More A The material for fittings shall consist of forgings, bars, plates, or seamless or welded tubular products. Forging or shaping operations shall be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of two or more of these operations. All fittings shall undergo heat-treatment. Chemical and product analyses shall be performed and shall conform to the required chemical composition in carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, and titanium.
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Olets Material The material used for the pipe fittings shall be the forgings, bars, plates, seamless or welded tubular products specified in the chemical composition table. Smelting Steel should be smelted using one of the following methods: a.
Electric furnace with separate and refining optional b. Vacuum furnace c. One of the former followed by vacuum remelting or electroslag- consumable electrode remelting d. If secondary melting are used, the furnace number refers to all steel ingots remelted with one smelting furnace number.
Manufacture Forming The forging or forming operation may be performed by hammer forging, press forging, perforating, extrusion, upsetting, rolling, bending, welding or machining, or two or more methods at the same time.
The forming process should ensure that no harmful defects are produced on the pipe fittings. Heat treatment For H grade steel, separate solution heat treatment are required for solution annealing.
All pipe fittings should be supplied in heat treated condition. All welding work should be done before heat treatment. Fitting that have been machined directly from solution annealed forgings and bar stocks do not need to be annealed again. Chemical Composition The chemical composition of each cast or furnace steel shall be determined and shall comply with the chemical composition requirements for each grade of material listed in the chemical composition table.
Tensile Properties The tensile properties of the pipe fitting materials shall comply with the tensile properties requirements. Tests and reports shall be conducted in accordance with A methods and definitions. For tensile testing, longitudinal or transverse cut specimens should be acceptable.
Although tensile properties Table specifies the elongation requirements for the longitudinal and transverse specimens, it is not intended to be applicable at the same time. Instead, This intent that only the corresponding elongation requirements for specimens that are applicable in the direction are appropriate. Surface Finish Pipe fittings supplied in accordance with this standard shall be visually inspected. The depth of a typical surface discontinuity should be measured.
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