanium 0.6–1.2 0.6–1.0 .
Molybdenum 2.5–3.5 5.0–6.5 5.0–7.0
Tungsten . . 2.0–5.0
A
TABLE 1 Chemical Requirements
Element UNS N06845 UNS N08221 UNS N08825 UNS N08827
Nickel 44.0–50.0 39.0–46.0 38.0–46.0 39.0–43.0
Chromium 20.0–25.0 20.0–22.0 19.5–23.5 21.0–23.0
B
Iron balance balance 22.0 min balance
Manganese 0.5 1.0 1.0 0.5–0.9
Carbon 0.05 0.025 0.05 0.015
Copper 2.0–2.4 1.5–3.0 1.5–3.0 1.6–2.3
Silicon 0.5 0.5 0.5 0.2–0.5
Sulfur 0.010 0.03 0.03 0.005
Aluminum . 0.2 0.2 0.06–0.25
Titanium . 0.6–1.0 0.6–1.2 .
Molybdenum 5.0–7.0 5.0–6.5 2.5–3.5 4.5–6.5
Tungsten 2.0–5.0 . . .
Cobalt . . . 0.5
Nitrogen . . . 0.03
Columbium . . . 0.15
Boron . . . 0.002–0.004
Magnesium . . . 0.006–0.015
A
Maximum unless range or minimum is given. Where ellipses (.) appear in this table, there is no requirement and analysis for the element need not be determined or
reported.
B
Element shall be determined arithmetically by difference.
B425 − 19
TABLE 2 Mechanical Properties (Rod and Bar)
Yield Strength Elongation in 2
Tensile Strength
Alloy Condition 0.2 % offset, min, in. or 50 mm or
min, ksi (MPa)
D
ksi (MPa) 4 , min,%
UNS N06845 All sizes annealed 100 (690) 40 (276) 30
UNS N08221 All sizes annealed 79 (544) 34 (235) 30
A
UNS N08825 Annealed: 85 (586) 35 (241) 30
Hot-finished, cold–drawn
B B B
Forging Quality:
UNS N08221 All sizes annealed 79 (544) 34 (235) 30
A
UNS N08827 All sizes annealed 85 (586) 35 (241) 30
UNS N06845 All sizes annealed 100 (690) 40 (276) 30
A
Not applicable to diameters or cross sections under ⁄32 in. (2.4 mm).
B
Forging quality is furnished to chemical requirements and surface inspection only. No tensile properties are required.
7. Dimensions and Permissible Variations
7.1 Diameter, Thickness, or Width—The permissible variations from the specified dimensions as measured on the diameter or
between parallel surfaces of cold-worked rod and bar 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 Table 3 and Table 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.
7.3 Corners—Cold-worked bars will have practically exact angles and sharp corners.
7.4 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.
7.5 Length—The permissible variations in length of cold-worked and hot-worked rod and bar shall be as prescribed in Table
6.
7.5.1 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.
7.6 Straightness:
7.6.1 The permissible variations in straightness of cold-worked rod and bar as determined by the departure from straightness
shall be as prescribed in Table 7.
7.6.2 The permissible variations in straightness of hot-worked rod and bar as determined by the departure from straightness shall
be as specified in Table 8.
8. Workmanship, Finish, and Appearance
8.1 The material shall be uniform in quality and condition, smooth, commercially straight or flat, and free of injurious
imperfections.
TABLE 3 Permissible Variations in Diameter or Distance Between
Parallel Surfaces of Cold-Worked Rod and Bar
Permissible Variations From
Specified Dimension,
Specified Dimension, in. (mm)
in.
A
(mm)
Plus Minus
Rounds: 0
1 3
⁄16 (1.6) to ⁄16 (4.8), excl 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)
Hexagons, squares, rectangles:
⁄2 (12.7) and less 0 0.004 (0.10)
1 7
Over ⁄2 (12.7) to ⁄8 (22.2), incl 0 0.005 (0.13)
7 1
Over ⁄8 (22.2) to 1 ⁄4 (31.8), incl 0 0.007 (0.18)
Over 1 ⁄4 (31.8) to 2 (50.8), incl 0 0.009 (0.23)
A
Dimensions apply to diameter of rounds, to distance between parallel surfaces of
hexagons and squares, and separately to width and thickness of rectangles.
B425 − 19
TABLE 4 Permissible Variations in Diameter or Distance Between
Parallel Surfaces of Hot-Worked Rod and Bar
Permissible Variations From
Specified Dimension,
Specified Dimension, in. (mm)
A
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 (101.6), incl 0.047 (1.19) 0.031 (0.79)
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 quality 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
hexagons and 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.
9. Sampling
9.1 Lot—Defin
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