ASTM A181 Standard Specification for Carbon Steel Forgings, for General-Purpose Piping

ASTM A181 Standard Specification for Carbon Steel Forgings, for General-Purpose Piping

1.1 ASTM A181 Standard Specification covers nonstandard as-forged fifittings, valve components, and parts for general service. Forgings made to this specifification are limited to a maximum weight of 10 000 lb [4540 kg]. Larger forgings may be ordered to Specifification A266/A266M. 

1.2 Two classes of material are covered, designated as Classes 60 and 70, respectively, and are classifified in accordance with their mechanical properties as specifified in 6.1. 

1.3 This specifification is expressed in both inch-pound units and SI units. However, unless the order specififies the applicable “M” specifification designation (SI units), the material shall be furnished to inch-pound units. 

1.4 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. Combining values from the two systems may result in nonconformance with the specifification.