A number in parentheses indicates the year of last reapproval. The acceptance of any such additional requirements shall bedependent on negotiations with the supplier and must beincluded in the order as agreed upon by the purchaser andsupplier. Within the text andthe tables, the SI units are shown in brackets. The values statedin each system may not be exact equivalents; therefore eachsystem shall be used independently of the other.
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It covers the butt-welded pipe fittings of Elbow, Tee, Reducer, Cap and Cross, and some socket welding, threaded pipe fittings. These pipe fittings used in pressure pipelines and pressure vessel fabrication for servic at moderate and increased temperatures.
Materials and Manufacturing The raw material for making ASTM A fittings hall be fully killed, consisting of forgings, bars, plates, sheet, and seamless or fusion-welded pipe products with filler metal added and shall conform to the chemical requirements of Table 1.
Unless specified for carbon steel plates or sheet, the steel may be made to either coarse grain or fine grain practice. Forgings or forming operations could be perfomred by hammering, pressing, piercing, upseting, rolling, extruding, bending, fusion welding, machining, or by a combination of two or more above operations. Which the point of manufacturing is not to produce injurious imperfections in the fittings.
B Fittings made from steel plate or bar may require 0. C In case made from forgings may have 0. D For each reduce of 0. F Applies both to heat and product analyses. Mechanical Properties: Elongation Heat Treatment ASTM A ASME SA pipe fittings after shaping from an elevated temperature, shall be cooled down to a temperature below critical range under suitable conditions which preventing injurious defects caused by too rapid cooling, but in no case more rapidly than the cooling rate in still air.
NPS4 hot forged fittings no need to be heat treated. Fittings over NPS12, produced by locally heating a portion of the fitting stock to any temperature for forming, shall be annealed, normalized, or normalized and tempered. And these fittings inlcudes elbow, tee, reducers, the carbon content shall les than 0. NPS12 under no need to be heat treated under this forming process. Hardness A minimum of two pieces per batch or continuous run shall be hardness tested to ensure fittings of each grade comply with Table 2.
The retest shall be conducted in accordance with over 6. Silicon to 1. Hardness Requirements over 3. Tensile Requirements over Tantalum to 0. The tension test specimen over 5. Aluminum to 0.
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