1.1 This specification covers heat-treated carbon-manganese-silicon steel plates intended for fusion welded pressure vessels and structures.
1.2 Plates furnished under this specification are available in the following three classes:
Yield | Tensile | |||
Strength, | Strength, | |||
Heat | Thickness, | min, ksi | min, ksi | |
Class | Treatment | [MPa] | [MPa] | |
1 | Normalized | 2½ in. and under [65 mm and under] | 50 [345] | 70 [485] |
Over 2½ to 4 in. [Over 65 to 100 mm] | 45 [310] | 65 [450] | ||
2 | Quenched and tempered | 2½ in. and under [65 mm and under] | 60 [415] | 80 [550] |
Over 2½ to 4 in. [Over 65 to 100 mm] | 55 [380] | 75 [515] | ||
Over 4 to 6 in. [Over 100 to 150 mm] | 46 [315] | 70 [485] | ||
3 | Quenched and tempered | 2½ in. and under [65 mm and under] | 55 [380] | 80 [550] |
Over 2½ to 4 in. [Over 65 to 100 mm] | 50 [345] | 75 [515] | ||
Over 4 to 6 in. [Over 100 to 150 mm] | 40 [275] | 70 [485] |
1.3 The ......
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