ASTM A234

Description / Abstract: This specification² covers wrought carbon steel and alloy steel fittings of seamless and welded construction covered by the latest revision of ANSI B16.9,ANSI B16.1,ANSI B16.28, and MSS SP-79. These fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures. Fittings differing from these ANSI and MSS standards shall be furnished in accordance with Supplementary Requirement S9.

Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. When desired, one or more of these supplementary requirements may be specified in the order.

This specification does not cover cast welding fittings or fittings machined from castings: Cast steel welding fittings are governed by Specifications A 216 and A 217.

The values stated in inch-pound units are to be regarded as the standard. The metric equivalents may be approximate.

² For ASME Boiler and Pressure Vessel Code applications see related Specification SA-234 in Section II of that Code.