ASTM A691 / A691M
This specification covers carbon and alloy steel pipe, electric-fusion-welded with filler metal added, fabricated from pressure-vessel-quality plate of several analyses and strength levels and suitable for high-pressure service at high temperatures. Heat treatment may or may not be required to attain the desired mechanical properties or to comply with applicable code requirements. Supplementary requirements are provided for use when additional testing or examination is desired. The specification nominally covers pipe 16 in. [400 mm] in outside diameter and larger with wall thicknesses up to 3 in. [75 mm] inclusive. Pipe having other dimensions may be furnished provided it complies with all other requirements of this specification.
| Pipe Grades | Type of Steel | ASTM Grades | HB,maxA |
|---|---|---|---|
| CM-65 | Carbon-Molybdenum Steel | A204/A204M Grade A | 201 |
| CM-70 | Carbon-Molybdenum Steel | A204/A204M Grade B | 201 |
| CM-75 | Carbon-Molybdenum Steel | A204/A204M Grade C | 201 |
| CMSH-70 | Carbon-Manganese-Silicon Steel,Normalized | A537/A537M | - |
| CMS-75 | Carbon-Manganese-Silicon Steel | A299/A299M | - |
| CMSH-80 | Carbon-Manganese-Silicon Steel,Quenched and Tempered | A537/A537M Grade 2 | - |
| 1/2 CR | 1/2 % Chromium,1/2 % Molybdenum Steel | A387/A387M Grade 2 | 201 |
| 1 CR | 1 % Chromium,1/2 % Molybdenum Steel | A387/A387M Grade 12 | 201 |
| 1 1/4 CR | 1 1/4 % Chromium,1/2 % Molybdenum Steel | A387/A387M Grade 11 | 201 |
| 2 1/4 CR | 2 1/4 % Chromium,1 % Molybdenum Steel | A387/A387M Grade 22 | 201 |
| 3 CR | 3 % Chromium,1 % Molybdenum Steel | A387/A387M Grade 21 | 201 |
| 5 CR | 5 % Chromium,1/2 % Molybdenum Steel | A387/A387M Grade 5 | 225 |
| 9 CR | 9 % Chromium,1/2 % Molybdenum Steel | A387/A387M Grade 9 | 241 |
| 91 | 9 % Chromium,1/2 % Molybdenum,Vanadium,Columbian | A387/A387M Grade 91 | 241 |
