Purchase your copy of ASTM A/AM – 14 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. ASTM A – This specification covers “as-welded” stainless steel pipe fittings for low pressure piping intended for low to moderate temperatures and general. ASTM A/AM: STANDARD SPECIFICATION FOR AS-WELDED WROUGHT AUSTENITIC STAINLESS STEEL FITTINGS FOR GENERAL CORROSIVE.
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This specification covers two general classes, WP and CR, of wrought austenitic stainless steel fittings of seamless and welded construction a74 by the latest revision of ANSI B Combining values from the two systems aatm result in nonconformance with the specification. Normally furnished in square cut ends, fittings with beveled ends can be provided.
Combining values from the two systems may result in non-conformance with the standard. These supplementary requirements call for additional tests. Class WP fittings are subdivided into four subclasses: Normally furnished in square cut ends, pipe with beveled ends can be provided. This 7a74 covers five grades of as-welded, wrought austenitic stainless steel fittings for low-pressure piping and for low and moderate temperatures and general a7774 service.
The fittings shall be formed by a hot or cold process and shall be welded by a shielded welding process with or without the addition of filler metal.
Users should note that certain corrosive conditions may restrict the use of one or more grades. However, unless the order specifies the applicable “M” specification designation SI unitsthe material shall be furnished to inch-pound units. Fittings are normally furnished in MSS SP dimensions, with square cut ends, fittings with beveled ends can be provided.
The principal manufacturing procedures specified under A are: Although no restrictions are made on sizes commercial practice is usually above NPS8.
As-welded pipe is commonly used when no mechanical testing of the finished product is required. A fittings is commonly use in the Pulp and Paper mills, food processing plants, and other industries where corrosion resistance is essential. Wall thickness may nor be mode than.
ASTM A774/A774M – 14
As-Welded fittings are usually used where corrosion resistance is essential. Automatic welding process with or without addition of filler wire. Hydrostatic or non-destructive electric test of each tube.
Table 1 and Table 2 list the common diameters and nominal thicknesses of fittings in this specification. When desired, one or more of these may be specified in the order.
Welded elbows can be supplied as smooth flow or mitered construction, tees, lateral and crosses are supplied as nozzle-welded. Wall thickness may not be more than. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete xstm up to date. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for atm use and application.
This process of welding allows the company to supply a large range of thickness and diameters. Fittings differing from these standard may be furnished in accordance with Supplementary Requirement S9.
Class WP-S fittings are those manufactured from seamless product by a seamless method of manufacture marked with class symbol WP-S ; Class WP-W fittings contain welds made with or without filler metal. A is considered to be the most applicable specification for “as welded” fittings. Reducers are supplied as conical.
The steel materials shall also undergo mechanical tests and shall conform to the required wstm of tensile strength, yield strength, elongation, and hardness. The fittings shall be made from flat-rolled steel which shall be in the solution annealed condition. Class WP-W fittings contain welds made with or without filler metal. These supplementary requirements call for additional tests.
Historical Version s – view previous versions of standard. No nondestructive testing is performed and the fittings are unannealed.
Douglas Barwick – Specifications
A is considered to be the most applicable specification for “as welded” pipe and differs from it only that a transverse guided bend test and a transverse tension test are required per lot. Pipe or fitting fabrications made with a74 metal have been radiographed marked with Class symbol WP-W. The values stated in each system axtm not be exact equivalents; therefore, each system shall be used independently of the other. Within the text, the SI units are shown in brackets. Tension, Reverse, forward-bend and hardness tests of each lot.