ASTM B705-24

Standard Specification for Nickel-Chromium-Molybdenum-Niobium Alloy, Nickel-Chromium-Molybdenum-Silicon Alloy, and Nickel-Iron-Chromium-Molybdenum-Copper Alloy Welded Pipe

ABSTRACT
This specification covers UNS N06625, N06219, and N08825 nickel-alloy welded pipe in the annealed condition. The pipe shall be manufactured from flat-rolled alloy by an automatic welding process with no additional filler metal. The pipe material shall be cold-worked, annealed, and nondestructively tested. The pipe shall be furnished with oxide removed. The material shall conform to the composition required by the specification. The pipe shall be subjected to tensile, yield, elongation, transverse guided bend, and nondestructive test requirements. Nondestructive test includes hydrostatic, pneumatic, eddy current, ultrasonic, leak, and electric testing. Acceptable size limit of cracks or other defect after bending test is specified.
SCOPE
1.1 This specification covers welded UNS N06625,2 UNS N062192 and UNS N088252 pipe in the annealed condition (temper) for general corrosion applications.  
1.2 This specification covers pipe sizes in schedules shown in the Permissible Variations in Outside Diameter and Wall Thickness for Welded Pipe table of Specification B775.  
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 The following precautionary caveat pertains only to the test methods portion, Section 8, 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.  
1.5 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-Mar-2024
• ICS: 77.120.40 - Nickel, chromium and their alloys
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.07 - Refined Nickel and Cobalt and Their Alloys

Relations

• Replaces: ASTM B705-17 - Standard Specification for Nickel-Alloy (UNS N06625, N06219 and N08825) Welded Pipe
• Effective Date: 01-Apr-2024
• Referred By: ASTM B366/B366M-23 - Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings
• Effective Date: 01-Apr-2024
• Referred By: ASTM B775/B775M-22 - Standard Specification for General Requirements for Nickel and Nickel Alloy Welded Pipe
• Effective Date: 01-Apr-2024

Overview

ASTM B705-24 is the latest revision of the standard specification for welded pipe made from nickel-based alloys, including Nickel-Chromium-Molybdenum-Niobium, Nickel-Chromium-Molybdenum-Silicon, and Nickel-Iron-Chromium-Molybdenum-Copper alloys. This specification is primarily applicable to pipes made from UNS N06625, UNS N06219, and UNS N08825 alloys, designed for general corrosion applications. The standard outlines requirements for manufacturing, testing, and marking welded pipe supplied in the annealed condition, ensuring consistent quality for demanding environments.

Key Topics

• Alloy Coverage: Includes welded pipes made from UNS N06625, N06219, and N08825, offering superior corrosion resistance and mechanical properties.
• Manufacturing Methods:
  • Pipe is produced from flat-rolled nickel alloy using an automatic welding process, with no filler metal added.
  • Subsequent cold working is applied before final annealing.
  • Pipes are supplied with oxide removed; descaling is not required for bright annealed products.
• Product Classes and Grades:
  • Class 1: Welded, cold-worked, annealed, and nondestructively tested per section 9.1.
  • Class 2: Welded, cold-worked, annealed, and nondestructively tested per section 9.2.
  • Grade 1 and Grade 2: Applies specifically to UNS N06625 (annealed and solution annealed condition).
• Testing and Quality:
  • Pipes undergo chemical, mechanical, and nondestructive tests to verify requirements.
  • Required mechanical tests include tensile strength, yield strength, elongation, and flattening or bend tests.
  • Comprehensive nondestructive tests cover hydrostatic, pneumatic (air underwater), eddy current, ultrasonic, and electric methods.
• Product Marking and Ordering:
  • All pipes are marked according to ASTM requirements, including grade information for UNS N06625.
  • Purchasers must specify crucial details such as alloy, dimensions, class, grade, certifications, and quantity.

Applications

Welded pipes covered by ASTM B705-24 are widely used in industries where corrosion resistance and structural integrity are critical. Typical applications include:

• Chemical processing plants: Pipes convey highly corrosive fluids and gases.
• Oil and gas: Used in upstream, midstream, and downstream systems, especially in sour service and aggressive environments.
• Petrochemical and power generation: Suitable for heat exchangers, reactors, and pressure vessels requiring high-performance alloys.
• Desalination plants and marine environments: Ideal for piping systems exposed to seawater.
• Pharmaceutical and food processing: When purity and non-reactivity with process media are required.

The use of these nickel-alloy welded pipes is favored for their ability to withstand extreme conditions, ensuring long service lifecycles, lower maintenance, and improved safety.

Related Standards

For a comprehensive approach to specifying and utilizing nickel-alloy welded pipe, consider related standards:

• ASTM B775: Specifies general requirements for nickel and nickel-alloy welded pipe, referenced for permissible dimensional variations and marking.
• ASTM B880: Outlines procedures for chemical check analysis limits for nickel, nickel alloys, and cobalt alloys.
• ASTM B899: Provides terminology for non-ferrous metals and alloys.
• ASME Boiler and Pressure Vessel Code, Section IX: Offers guidance on welding and brazing qualifications, including procedures for guided bend tests.

