ASTM B674-21
(Specification)Standard Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Tube
Standard Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Tube
ABSTRACT
This specification covers the standard for UNS N08923, UNS N0835, and UNS N08926 welded tube for general corrosion applications. The tubes shall be manufactured from flat-rolled alloy by an automatic welding process with no addition of filler metal. The tubes shall also undergo cold-working subsequent to welding and prior to final heat treatment. Mechanical properties such as tensile strength, yield strength, and elongation shall be examined accordingly. Each specimen shall also be subjected to a flattening test, flange test, and nondestructive testing such as hydrostatic, pneumatic, eddy current, ultrasonic, leak, and electric test.
SCOPE
1.1 This specification covers UNS N08925,2 UNS N08354, and UNS N08926 welded tube for general corrosion applications.
1.2 This specification covers outside diameter and nominal wall tube.
1.2.1 The tube sizes covered by this specification are 1/8 to 5 in. (3.2 to 127 mm) in outside diameter and 0.015 to 0.320 in. (0.38 to 8.13 mm), inclusive, in wall thickness.
1.3 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are now covered by Specification A249/A249M.
1.4 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.
1.5 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.
1.6 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-Mar-2021
- Technical Committee
- B02 - Nonferrous Metals and Alloys
- Drafting Committee
- B02.07 - Refined Nickel and Cobalt and Their Alloys
Relations
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Apr-2019
- Effective Date
- 01-Nov-2018
- Effective Date
- 01-Jul-2018
- Effective Date
- 01-Sep-2016
- Effective Date
- 01-May-2016
- Effective Date
- 01-Dec-2015
- Effective Date
- 01-Sep-2015
- Effective Date
- 01-Oct-2014
- Effective Date
- 01-Mar-2014
- Effective Date
- 01-Feb-2013
- Effective Date
- 01-Oct-2010
- Effective Date
- 01-Nov-2008
- Effective Date
- 01-Mar-2008
- Effective Date
- 01-Sep-2007
Overview
ASTM B674-21 is the standard specification developed by ASTM International for welded tubes made from nickel-iron-chromium-molybdenum and iron-nickel-chromium-molybdenum-copper alloys, specifically covering UNS N08925, UNS N08354, and UNS N08926. This standard focuses on the production and performance criteria of welded tubes intended for general corrosion applications across various industries. The specification outlines requirements for chemical composition, manufacturing process, mechanical properties, and mandatory tests to ensure product quality and fitness for use.
Key Topics
Material Grades and Applications
ASTM B674-21 covers welded tubes manufactured from the following alloys:- UNS N08925 (nickel-iron-chromium-molybdenum-copper)
- UNS N08354 (iron-nickel-chromium-molybdenum-copper)
- UNS N08926 (nickel-iron-chromium-molybdenum-copper)
Tube Dimensions
This specification includes requirements for:- Outside diameter: 1/8 to 5 inches (3.2 to 127 mm)
- Wall thickness: 0.015 to 0.320 inch (0.38 to 8.13 mm)
Manufacturing Process
- Tubes are produced from flat-rolled alloy by automatic welding without filler metal.
- Post-weld cold work is performed before the final heat treatment, enhancing mechanical properties and corrosion resistance.
- Finished tubes are subjected to oxide removal unless they are bright annealed.
Testing and Quality Control
- Each lot is tested for mechanical properties, including tensile strength, yield strength, and elongation.
- Required mechanical tests include flattening and flange tests.
- Nondestructive testing options: hydrostatic, pneumatic, eddy current, ultrasonic, leak, and electric testing, dependent on customer specification or manufacturer selection.
Conformance and Safety
- Tubes must meet defined chemical composition limits.
- Mechanical properties must conform to minimum strength and elongation thresholds.
- Users are responsible for following appropriate safety, health, and environmental practices, referencing Safety Data Sheets as necessary.
Applications
Welded tubes conforming to ASTM B674-21 are widely used in applications where resistance to general corrosion is critical. Common sectors include:
- Chemical Processing: Handling acids, chlorides, and other corrosive substances.
- Oil and Gas: Piping systems exposed to aggressive environments.
- Pharmaceuticals: Clean-in-place systems requiring high material purity and corrosion resistance.
- Marine Engineering: Components exposed to seawater or other harsh conditions.
- Power Generation: Heat exchangers and condensers subjected to corrosive fluids.
Their high nickel, chromium, molybdenum, and copper content makes these welded tubes ideal for demanding environments where both mechanical performance and resistance to corrosion are essential.
