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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Users should note that certain corrosive conditions may restrict the use of one or more grades. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Asstm 1 and Table 2 list the common diameters and nominal thicknesses of fittings in this specification. Class WP-W fittings contain welds made with or without filler metal. When desired, one or more of these may be specified in the order.


A is considered to be the most applicable specification for “as welded” fittings. Users should note that certain corrosive conditions may restrict the use of one or more grades.

Carbide solution heat treatment is required which include rapid cooling to prevent re-precipitation of carbides. Tension, Reverse, forward-bend and hardness tests of each lot. Special fittings can be supplied to customer design and size when required. Class WP-S fittings are those manufactured from seamless product by a seamless method of manufacture marked with class symbol WP-S. A product analysis of both the weld metal and base metal after annealing.

No nondestructive testing is performed and the fittings are unannealed. ASTM A This specification covers seamless and welded austenitic stainless steel tubing intended for the low or high temperature and general corrosion service. Class WP fittings are subdivided into four subclasses: Within the text, the SI units are shown in brackets.


Base metal analysis are traceable to the original mill certificates. The A manufacturing process is suited to high-volume production and is generally limited to the diameters and schedule wall thickness shown in ANSI B This specification covers five grades of as-welded, wrought austenitic stainless steel fittings for low-pressure piping and for low and moderate temperatures and general corrosive service. The fittings shall be made from flat-rolled steel which shall be in the solution annealed condition.

ASTM A Fittings This specification covers welded unannealed aztm fittings intended for low to moderate temperatures and corrosion service where heat treatment is atm required for corrosion resistance. Automatic welding process with no addition of filler wire. Heat analysis and product analysis shall be performed where in the steel fittings shall conform to the required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, columbium, asgm, and nitrogen.

Pipe or fitting fabrications made with filler metal have been radiographed marked with Class symbol WP-W. Combining values from the two systems may result in non-conformance with the standard.

Pipe is pickled and passivated as per ASTM A to maintain corrosion resistance and to prevent surface discoloration from free iron oxidation. These supplementary requirements call for additional tests.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Although no restrictions are made on sizes commercial practice is usually above NPS8.

With no nondestructive testing required.

ASTM A774 Grade TP316L

All material is furnished in the heat treated condition and bead rolling is excluded in our process. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. The values stated in each system are not exact equivalents; therefore, each system a7774 be used independently of the other. Wall thickness may not be more than Combining values from the two systems may result in nonconformance with the specification.


The fittings shall be formed by a hot or cold process and shall be aetm by a shielded welding process with or without the addition of filler metal. Aastm, unless the order specifies the applicable “M” specification designation SI unitsthe material shall be furnished to inch-pound units. Specially ashm can be ordered A pipe with immediately deliver available from a complete inventory standard sizes up to 24″.

These supplementary requirements call for additional tests. Reducers are supplied as conical. Hydrostatic or non-destructive electric test of each tube.

Douglas Barwick – Specifications

This abstract is a brief summary of the referenced standard. Automatic welding process with the addition of filler wire. Welded elbows can be supplied as smooth flow or mitered construction, tees, lateral and crosses are supplied as nozzle-welded. Tension, Flattening, Flange test, adtm and hardness tests required each lot.

This specification covers two general classes, WP and CR, of wrought austenitic stainless steel fittings of seamless and welded construction covered by the latest revision of ANSI B Fittings differing from these astmm may be furnished in accordance with Supplementary Requirement S9. How to Find Us.

Wall thickness may not asfm more than. The term “fittings” applies to butt and socket welding parts such as 45 and 90 elbows, tees, reducers, wyes, laterals, crosses, and stub ends.