Summary

ASTM B705-24 provides a detailed framework for the production and quality assurance of nickel-based alloy welded pipes, supporting high-performance applications where reliability and resistance to hostile environments are required. Adherence to this standard enables manufacturers, fabricators, and end-users to specify, procure, and verify materials with confidence, ensuring compliance with international engineering best practices.

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: B705 − 24
Standard Specification for
Nickel-Chromium-Molybdenum-Niobium Alloy, Nickel-
Chromium-Molybdenum-Silicon Alloy, and Nickel-Iron-
Chromium-Molybdenum-Copper Alloy Welded Pipe
This standard is issued under the fixed designation B705; 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* B880 Specification for General Requirements for Chemical
2 Check Analysis Limits for Nickel, Nickel Alloys and
1.1 This specification covers welded UNS N06625, UNS
2 2 Cobalt Alloys
N06219 and UNS N08825 pipe in the annealed condition
B899 Terminology Relating to Non-ferrous Metals and Al-
(temper) for general corrosion applications.
loys
1.2 This specification covers pipe sizes in schedules shown 4
2.2 ASME Boiler and Pressure Vessel Code:
in the Permissible Variations in Outside Diameter and Wall
Section IX Welding and Brazing Qualifications
Thickness for Welded Pipe table of Specification B775.
3. Terminology
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
3.1 Definitions:
conversions to SI units that are provided for information only
3.1.1 For definitions of terms used in this standard, refer to
and are not considered standard.
Terminology B899.
3.2 Definitions of Terms Specific to This Standard:
1.4 The following precautionary caveat pertains only to the
3.2.1 Class 1—Welded, cold-worked, annealed, and nonde-
test methods portion, Section 8, of this specification: This
structively tested in accordance with 9.1.
standard does not purport to address all of the safety concerns,
3.2.2 Class 2—Welded, cold-worked, annealed, and nonde-
if any, associated with its use. It is the responsibility of the user
structively tested in accordance with 9.2.
of this standard to establish appropriate safety, health, and
3.2.3 Grade 1—Annealed condition, relevant for UNS
environmental practices and determine the applicability of
N06625.
regulatory limitations prior to use.
3.2.4 Grade 2—Solution annealed condition, relevant for
1.5 This international standard was developed in accor-
UNS N06625.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. General Requirement
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical 4.1 Material furnished in accordance with this specification
Barriers to Trade (TBT) Committee. shall conform to the applicable requirements of the current
edition of Specification B775 unless otherwise provided
2. Referenced Documents
herein.
2.1 ASTM Standards:
5. Ordering Information
B775 Specification for General Requirements for Nickel and
Nickel Alloy Welded Pipe 5.1 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.
This specification is under the jurisdiction of ASTM Committee B02 on
Examples of such requirements include, but are not limited to,
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
the following:
B02.07 on Refined Nickel and Cobalt and Their Alloys.
Current edition approved April 1, 2024. Published April 2024. Originally
5.1.1 Alloy name or UNS number,
approved in 1982. Last previous edition approved in 2017 as B705 – 17. DOI:
5.1.2 ASTM designation,
10.1520/B0705-24.
2 5.1.3 Dimensions:
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 Available from American Society of Mechanical Engineers (ASME), ASME
Standards volume information, refer to the standard’s Document Summary page on International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
the ASTM website. www.asme.org.
*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
B705 − 24
TABLE 2 Mechanical Property Requirements
5.1.3.1 Pipe size,
5.1.3.2 Length (specific or random), Yield Elonga-
Tensile Strength tion in 2
5.1.4 Class (see Section 4),
Alloy Grade Strength 0.2 % Offset, in. or 50
5.1.5 Grade if UNS N06625 is specified. If neither grade of
min, psi (MPa) min, psi mm, min,
N06625 is specified, grade 1 will be supplied. (MPa) %
UNS N06625 1 (annealed) 120 000 (825) 60 000 (415) 30
5.1.6 Quantity (feet or number of pieces),
UNS N06625 2 (solution 100 000 (690) 40 000 (275) 30
5.1.7 Certification—State if certification is required,
A
annealed)
5.1.8 Samples for Product (Check) Analysis—State whether
UNS N06219 . 96 000 (660) 39 000 (270) 30
UNS N08825 . 85 000 (585) 35 000 (240) 30
samples for product (check) analysis should be furnished (7.2),
A
and Solution annealed at 2000 °F (1095 °C) minimum, with or without subsequent
stabilization anneal at 1800 °F (980 °C) minimum to increase resistance to
5.1.9 Purchaser Inspection—If purchaser wishes to witness
sensitization.
tests or inspection of material at place of manufacture, the
purchase order must so state indicating which tests or inspec-
tions are to be witnesses.
6. Material and Manufacture
8.2 Flattening Test—A section of pipe not less than 4 in.
(102 mm) in length shall be capable of withstanding, without
6.1 Pipe shall be made from flat-rolled alloy by an auto-
cracking, flattening under a load applied gradually at room
matic welding process with no addition of filler metal. Subse-
temperature until the distance between the platens is five times
quent to welding and prior to final annealing, the material shall
the wall thickness. The weld shall be positioned 90° from the
be cold-worked in either the weld metal only or both weld and
di
...

