ASTM A420 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service

ASTM A420 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service

ASTM A420 Standard Specification covers wrought carbon steel and alloy steel fifittings of seamless and welded construction, covered by the latest revision of ASME B 16.9, ASME B 16.11, MSS-SP-79, MSS-SP-83, and MSS-SP-95. Fittings differing from these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specififi- cation A 960/A 960M. These fifittings are for use in pressure piping and pressure vessel service at low temperatures. 

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

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. 

The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other.