This specification covers low-alloy steels and martensitic stainless steels in the normalized and tempered, or quenched and tempered, condition suitable for pressurecontaining parts. The weldability of the classes in this specification varies from readily weldable to weldable only with adequate precautions, and the weldability of each class should be considered prior to assembly by fusion welding.
| Grade and Class | Type |
|---|---|
| Grade 1 Type A | Vanadium |
| Grade 1 Type B | |
| Grade 1 Type C | |
| Grade 2 Type A | Manganese - Molybdenum |
| Grade 2 Type B | |
| Grade 2 Type C | |
| Grade 4 Type A | Nickel - Chromium - Molybdenum |
| Grade 4 Type B | |
| Grade 4 Type C | |
| Grade 4 Type D | |
| Grade 4 Type E | |
| Grade 6 Type A | Manganese Nickel - Chromium - Molybdenum |
| Grade 6 Type B | |
| Grade 7 Type A | Nickel - Chromium - Molybdenum - VanadiumA |
| Grade 8 Type A | Chromium - Molybdenum |
| Grade 8 Type B | |
| Grade 8 Type C | |
| Grade 9 Type A | Chromium - Molybdenum |
| Grade 9 Type B | |
| Grade 9 Type C | |
| Grade 9 Type D | |
| Grade 9 Type E | |
| Grade 10 Type A | Nickel - Chromium - Molybdenum |
| Grade 10 Type B | |
| Grade 11 Type A | |
| Grade 11 Type B | |
| Grade 12 Type A | |
| Grade 12 Type B | |
| Grade 13 Type A | Nickel - Molybdenum |
| Grade 13 Type B | |
| Grade 14 Type A | |
| Grade 16 Type A | Low Carbon Manganese - Nickel |
| Grade CA15 Type A | Martensitic Chromium |
| Grade CA15 Type B | |
| Grade CA15 Type C | |
| Grade CA15 Type D | |
| Grade CA15M Type A | |
| Grade CA6MN Type A | Martensitic Chromium Nickel |
| Grade CA6MN Type B |