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Description / Abstract:
This specification2 covers steel castings for valves,
flanges, fittings, and other pressurecontaining parts intended
primarily for lowtemperature service.
Eight 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
hardenabil. ity of some of the grades mentioned may restrict the
maximum size at which the required mechanical properties are
obtainable (see Appendix XI).
NoTE 1-This specification covers the low-temperature
requirements particularly pertinent for ferritic and martensitic
steels. Certain of the grades of austenitic steel castings
furnished in accordance with Specification A 351 have been found
suitable for lowtemperature service down to -300°F (-l84°C) and
others down to —425 0 f (—254 0c) .These
grades may be used when impact tested in accordance with this
specification A 352 with energy levels and temperatures
temperatures of test mutually agreed upon between the purchaser and
the manufacturer. As a guide to the selection of energy levels and
testing temperatures, Appendix Xl should be consulted.
The values stated in inch-pound units are to be regarded as the
standard.
2 For ASME Boiler and Pressure V esse! Code
applications,