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: B705 − 17 B705 − 24
Standard Specification for
Nickel-Alloy (UNS N06625, N06219 and N08825)Nickel-
Chromium-Molybdenum-Niobium Alloy, Nickel-Chromium-
Molybdenum-Silicon Alloy, and Nickel-Iron-Chromium-
Molybdenum-Copper Alloy Welded Pipe
This standard is issued under the fixed designation B705; 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 2 2
1.1 This specification covers welded UNS N06625, UNS N06219 and UNS N08825 pipe in the annealed condition (temper)
for general corrosion applications.
1.2 This specification covers pipe sizes in schedules shown in the Permissible Variations in Outside Diameter and Wall Thickness
for Welded Pipe table of Specification B775.
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 The following precautionary caveat pertains only to the test methods portion, Section 8, 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.
1.5 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
2.1 ASTM Standards:
B775 Specification for General Requirements for Nickel and Nickel Alloy Welded Pipe
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
2.2 ASME Boiler and Pressure Vessel Code:
Section IX Welding and Brazing Qualifications
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, 2017April 1, 2024. Published November 2017April 2024. Originally approved in 1982. Last previous edition approved in 20142017 as
B705B705 – 17. – 05 (2014). DOI: 10.1520/B0705-17. DOI: 10.1520/B0705-24.
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.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
www.asme.org.
*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
B705 − 24
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this standard, refer to Terminology B899.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 Class 1—Welded, cold-worked, annealed, and nondestructively tested in accordance with 9.1.
3.2.2 Class 2—Welded, cold-worked, annealed, and nondestructively tested in accordance with 9.2.
3.2.3 Grade 1—Annealed condition, relevant for UNS N06625.
3.2.4 Grade 2—Solution annealed condition, relevant for UNS N06625.
4. General Requirement
4.1 Material furnished in accordance with this specification shall conform to the applicable requirements of the current edition of
Specification B775 unless otherwise provided herein.
4. Definition of Terms
4.1 Class 1—Welded, cold-worked, annealed, and nondestructively tested in accordance with 9.1.
4.2 Class 2—Welded, cold-worked, annealed, and nondestructively tested in accordance with 9.2.
4.3 Grade 1—Annealed condition, relevant for UNS N06625.
4.4 Grade 2—Solution annealed condition, relevant for UNS N06625.
5. Ordering Information
5.1 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:
5.1.1 Alloy name or UNS number,
5.1.2 ASTM designation,
5.1.3 Dimensions:
5.1.3.1 Pipe size,
5.1.3.2 Length (specific or random),
5.1.4 Class (see Section 34),
5.1.5 Grade if UNS N06625 is specified. If neither grade of N06625 is specified, grade 1 will be supplied.
5.1.6 Quantity (feet or number of pieces),
5.1.7 Certification—State if certification is required,
5.1.8 Samples for Product (Check) Analysis—State whether samples for product (check) analysis should be furnished (7.2), and
5.1.9 Purchaser Inspection—If purchaser wishes to witness tests or inspection of material at place of manufacture, the purchase
order must so state indicating which tests or inspections are to be witnesses.
B705 − 24
6. Material and Manufacture
6.1 Pipe shall be made from flat-rolled alloy by an automatic welding process with no addition of filler metal. Subsequent to
welding and prior to final annealing, the material shall be cold-worked in either the weld metal only or both weld and base metal.
6.2 Pipe shall be furnished with oxide removed. When bright annealing is used, descaling is not necessary.
7. Chemical Composition
7.1 The material shall conform to the composition limits specified in Table 1. One test per lot shall be performed.
7.2 If a product (check) analysis is performed by the purchaser, the material shall conform to the product (check) analysis
variations per Specification B880.
8. Mechanical Properties and Other Requirements
8.1 Mechanical Properties—The material shall conform to the mechanical properties specified in Table 2. One pipe per lot shall
be examined.
8.2 Flattening Test—A section of pipe not less than 4 in. (102 mm) in length shall be capable of withstanding, without cracking,
TABLE 1 Chemical Requirements
Composition Limits, %
UNS UNS UNS
N06625 N06219 N08825
A
Ni 58.0 min Bal 38.0–46.0
Cr 20.0–23.0 18.0-22.0 19.5–23.5
A
Fe 5.0 max 2.0-4.0 22.0 min
Mo 8.0–10.0 7.0-9.0 2.5 3.5
Cb + Ta 3.15–4.15 . .
C 0.10 max 0.05 max 0.05 max
Mn 0.50 max 0.50 max 1.0 max
Si 0.5 max 0.70-1.10 0.5 max
P 0.015 max 0.020 max .
S 0.01
...