ASTM A387 / A387M Grade 21

Chemical Properties

Carbon	Manganese	Phosphorus,max	Sulfur,max	Silicon	Chromium	Molybdenum

Mechanical Properties

Tensile strength,min: ksi [MPa]	Yield strength, min, ksi [MPa]/(0.2 % offset)	Elongation in 8 in. [200 mm] min, %A	Elongation in 2 in. [50 mm] min, %A	Reduction of area, min, %

Note: A Elongation in 2 in. [50 mm] using a standard round specimen, in either the transverse or longitudinal direction. Note: B See Specification A20/A20M, elongation adjustments. Note: C Measured on round test specimens.

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