ASTM B674 - 21

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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*

1.1 This speciﬁcation covers UNS N08925,

UNS N08354,

and UNS N08926 welded tube for general corrosion applica-

tions.

1.2 This speciﬁcation covers outside diameter and nominal

wall tube.

1.2.1 The tube sizes covered by this speciﬁcation are

⁄

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 speci-

ﬁcation 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 accor-

dance with internationally recognized principles on standard-

ization established in the Decision on Principles for the

Development of International Standards, Guides and Recom-

mendations 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

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 inspec-

tions 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 auto-

matic welding process with no addition or ﬁller metal. Subse-

quent 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.

NOTE 1—The recommended heat treatment shall consist of heating to a

temperature of 1975 to 2150°F (1080 to 1180°C) for UNS N08354 or

2010 to 2100°F (1100 to 1150°C) for UNS N08925 and UNS N08926,

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 April 1, 2021. Published April 2021. Originally

approved in 1980. Last previous edition approved in 2016 as B674 – 05 (2016).

DOI: 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

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.

followed by quenching in water or rapid cooling by other means.

4.2 Tube shall be furnished with oxide removed. When

bright annealing is used, descaling is not necessary.

5. Chemical Composition

5.1 The material shall conform to the composition limits

speciﬁed in Table 1. One test is required for each lot as deﬁned

in Speciﬁcation B751.

5.2 If a product analysis is performed, it shall meet the

chemistry limits prescribed in Table 1, subject to the analysis

tolerances of Speciﬁcation B751.

6. Mechanical and Other Properties

6.1 Mechanical Properties—The material shall conform to

the mechanical property requirements speciﬁed in Table 2. One

test is required for each lot as deﬁned in Speciﬁcation B751.

6.2 Flattening Test—A ﬂattening test shall be made on each

end of one tube per lot. Superﬁcial ruptures resulting from

surface imperfections shall not be cause for rejection.

6.3 Flange Test—A ﬂange test shall be made on each end of

one tube per lot.

6.4 Nondestructive Test Requirements:

6.4.1 Class 1—Each piece in each lot shall be subject to one

of the following four tests: hydrostatic, pneumatic (air

underwater), eddy current, or ultrasonic.

6.4.2 Class 2—Each piece in each lot shall be subjected to

a leak test and an electric test as follows:

6.4.2.1 Leak Test—Hydrostatic or pneumatic (air underwa-

ter).

6.4.2.2 Electric Test—Eddy current or ultrasonic.

6.5 The manufacturer shall have the option to test to Class

1 or 2 and select the nondestructive test methods, if not

speciﬁed by the purchaser.

7. General Requirements

7.1 Material furnished under this speciﬁcation shall con-

form to the applicable requirements of the current edition of

Speciﬁcation B751 unless otherwise provided herein.

8. Keywords

8.1 UNS N08354; UNS N08925; UNS N08926; welded

tube

TABLE 1 Chemical Requirements

Element UNS N08925 UNS N08354 UNS N08926

Carbon, max 0.020 0.030 0.020

Manganese, max 1.00 1.00 2.00

Phosphorus, max 0.045 0.030 0.03

Sulfur, max 0.030 0.010 0.01

Silicon, max 0.50 1.00 0.5

Nickel 24.0 to 26.0 34.0 to 36.0 24.00 to 26.00

Chromium 19.0 to 21.0 22.0 to 24.0 19.00 to 21.00

Molybdenum 6.0 to 7.0 7.0 to 8.0 6.0 to 7.0

Copper 0.8 to 1.5 ... 0.5 to 1.5

Nitrogen 0.1 to 0.2 0.17 to 0.24 0.15 to 0.25

Iron balance balance balance

TABLE 2 Mechanical Properties

Alloy Temper Tensile Strength, min,

psi (MPa)

Yield Strength, 0.2 %

offset, min, psi (MPa)

Elongation in 2 in. or

50 mm (or 4D), min, %

UNS N08925 solution annealed 87 (600) 43 (295) 40

UNS N08354 solution annealed 93 (640) 43 (295) 40

UNS N08926 solution annealed 94 (650) 43 (295) 35

B674 − 21

SUMMARY OF CHANGES

Committee B02 has identiﬁed the location of selected changes to this standard since the last issue (B674 – 05

(2016)) that may impact the use of this standard. (Approved April 1, 2021.)

(1) Removed UNS numbers in title and added alloy

descriptors.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned

in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk

of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ﬁve years and

if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards

and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the

responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should

make your views known to the ASTM Committee on Standards, at the address shown below.

This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,

United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above

address or at 610-832-9585 (phone), 610-832-9555 (fax), or service@astm.org (e-mail); or through the ASTM website

(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222

Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http://www.copyright.com/

B674 − 21

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摘要：

ASTM B674 - 21 是美国材料与试验协会发布的最新版本标准规范，专门针对 UNS N08926 (也称为 Alloy 926 或 25-6Mo) 的焊接管材制定。该标准涵盖此类高镍、高钼、高氮奥氏体不锈钢的化学成分、力学性能、尺寸公差与制造工艺要求，确保产品在海水冷却、化学加工、烟气脱硫等强腐蚀环境中具备优异的抗点蚀、缝隙腐蚀和应力腐蚀开裂性能。遵循 ASTM B674 - 21 的管材可用于热交换器、冷凝器与流体输送系统，本规范还补充了无损检测、热处理与出厂检验的相关内容，是采购、质

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ASTM B674 - 21

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