Related Standards
Several ASTM standards are referenced and may govern additional requirements for nickel alloy welded tubes:
- ASTM A249/A249M: Specification for welded austenitic steel boiler, superheater, heat-exchanger, and condenser tubes (for grades previously classified as stainless steel, such as UNS N08904).
- ASTM B751: General requirements for nickel and nickel alloy welded tube.
- ASTM E527: Practice for numbering metals and alloys in the Unified Numbering System (UNS).
Users should ensure compliance with all relevant standards and refer to the most current editions for authoritative requirements.
Keywords: ASTM B674-21, nickel alloy welded tube, UNS N08925, UNS N08354, UNS N08926, corrosion resistant tubing, quality control, nondestructive testing, flat-rolled alloy, mechanical properties, ASTM International standards.
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Frequently Asked Questions
ASTM B674-21 is a technical specification published by ASTM International. Its full title is "Standard Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Tube". This standard covers: ABSTRACT This specification covers the standard for UNS N08923, UNS N0835, and UNS N08926 welded tube for general corrosion applications. The tubes shall be manufactured from flat-rolled alloy by an automatic welding process with no addition of filler metal. The tubes shall also undergo cold-working subsequent to welding and prior to final heat treatment. Mechanical properties such as tensile strength, yield strength, and elongation shall be examined accordingly. Each specimen shall also be subjected to a flattening test, flange test, and nondestructive testing such as hydrostatic, pneumatic, eddy current, ultrasonic, leak, and electric test. SCOPE 1.1 This specification covers UNS N08925,2 UNS N08354, and UNS N08926 welded tube for general corrosion applications. 1.2 This specification covers outside diameter and nominal wall tube. 1.2.1 The tube sizes covered by this specification are 1/8 to 5 in. (3.2 to 127 mm) in outside diameter and 0.015 to 0.320 in. (0.38 to 8.13 mm), inclusive, in wall thickness. 1.3 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are now covered by Specification A249/A249M. 1.4 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. 1.5 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. 1.6 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.
ABSTRACT This specification covers the standard for UNS N08923, UNS N0835, and UNS N08926 welded tube for general corrosion applications. The tubes shall be manufactured from flat-rolled alloy by an automatic welding process with no addition of filler metal. The tubes shall also undergo cold-working subsequent to welding and prior to final heat treatment. Mechanical properties such as tensile strength, yield strength, and elongation shall be examined accordingly. Each specimen shall also be subjected to a flattening test, flange test, and nondestructive testing such as hydrostatic, pneumatic, eddy current, ultrasonic, leak, and electric test. SCOPE 1.1 This specification covers UNS N08925,2 UNS N08354, and UNS N08926 welded tube for general corrosion applications. 1.2 This specification covers outside diameter and nominal wall tube. 1.2.1 The tube sizes covered by this specification are 1/8 to 5 in. (3.2 to 127 mm) in outside diameter and 0.015 to 0.320 in. (0.38 to 8.13 mm), inclusive, in wall thickness. 1.3 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are now covered by Specification A249/A249M. 1.4 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. 1.5 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. 1.6 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.
ASTM B674-21 is classified under the following ICS (International Classification for Standards) categories: 77.150.40 - Nickel and chromium products. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM B674-21 has the following relationships with other standards: It is inter standard links to ASTM A249/A249M-24, ASTM B751-19, ASTM B751-08(2018), ASTM A249/A249M-18, ASTM A249/A249M-16a, ASTM A249/A249M-16, ASTM A249/A249M-15a, ASTM A249/A249M-15, ASTM A249/A249M-14a, ASTM A249/A249M-14, ASTM B751-08(2013), ASTM A249/A249M-10a, ASTM B751-08, ASTM A249/A249M-08, ASTM A249/A249M-07. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM B674-21 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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:B674 −21
Standard Specification for
Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-
Chromium-Molybdenum-Copper Welded Tube
This standard is issued under the fixed designation B674; 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* mendations issued by the World Trade Organization Technical
2 Barriers to Trade (TBT) Committee.
1.1 This specification covers UNS N08925, UNS N08354,
and UNS N08926 welded tube for general corrosion applica-
2. Referenced Documents
tions.
2.1 ASTM Standards:
1.2 This specification covers outside diameter and nominal
A249/A249M Specification for Welded Austenitic Steel
wall tube.
Boiler, Superheater, Heat-Exchanger, and Condenser
1.2.1 The tube sizes covered by this specification are ⁄8 to 5
Tubes
in. (3.2 to 127 mm) in outside diameter and 0.015 to 0.320 in.
B751 Specification for General Requirements for Nickel and
(0.38 to 8.13 mm), inclusive, in wall thickness.
