ASTM A352/A352M-2006 pdf free download.Standard Specification for Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts, Suitable for Low-Temperature Service.
1. 1 This specification covers steel castings for valves, s:
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). The temperature S 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 hardenahility of some of the grades mentioned may restrict the maximum size at which the required mechanical properties are obtainable (see Appendix Xl).
5. Heat Treatment
5.1 All castings shall receive a heat treatment proper to their design and chemical composition. It should be recognized that liquid quenching of the ferritic grades is normally required to meet the mechanical properties of heavier sections and will greatly enhance the low-temperature properties of thinner sections.
5.2 Ferritic castings shall be furnished in the normalized and tempered or liquid-quenched and tempered condition, except for Grade LC9. which shall be liquid-quenched and tempered. Castings shall be tempered at a minimum of 1100°F [590°C], except Grade LC4, which shall be 1050°F [565°C], and Grade LC9. which shall be tempered in the range of 1050 to 1175°F [565 to 635°C], followed by cooling in air or liquid.
5.3 CA6NM castings shall be heat-treated by heating to
1850°F 11010°C] minimum, and air cooling to 200°F 195°C] maximum before any optional intermediate temper, hut shall cool to 100°F [40°C] maximum before the final temper. which shall be between 1050 and 1150°F 1565 and 620°C].
5.4 Castings shall be allowed to cool below the transformahon range directly after pouring and solidification before they are reheated for normalizing or liquid quenching.
5.5 Temperature Control—Furnace temperature for heat treating shall he controlled by use of pyrometers.
6. Chemical Composition
6. 1 The steel shall conform to the requirements as to chemical composition for the grade ordered as specified in Table I.
7. Mechanical Requirements
7. 1 Tension Test:
7.1.1 Tensile properties of steel used for the castings shall conform to the requirements specified in Table 1.
7.2 Impact l’est:
7.2.1 The notched bar impact properties of the material shall be determined by testing a set of three Charpy V-notch impact specimens for each heat at one of the standard test temperatures shown in Table I, depending Ofl the intended service temperature (see Appendix XI). The average energy value of the three specimens shall not be less than specified, with not more than one value permitted below the average minimum specified and no value permitted below the minimum specified for a single specimen.
7.2.2 The notched bar impact test shall be made in accordance with Test Methods and Definitions A370.ASTM A352/A352M pdf download.