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ASTM A126 Standard specification for gray iron castings for Valves, Flanges and Pipe fittings

This specification covers three classes of gray iron for castings for pipe fittings and flanges

Tensile Requirements


Class A

Class B

Class C

Tensile strength, min, ksi (MPa)

21 (145)

31 (214)

41 (283)

ASTM A48 Equivalent grades

NO. 25

NO.30, 35

NO. 40

The castings shall be made in a workmanlike manner and the surface shall be free of adhering sand, scale, cracks, and hot tears as determined by visual examination. 

A chemical analysis shall be performed on each lot and shall conform to the following requirements for phosphorus Max. 0.75% and sulfur Max. 0.15%.

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