【国外标准】 Standard Specification for Steel Investment Castings General Requirements, for Pressure-Containing Parts

This specification covers a group of common requirements that are mandatory for steel castings produced by the investment casting process for pressure-containing parts. Master heats shall be made by the electric furnace process with or without separate refining such as argon-oxygen-decarburization (AOD), vacuum-oxygen degassing (VOD), vacuum-induction-melting (VIM). Ferritic and martensitic steel shall be cooled after pouring to provide complete transformation of austenite prior to heat treatment to enhance mechanical properties. Chemical, heat, and product analyses shall be performed and the chemical composition thus determined shall conform to the prescribed values in carbon, manganese, silicon, phosphorus, sulfur, nickel, chromium, molybdenum, vanadium, tungsten, copper, and aluminum. Tensile testing shall be done on the castings and shall meet the required yield and tensile strength, elongation, and reduction of area. Each casting shall also be tested after machining to hydrostatic shell pressure test and shall not show any leaks.1.1 This specification covers a group of common requirements that are mandatory for steel castings produced by the investment casting process for pressure-containing parts under each of the following ASTM Specifications:  Title of Specification ASTM Designation     Steel Castings, Carbon, Suitable for Fusion Welding, A216/A216M  for High-Temperature Service  Steel Castings, Martensitic Stainless and Alloy, for A217/A217M  Pressure-Containing Parts, Suitable for High-    Temperature Service  Castings, Austenitic, for Pressure-Containing A351/A351M  Parts  Steel Castings, Ferritic and Martensitic, for Pressure- A352/A352M  Containing Parts, Suitable for Low-Temperature    Service  Steel Castings, Alloy, Specially Heat-Treated, for A389/A389M  Pressure-Containing Parts, Suitable for High-    Temperature Service  Steel Castings Suitable for Pressure Service A487/A487MCastings, Iron-Nickel-Chromium and Nickel Alloys, Spe-     cially Controlled for Pressure-Retaining Parts for     Corrosive Service A990/A990MCastings, Austenitic-Ferritic (Duplex) Stainless Steel, for     Pressure-Containing Parts A995/A995M1.2 This specification also covers a group of supplementary requirements, which may be applied to the above specifications as indicated therein. These requirements are provided for use when additional testing or inspection is desired, and apply only when specified individually by the purchaser in the order.1.3 When investment casting is ordered, the requirements of this specification shall take precedence over the individual material specification requirements.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 nonconformance with the standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.