ASME II A351-2010 pdf free download.SPECIFICATION FOR CASTINGS, AUSTENITIC, AUSTENITIC-FERRITIC (DUPLEX), FOR PRESSURE-CONTA INING PARTS.
1.1 This specification covers austenitic and austeniticferrule (duplex) steel castings for valves, flanges, fittings, and other pressure-containing parts (Note I).
NOTE 1 — Carbon steel castings For pressure-containing parts are covered by Specification A 216/A 216M. and low-alloy steel castings by Specification A 217/A 217M.
1.2 A number of grades of austenitic and austeniticferritic steel castings are included in this specification. Since these grades possess varying degrees of suitability for service at high temperatures or in corrosive environments, it is the responsibility of the purchaser to determine which grade shall be furnished. Selection will depend on design and service conditions, mechanical properties, and high-temperature or corrosion-resistant characteristics, or both.
1.2.1 Because of thermal instability, Grades CE2ON. CF3A. CF3MA. and CF8A are not recommended for service at temperatures above 800°F [425°C].
1.2.2 Because of embrittlement phases, Grade CD4MCu is not recommended for service at temperatures above 600°F [316°C].
1.3 The values stated in either inch-pound units or SI units are to he regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
2. Referenced Documents
2.1 ASTM Siandards:
A 216/A 2l6M Specification for Steel Castings. Carbon, Suitable for Fusion Welding, for High-Temperature Service
hot tears. Other surface discontinuities shall meet the visual acceptance standards specified in the order. Visual Method SP 55 or other visual standards may be used to define acceptable surface discontinuities and finish. Unacceptable rjsual surface discontinuities shall be removed and their removal verified by visual examination of the resultant cavities.
9.2 When additional inspection is desired. Supplementary Requirements S5, S6. and SlO may be ordered.
9.3 The castings shall not be peened. plugged. or impregnated to stop leaks.
10. Repair by Welding
10.1 Repairs shall he made using procedures and welders qualified under Practice A 488/A 488M.
10.2 Weld repairs shall be inspected to the same quality standards that are used to inspect the castings. When castings are produced with Supplementary Requirement S5 specified. weld repairs on castings that have leaked on hydrostatic test, or on castings in which the depth of any cavity prepared for repair welding exceeds 20% of the wall thickness or 1 in. [25 mmj. whichever is smaller, or on castings in which any cavity prepared for welding is greater than approximately 10 in.2 [65 cm2], shall be radiographed to the same standards that are used to inspect the castings. When castings are produced with Supplementary Requirement S6 specified, weld repairs shall be inspected by liquid penetrant examination to the same standards that are used to inspect the castings.
NOTE 3 — When austenitic steel castings are to be used in services where they will be subject to siress corrosion, the purchaser should so indicate in his order and such castings should be solution-heat treated following all weld repairs.
11. Keywords
11.1 austenitic stainless steel; duplex stainless steel:
pressure containing parts; stainless steel: steel castings.