【国外标准】 Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications

This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications. If the primary melting is required it shall incorporate separate degassing or refining and may be followed by secondary melting, such as electroslag remelting or vacuum remelting. If secondary melting is employed, the heat shall be defined as all of the ingot remelted from a single primary heat. Material requiring heat treatment shall be treated as specified in the individual product specification using the following procedures such as full annealing, solution annealing, isothermal annealing, normalizing, tempering and post-weld heat treatment, stress relieving. Heat analysis shall be used to determine the percentages of carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, tantalum, copper, cobalt, nitrogen, aluminum, vanadium, cerium to meet the required chemical composition. The product analysis shall be used to determine if the chemical composition shall conform to the limits of the product specified. Mechanical tests shall be performed to determine the mechanical properties such as hardness, tensile properties, and impact properties.1.1 This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications under any of the following individual product specifications:Title of Specification ASTM Designation   Forgings, Carbon Steel, for Piping Components A105/A105MForgings, Carbon Steel, for General-Purpose Piping A181/A181MForged or Rolled Alloy-Steel Pipe Flanges, Forged A182/A182M  Fittings, and Valves and Parts for High Temperature  Service  Forgings, Carbon and Low Alloy Steel, Requiring Notch A350/A350M  Toughness Testing for Piping Components  Forged or Rolled 8 and 9 % Nickel Alloy A522/A522M  Steel Flanges, Fittings, Valves, and Parts    for Low-Temperature Service  Forgings, Carbon and Alloy Steel, for Pipe Flanges, A694/A694M  Fittings, Valves, and Parts for High-Pressure  Transmission Service  Flanges, Forged, Carbon and Alloy Steel for Low A707/A707M  Temperature Service  Forgings, Carbon Steel, for Piping Components with A727/A727M  Inherent Notch Toughness  Forgings, Titanium-Stabilized Carbon Steel, for A836/A836M  Glass-Lined Piping and Pressure Vessel Service  1.2 In case of conflict between a requirement of the individual product specification and a requirement of this general requirement specification, the requirements of the individual product specification shall prevail over those of this specification.1.3 By mutual agreement between the purchaser and the supplier, additional requirements may be specified (see Section 4.1.2). The acceptance of any such additional requirements shall be dependent on negotiations with the supplier and must be included in the order as agreed upon between the purchaser and supplier.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text and the tables, the SI units are shown in brackets. 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. The inch-pound units shall apply, unless the “M” designation (SI) of the product specification is specified in the order.1.5 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.