ASTM A 671/A671M : 2020
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01-03-2020
1.1This 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.
1.2The 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.
1.3Several grades and classes of pipe are provided.
1.3.1Grade designates the type of plate used as listed in 5.1.
1.3.2Class 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.
1.3.3Class designations are as follows (Note 1):
| Class | Heat Treatment on Pipe | Radiography, see Section | Pressure Test, see: |
| 10 | none | none | none |
| 11 | none | 9 | none |
| 12 | none | 9 | 8.3 |
| 13 | none | none | 8.3 |
| 20 | stress relieved, see 5.3.1 | none | none |
| 21 | stress relieved, see 5.3.1 | 9 | none |
| 22 | stress relieved, see 5.3.1 | 9 | 8.3 |
| 23 | stress relieved, see 5.3.1 | none | 8.3 |
| 30 | normalized, see 5.3.2 | none | none |
| 31 | normalized, see 5.3.2 | 9 | none |
| 32 | normalized, see 5.3.2 | 9 | 8.3 |
| 33 | normalized, see 5.3.2 | none | 8.3 |
| 40 | normalized and tempered, see 5.3.3 | none | none |
| 41 | normalized and tempered, see 5.3.3 | 9 | none |
| 42 | normalized and tempered, see 5.3.3 | 9 | 8.3 |
| 43 | normalized and tempered, see 5.3.3 | none | 8.3 |
| 50 | quenched and tempered, see 5.3.4 | none | none |
| 51 | quenched and tempered, see 5.3.4 | 9 | none |
| 52 | quenched and tempered, see 5.3.4 | 9 | 8.3 |
| 53 | quenched and tempered, see 5.3.4 | none | 8.3 |
| 70 | quenched and precipitation heat treated | none | none |
| 71 | quenched and precipitation heat treated | 9 | none |
| 72 | quenched and precipitation heat treated | 9 | 8.3 |
| 73 | quenched and precipitation heat treated | none | 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.
1.4The 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.
1.5This 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.
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