ASTM B621-21

Standard Specification for Nickel-Iron-Chromium-Molybdenum Alloy Rod

ABSTRACT
This specification covers nickel-iron chromium-molybdenum alloy (UNS N08320) rod for use in general corrosive service. The rods are classified according to their sizes. The material shall conform to the composition limits specified. Chemical analysis and tension test shall be made to conform to the specified requirements.
SCOPE
1.1 This specification2 covers nickel-iron chromium-molybdenum alloy (UNS N08320)3 rod for use in general corrosive service.  
1.2 The following products are covered under this specification:  
1.2.1 Rods 5/16 to 3/4 in. (7.94 to 19.05 mm) excl in diameter, hot or cold finished, solution annealed and pickled or mechanically descaled.  
1.2.2 Rods 3/4 to 31/2 in. (19.05 to 88.9 mm) incl in diameter, hot or cold finished, solution annealed, ground or turned.  
1.3 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.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
1.5 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-2021
• 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

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:B621 −21
Standard Specification for
1
Nickel-Iron-Chromium-Molybdenum Alloy Rod
This standard is issued under the fixed designation B621; 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* 2. Referenced Documents
2 4
1.1 This specification covers nickel-iron chromium- 2.1 ASTM Standards:
3
molybdenum alloy (UNS N08320) rod for use in general B880 Specification for General Requirements for Chemical
corrosive service. Check Analysis Limits for Nickel, Nickel Alloys and
Cobalt Alloys
1.2 The following products are covered under this specifi-
B899 Terminology Relating to Non-ferrous Metals and Al-
cation:
loys
5 3
1.2.1 Rods ⁄16 to ⁄4 in. (7.94 to 19.05 mm) excl in diameter,
E8 Test Methods for Tension Testing of Metallic Materials
hot or cold finished, solution annealed and pickled or mechani-
[Metric] E0008_E0008M
cally descaled.
E29 Practice for Using Significant Digits in Test Data to
3 1
1.2.2 Rods ⁄4 to 3 ⁄2 in. (19.05 to 88.9 mm) incl in diameter,
Determine Conformance with Specifications
hot or cold finished, solution annealed, ground or turned.
E527 Practice for Numbering Metals and Alloys in the
1.3 The values stated in inch-pound units are to be regarded
Unified Numbering System (UNS)
as standard. The values given in parentheses are mathematical
E1473 Test Methods for Chemical Analysis of Nickel, Co-
conversions to SI units that are provided for information only
balt and High-Temperature Alloys
and are not considered standard.
1.4 This standard does not purport to address all of the 3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 The definitions in Terminology B899 are applicable to
responsibility of the user of this standard to become familiar
this specification.
with all hazards including those identified in the appropriate
3.2 Definitions of Terms Specific to This Standard:
Safety Data Sheet (SDS) for this product/material as provided
3.2.1 rod, n—a product of round solid section furnished in
by the manufacturer, to establish appropriate safety, health,
straight lengths.
and environmental practices, and determine the applicability
of regulatory limitations prior to use.
4. Ordering Information
1.5 This international standard was developed in accor-
4.1 It is the responsibility of the purchaser to specify all
dance with internationally recognized principles on standard-
requirements that are necessary for material ordered under this
ization established in the Decision on Principles for the
specification. Examples of such requirements include but are
Development of International Standards, Guides and Recom-
not limited to the following:
mendations issued by the World Trade Organization Technical
4.1.1 Dimensions—Nominal diameter and length. The
Barriers to Trade (TBT) Committee.
shortest useable multiple length shall be specified (Table 1).
4.1.2 Certification—State if certification or a report of test
results is required (Section 15).
1
This specification is under the jurisdiction of ASTM Committee B02 on
4.1.3 Purchaser Inspection—State which tests or inspec-
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys.
tions are to be witnessed (Section 13).
Current edition approved Nov. 1, 2021. Published December 2021. Originally
approved in 1977. Last previous edition approved in 2016 as B621 – 02 (2016).
DOI: 10.1520/B0621-21.
2 4
For ASME Boiler and Pressure Vessel Code applications see related Specifi- For referenced ASTM standards, visit the ASTM website, www.astm.org, or
cation SB-621 in Section II of that Code. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
New designation established in accordance with ASTM E527 and SAE J1086, Standards volume information, refer to the standard’s Document Summary page on
Recommended Practice for Numbering Metals and Alloys (UNS). 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
1

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B621−21
TABLE 1 Permissible Variations in Length of Rods TABLE 3 Mechanical Property Requirements
Random mill lengths 2 to 12 ft (610 to 3660 mm) long Tensile Strength, min, Yield Strength (0.2 % Elongation in 2 in.
A
with not more than 25 weight % under psi (MPa) Offset), min, psi (
...

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: B621 − 02 (Reapproved 2016) B621 − 21
Standard Specification for
Nickel-Iron-Chromium-Molybdenum Alloy (UNS N08320)
1
Rod
This standard is issued under the fixed designation B621; 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*
2 3
1.1 This specification covers nickel-iron chromium-molybdenum alloy (UNS N08320) rod for use in general corrosive service.
1.2 The following products are covered under this specification:
5 3
1.2.1 Rods ⁄16 to ⁄4 in. (7.94 to 19.05 mm) excl in diameter, hot or cold finished, solution annealed and pickled or mechanically
descaled.
3 1
1.2.2 Rods ⁄4 to 3 ⁄2 in. (19.05 to 88.9 mm) incl in diameter, hot or cold finished, solution annealed, ground or turned.
1.3 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.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet
(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety safety, health, and healthenvi-
ronmental practices, and determine the applicability of regulatory limitations prior to use.
1.5 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
4
2.1 ASTM Standards:
B880 Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
B899 Terminology Relating to Non-ferrous Metals and 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
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
E1473 Test Methods for Chemical Analysis of Nickel, Cobalt and High-Temperature Alloys
1
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 June 1, 2016Nov. 1, 2021. Published June 2016December 2021. Originally approved in 1977. Last previous edition approved in 20112016 as
B621 – 02 (2011).(2016). DOI: 10.1520/B0621-02R16.10.1520/B0621-21.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SB-621 in Section II of that Code.
3
New designation established in accordance with ASTM E527 and SAE J1086, Recommended Practice for Numbering Metals and Alloys (UNS).
4
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
1

---------------------- Page: 1 ----------------------
B621 − 21
3. Terminology
3.1 The definitions in Terminology B899 are applicable to this specification.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 rod, n—a product 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 material ordered under this
specification. Examples of such requirements include but are not limited to the following:
4.1.1 Dimensions—Nominal diameter and length. The shortest useable multiple length shall be specified (Table 1).
4.1.2 Certification—State if certification or a report of test results is required (Section 15).
4.1.3 Purchaser Inspection—State which tests or inspections are to be witnessed (Section 13).
4.1.4 Samples for Product (Check) Analysis—State whethe
...