This specification covers one grade of martensitic stainless steel and several grades of ferritic steel castings for cylindrical (shells), valve chests, throttle valves, and other heavy-walled castings for steam turbine applications. The steel shall be made by the open-hearth or electric-furnace process. Deoxidation of the carbon and low-alloy steel grades shall be by manganese and silicon. The castings shall be heat treated in either the normalized, tempered, or stress-relieved conditions. Mechanical properties such as tensile strength, yield strength, and elongation shall be determined by subjecting the specimens to a tension test.
1.1 This specification covers one grade ofmartensitic stainless steel and several grades of ferritic steelcastings for cylinders (shells), valve chests, throttle valves, andother heavy-walled castings for steam turbine applications.
1.2 Optional supplementary requirements (S1 throughS5) shall apply as selected by and specified by the purchaser.
1.3 The values stated in either SI units orinch-pound units are to be regarded separately as standard. Thevalues 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-conformancewith the standard.
1.3.1 Within the text, the SI units are shown inbrackets.