This specification deals with carbon and alloy steel forgings (including gas bottles) for use in thin-walled pressure vessels. Covered here are the following grades of steel forgings: Grade A; Grade B; Grade C; Grade D; Grade E, Classes 55, 65, and 70; Grade F, Classes 55, 65, and 70; Grade G, Classes 55, 65, and 70; Grade H, Classes 55, 65, and 70; Grade J, Classes 55, 65, and 70; Grade K; Grade L; Grade J, Class 110; and Grade M, Classes 85 and 100. Materials shall be manufactured by melting procedures, and optionally heat treated by normalization, normalization and tempering, or liquid-quenching and tempering. Heat and product analyses shall be performed wherein steel specimens shall conform to required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, and vanadium. Steel materials shall also undergo bending, flattening and hardness tests and shall conform to required values of tensile strength, yield strength, elongation, and hardness. Forgings shall be subjected to magnetic particle examination as well.
Область применения1.1 This specification2 covers relatively thin-walled forgings (including gas bottles) for pressure vessel use. Three types of carbon steel and six types of alloy steel are included. Provision is made for integrally forging the ends of vessel bodies made from seamless pipe or tubing.
| Current | Formerly |
| Grade A | Type I |
| Grade B | Type II |
| Grade C | Type III |
| Grade D | Type IV |
| Grade E Class 55 | Type V Grade 1 Class 55 |
| Grade E Class 65 | Type V Grade 1 Class 65 |
| Grade E Class 70 | Type V Grade 1 Class 70 |
| Grade F Class 55 | Type V Grade 2 Class 55 |
| Grade F Class 65 | Type V Grade 2 Class 65 |
| Grade F Class 70 | Type V Grade 2 Class 70 |
| Grade G Class 55 | Type V Grade 3 Class 55 |
| Grade G Class 65 | Type V Grade 3 Class 65 |
| Grade G Class 70 | Type V Grade 3 Class 70 |
| Grade H Class 55 | Type V Grade 4 Class 55 |
| Grade H Class 65 | Type V Grade 4 Class 65 |
| Grade H Class 70 | Type V Grade 4 Class 70 |
| Grade J Class 55 | Type V Grade 5 Class 55 |
| Grade J Class 65 | Type V Grade 5 Class 65 |
| Grade J Class 70 | Type V Grade 5 Class 70 |
| Grade K | Type VI |
| Grade L | Type VII |
| Grade J Class 110 | Type VIII |
| Grade M Class 85 | Type IX Class A |
| Grade M Class 100 | Type IX Class B |
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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.
1.3 Unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
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