ASME II A351:2010 pdf free download SPECIFICATION FOR CASTINGS, AUSTENITIC, AUSTENITIC-FERRITIC (DUPLEX), FOR PRESSURE-CONTAINING PARTS
1.Scope
1.1This specification covers austenitic and austenitic-ferritic (duplex) steel castings for valves, flanges, fittings,and other pressure-containing parts (Note 1).
NOTE1—Carbon steel castings for pressure-containing parts are coveredby Specification A 216/A 216M, and low-alloy steel castings by Specifi-cation A 217IA 217M.
1.2A number of grades of austenitic and austenitic-ferritic steel castings are included in this specification.Since these grades possess varying degrees of suitabilityfor service at high temperatures or in corrosive environ-ments, it is the responsibility of the purchaser to determinewhich grade shall be furnished. Selection will depend ondesign and service conditions. mechanical properties, andhigh-temperature or corrosion-resistant characteristics，orboth.
1.2.1 Because of thermal instability, Grades CE20N,CF3A,CF3MA, and CF8A are not recommended for ser-vice at temperatures above 800°F[425°C].
1.2.2Because of embrittlement phases，GradeCD4MCu is not recommended for service at temperaturesabove 600°F[316°C].
1.3The values stated in either inch-pound units or SIunits are to be regarded separately as standard. Within thetext, the Sl units are shown in brackets.The values statedin each system are not exact equivalents;therefore, eachsystem must be used independently of the other.Combiningvalues from the two systems may result in nonconformancewith the specification.
2.Referenced Documents2.1 ASTM Standards:
A 216/A 216M Specification for Steel CastingsCarbon,Suitable for Fusion Welding, for High-TemperatureService
A 217/A 217M Specification for Steel Castings，Marten-sitic Stainless and Alloy, for Pressure-Containing Parts,Suitable for High-Temperature Service
A488/A 488M Practice for Steel Castings, Welding, Quali-fication of Procedures and Personnel
A 703/A 703M Specification for Steel Castings，GeneralRequirements, for Pressure-Containing Parts
E 165 Test Method for Liquid Penetrant ExaminationE 709 Guide for Magnetic Particle Examination
2.2 Manufacturers Standardization Society of the Valveand Fittings Industry Standard:
SP-55 Quality Standard for Steel Castings for Valves,Flanges，and Fittings and Other Components (VisualMethod)
3.General Conditions for Delivery
3.1 Material furnished to this specification shall con-form to the requirements of Specification A 703/A 703M,including any supplementary requirements that are indi-cated in the purchase order. Failure to comply with thegeneral requirements of Specification A 703/A 703M con-stitutes nonconformance with this specification. In case ofconflict between the requirements of this specification andSpecification A 703/A 703M, this specification shallprevail.
3.2 The post weld heat treatment requirements of Sup-plementary Requirement S11 may be specified when aus-tenitic castings other than HK, HT, or CT15C are to besubjected to severe corrosive service.
4.Ordering Information
4.1The inquiry and order should include or indicatethe following:
4.1.1 A description of the casting by pattern numberor drawing (dimensional tolerances shall be included onthe casting drawing).
4.1.2 Grade of steel,
4.1.3 Options in the specification,and
4.1.4 Supplementary requirements desired, includingthe standards of acceptance.
5.Process
5.1The steel shall be made by the electric furnaceprocess with or without separate refining such as argon-oxygen decarburization (AOD).
6.Heat Treatment
6.1All castings shall receive a heat treatment at thetemperature specified in Table 1,followed by a quench inwater or rapid cool by other means except as noted.
NOTE 2 —Proper heat treatment of these alloys is usually necessaryto enhance corrosion resistance and in some cases to meet mechanicalproperties.Minimum heat-treat temperatures are specified; however,itis sometimes necessary to heat-treat at higher temperatures, hold for someminimum time at temperature and then rapidly cool the castings in orderto enhance the corrosion resistance and meet mechanical properties.
7. Chemical Composition
7.1The steel shall conform to the requirements as tochemical composition prescribed in Table 2.
8.Tensile Properties
8.1Steel used for the castings shall conform to therequirements as to tensile properties prescribed in Table 3.
9.Quality
9.1The surface of the casting shall be examined visu-ally and shall be free of adhering sand,scale,cracks, and
ASME II A351:2010 pdf free download
