ASTM A234 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

ASTM A234 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

1.1 ASTM A234 Standard Specification covers wrought carbon steel and alloy steel fifittings of seamless and welded construction covered by the latest revision of ASME B16.9, B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, and MSS-SP-97. These fifittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures. Fittings differing from these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specififi- cation A960/A960M. 

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

1.3 This specifification does not cover cast welding fifittings or fifittings machined from castings. Cast steel welding fifittings are governed by Specififications A216/A216M and A217/A217M. 1.4 This specifification is expressed in both inch-pound units and in SI units. However, unless the order specififies the applicable “M” specifification designation (SI units), the material shall be furnished to inch-pound units. 

1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.