ASTM A351-2018 pdf free download

ASTM A351-2018 pdf free download.Standard Specification for Castings, Austenitic, for Pressure-Containing Parts
1. Scope
1.1 This specification 2 covers austenitic steel castings for valves, flanges, fittings, and other pressure-containing parts (Note 1). N OTE 1—Carbon steel castings for pressure-containing parts are cov- ered by Specification A216/A216M, low-alloy steel castings by Specifi- cation A217/A217M, and duplex stainless steel castings by Specification A995/A995M. 1.2 A number of grades of austenitic 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. Selec- tion 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 CE20N, CF3A, CF3MA, and CF8A are not recommended for service at temperatures above 800 °F [425 °C]. 1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. The Supple- mentary requirements shall apply only when specified indi- vidually by the purchaser in the purchase order or contract. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values 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-conformance with the standard. 1.4.1 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M-specification designation (SI units), the inch-pound units shall apply. Within the text, the SI units are shown in brackets or parentheses.1.5 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. General Conditions for Delivery
3.1 Other Than Investment Castings—Material furnished to this specification shall conform to the requirements of Speci- fication A703/A703M, including any supplementary require- ments that are indicated in the purchase order. Failure to comply with the general requirements of Specification A703/ A703M constitutes nonconformance with this specification. In case of conflict between the requirements of this specification and Specification A703/A703M, this specification shall pre- vail. 3.2 Investment Castings—Material furnished to this specifi- cation shall conform to the requirements of Specification A985/A985M, including any supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements of Specification A985/A985M consti- tutes nonconformance with this specification. In case of con- flict between the requirements of this specification and Speci- fication A985/A985M, Specification A985/A985M shall prevail. 3.3 The post-weld heat treatment requirements of Supple- mentary Requirement S50 may be specified when austenitic castings other than HK, HT, or CT15C are to be subjected to severe corrosive service.
9. Quality
9.1 The surface of the casting shall be examined visually and shall be free of adhering sand, scale, cracks, and 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 visual surface discon- tinuities 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 S10 may be ordered. 9.3 The castings shall not be peened, plugged, or impreg- nated to stop leaks.