【国外标准】 Standard Specification for Common Requirements for Wrought Steel Piping Fittings

This specification covers the common requirements that shall apply to wrought steel piping fittings. The material shall consist of forgings, bars, plates, and seamless or welded tubular products. Ferritic steels shall be fully killed. Hollow cylindrically shaped parts up to and including NPS 4 may be machined from bar or seamless tubular material. Elbows, return bends, tees, and header tees shall not be machined directly from bar stock. The following procedures shall be done for heat treatment: full annealing, solution annealing, isothermal annealing, normalizing, tempering and post-weld heat treatment, stress relieving, and quench and temper. Chemical analysis, heat analysis, and product analysis shall also be done. The chemical requirements shall conform to the required compositions of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, vanadium, columbium, titanium, aluminum, lead, and copper. The following tests shall be done for the mechanical requirements: tension, hardness, impact, and hydrostatic tests.1.1 This specification covers a group of common requirements that shall apply to wrought steel piping fittings covered in any of the following individual product specifications or any other ASTM specification that invokes this specification or portions thereof:Title of Specification ASTMDesignationSpecification for Piping Fittings of Wrought  Carbon Steel and Alloy Steel for Moderate and  High Temperature Service A234/A234MSpecification for Wrought Austenitic Stainless  Steel Piping Fittings A403/A403MSpecification for Piping Fittings of Wrought Carbon  Steel and Alloy Steel for Low-Temperature Service A420/A420MSpecification for Wrought-Carbon Steel Butt-Welding  Piping Fittings with Improved Notch Toughness A758/A758MSpecification for As-Welded Wrought Austenitic  Stainless Steel Fittings for General Corrosive  Service at Low and Moderate Temperatures A774/A774MSpecification for Wrought Ferritic, Ferritic/Austenitic,  and Martensitic Stainless Steel Piping Fittings A815/A815MSpecification for Heat-Treated Carbon Steel  Fittings for Low-Temperature and Corrosive Service A858/A858MSpecification for Wrought High-Strength  Ferritic Steel Butt-Welding Fittings A860/A860M1.2 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 4.1.8). 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 by 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 specification. 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.