Nickel Alloy Welded Tube
1.3 ASTM International has adopted definitions whereby E527 Practice for Numbering Metals and Alloys in the
some grades, such as UNS N08904, previously in this speci- Unified Numbering System (UNS)
fication were recognized as stainless steels, because those
3. Ordering Information
grades have iron as the largest element by mass percent. Such
grades are under the oversight of ASTM Committee A01 and
3.1 Orders for material to this specification should include
itssubcommittees.TheproductsofN08904previouslycovered the following information:
in this specification are now covered by Specification A249/
3.1.1 Quantity (feet or number of lengths),
A249M. 3.1.2 UNS number,
3.1.3 Size (outsize diameter, minimum or average wall
1.4 The values stated in inch-pound units are to be regarded
thickness),
as standard. The values given in parentheses are mathematical
3.1.4 Length (random or specific),
conversions to SI units that are provided for information only
3.1.5 Class, and
and are not considered standard.
3.1.6 ASTM designation.
1.5 This standard does not purport to address all of the
3.1.7 Product Analysis—State if required.
safety concerns, if any, associated with its use. It is the
3.1.8 Certification—State if a certification or a report of test
responsibility of the user of this standard to become familiar
results is required.
with all hazards including those identified in the appropriate
3.1.9 Purchaser Inspection—State which tests or inspec-
Safety Data Sheet (SDS) for this product/material as provided
tions are to be witnessed, if any (see Tables 1 and 2).
by the manufacturer, to establish appropriate safety, health,
and environmental practices, and determine the applicability
4. Materials and Manufacture
of regulatory limitations prior to use.
4.1 Tube shall be made from flat-rolled alloy by an auto-
1.6 This international standard was developed in accor-
matic welding process with no addition or filler metal. Subse-
dance with internationally recognized principles on standard-
quent to welding and prior to final annealing, the material shall
ization established in the Decision on Principles for the
be cold-worked in either the weld metal only or both weld and
Development of International Standards, Guides and Recom-
base metal.
NOTE 1—The recommended heat treatment shall consist of heating to a
This specification is under the jurisdiction of ASTM Committee B02 on temperature of 1975 to 2150°F (1080 to 1180°C) for UNS N08354 or
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee 2010 to 2100°F (1100 to 1150°C) for UNS N08925 and UNS N08926,
B02.07 on Refined Nickel and Cobalt and Their Alloys.
Current edition approved April 1, 2021. Published April 2021. Originally
approved in 1980. Last previous edition approved in 2016 as B674 – 05 (2016). For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/B0674-21. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
New designation established in accordance with Practice E527 and SAE J1086, Standards volume information, refer to the standard’s Document Summary page on
Practice for Numbering Metals and Alloys (UNS). the A
...
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: B674 − 05 (Reapproved 2016) B674 − 21
Standard Specification for
UNS N08925, UNS N08354, and UNS N08926 Nickel-Iron-
Chromium-Molybdenum and Iron-Nickel-Chromium-
Molybdenum-Copper Welded Tube
This standard is issued under the fixed designation B674; 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 UNS N08925, UNS N08354, and UNS N08926 welded tube for general corrosion applications.
1.2 This specification covers outside diameter and nominal wall tube.
1.2.1 The tube sizes covered by this specification are ⁄8 to 5 in. (3.2 to 127 mm) in outside diameter and 0.015 to 0.320 in. (0.38
to 8.13 mm), inclusive, in wall thickness.
1.3 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were
recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the
oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are
now covered by Specification A249/A249M.
1.4 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.
1.5 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.
1.6 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:
A249/A249M Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
B751 Specification for General Requirements for Nickel and Nickel Alloy Welded Tube
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, 2016April 1, 2021. Published June 2016April 2021. Originally approved in 1980. Last previous edition approved in 20112016 as
B674 – 05 (2011).(2016). DOI: 10.1520/B0674-05R16.10.1520/B0674-21.
New designation established in accordance with Practice E527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS).
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
B674 − 21
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
3. Ordering Information
3.1 Orders for material to this specification should include the following information:
3.1.1 Quantity (feet or number of lengths),
3.1.2 UNS number,
3.1.3 Size (outsize diameter, minimum or average wall thickness),
3.1.4 Length (random or specific),
3.1.5 Class, and
3.1.6 ASTM designation.
3.1.7 Product Analysis—State if required.
3.1.8 Certification—State if a certification or a report of test results is required.
3.1.9 Purchaser Inspection—State which tests or inspections are to be witnessed, if any (see Tables 1 and 2).
4. Materials and Manufacture
4.1 Tube shall be made from flat-rolled alloy by an automatic welding process with no addition or filler metal. Subse
...
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