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ASTM A403 WP316L Pipe Fittings

ASTM A Standard specification covers the standard for wrought austenitic stainless steel fittings for pressure piping applications.

The material for fittings shall consist of forgings, bars, plates, or seamless or a4403 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.


Asrm 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.

Tension test shall be done on the fitting material to determine the tensile properties such as yield strength and tensile strength. Fittings supplied under this specification shall be examined visually for surface discontinuities, surface checks, and mechanical marks.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; asstm full text of the standard itself must be referred to for its use and application. 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.

Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination NDE. Table 1 is a general summary of the fitting classes applicable to all WP grades of stainless steel covered by this specification.


ASTM A WP Pipe Fittings| ASTM A WP

There are no classes for the CR grades. Specific requirements are covered elsewhere.

Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each asstm shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

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