1.1 This specification2 covers steel castings for valves, flanges, fittings, and other pressure-containing parts intended primarily for low-temperature service.
1.2 Several grades of ferritic steels and one grade of martensitic steel are covered. Selection of analysis will depend on design and service conditions (Note 1). The temperature shown is the lowest temperature at which the material ordinarily is required to meet the impact requirements of this specification (see Supplementary Requirement S22, Impact Test Temperatures). Users should note that hardenability of some of the grades mentioned may restrict the maximum size at which the required mechanical properties are obtainable (see Appendix X1).
| Grade | Usual Minimum Testing |
| LCA | −25 [–32] |
| LCB | −50 [–46] |
| LCC | −50 [–46] |
| LC1 | −75 [–59] |
| LC2 | −100 [–73] |
| LC2–1 | −100 [–73] |
| LC3 | −150 [–101] |
| LC4 | −175 [–115] |
| LC9 | −320 [–196] |
| CA6NM | −100 [−73] |