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ASTM A671/A671M-20(2025)

Standard Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures
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This specification covers standard requirements for electric-fusion-welded steel pipe with filler metal added, for atmospheric and lower temperatures.

The steel pipe shall be fabricated from a pressure vessel quality plate of several analysis and strength levels. Several grades and classes of pipe shall be provided.

Grade shall designate the type of plate used while class shall designate the type of heat treatment performed during pipe manufacture. Class shall be designated as to whether the weld is radiographically examined, and as to whether the pipe is pressure tested.

Steel samples shall undergo tension and transverse guided weld bend tests and conform to the specified mechanical requirements.

1.1 This specification2 covers electric-fusion-welded steel pipe with filler metal added, fabricated from pressure vessel quality plate of several analyses and strength levels and suitable for high-pressure service at atmospheric and lower temperatures.

Heat treatment may or may not be required to attain the desired properties or to comply with applicable code requirements.

Supplementary requirements are provided for use when additional testing or examination is desired.

1.2 The specification nominally covers pipe 16 in. [400 mm] in outside diameter or larger and of 1/4 in. [6 mm] wall thickness or greater.

Pipe having other dimensions may be furnished provided it complies with all other requirements of this specification.

1.3 Several grades and classes of pipe are provided.

1.3.1 Grade designates the type of plate used as listed in 5.1.

1.3.2 Class designates the type of heat treatment performed during manufacture of the pipe, whether the weld is radiographically examined, and whether the pipe has been pressure tested as listed in 1.3.3.

1.3.3 Class designations are as follows (Note 1):

  • Class 10: none (heat treatment), none (radiography), none (pressure test)
  • Class 11: none (heat treatment), radiography per Section 9, none (pressure test)
  • Class 12: none (heat treatment), radiography per Section 9, pressure test per Section 8.3
  • Class 13: none (heat treatment), none (radiography), pressure test per Section 8.3
  • Class 20: stress relieved, see 5.3.1; none (radiography), none (pressure test)
  • Class 21: stress relieved, see 5.3.1; radiography per Section 9, none (pressure test)
  • Class 22: stress relieved, see 5.3.1; radiography per Section 9, pressure test per Section 8.3
  • Class 23: stress relieved, see 5.3.1; none (radiography), pressure test per Section 8.3
  • Class 30: normalized, see 5.3.2; none (radiography), none (pressure test)
  • Class 31: normalized, see 5.3.2; radiography per Section 9, none (pressure test)
  • Class 32: normalized, see 5.3.2; radiography per Section 9, pressure test per Section 8.3
  • Class 33: normalized, see 5.3.2; none (radiography), pressure test per Section 8.3
  • Class 40: normalized and tempered, see 5.3.3; none (radiography), none (pressure test)
  • Class 41: normalized and tempered, see 5.3.3; radiography per Section 9, none (pressure test)
  • Class 42: normalized and tempered, see 5.3.3; radiography per Section 9, pressure test per Section 8.3
  • Class 43: normalized and tempered, see 5.3.3; none (radiography), pressure test per Section 8.3
  • Class 50: quenched and tempered, see 5.3.4; none (radiography), none (pressure test)
  • Class 51: quenched and tempered, see 5.3.4; radiography per Section 9, none (pressure test)
  • Class 52: quenched and tempered, see 5.3.4; radiography per Section 9, pressure test per Section 8.3
  • Class 53: quenched and tempered, see 5.3.4; none (radiography), pressure test per Section 8.3
  • Class 70: quenched and precipitation heat treated; none (radiography), none (pressure test)
  • Class 71: quenched and precipitation heat treated; radiography per Section 9, none (pressure test)
  • Class 72: quenched and precipitation heat treated; radiography per Section 9, pressure test per Section 8.3
  • Class 73: quenched and precipitation heat treated; none (radiography), pressure test per Section 8.3

Note 1: Selection of materials should be made with attention to temperature of service.

For such guidance, Specification A20/A20M may be consulted.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard.

Within the text, the SI units are shown in brackets.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Combining values from the two systems may result in non-conformance with the standard.

The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.

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.

SDO ASTM: ASTM International
Document Number A671
Publication Date Sept. 1, 2025
Language en - English
Page Count 7
Revision Level 20(2025)
Supercedes
Committee A01.09
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