ASTM A588 / A588M Grade K

Chemical Properties

CarbonA	ManganeseA	Phosphorus	Sulfur	Silicon	Nickel	Chromium	Molybdenum	Copper	Columbium
0.17 max	0.50–1.20	0.04 max	0.05 max	0.25–0.50	0.40 max	0.40–0.70	0.10 max	0.30–0.50	0.005–0.05B

Note: A For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50 %.

B For plates under 1⁄2 in. [13 mm] in thickness, the minimum columbium is waived.

Mechanical Properties

Product Form	Thickness	Tensile strength,min: ksi [MPa]	Yield strength,min: ksi [MPa]	Elongation in 8 in. [200 mm] min, %	Elongation in 2 in. [50 mm] min, %
Plates and Bars
	For Thicknesses 4 in. [100 mm] and Under	70 [485]	50 [345]	18B,C	21B,C
	For Thicknesses Over 4 in. [100 mm] to 5 in. [125 mm] incl	67 [460]	46 [315]	...	21B,C
	For Thicknesses Over 5 in. [125 mm] to 8 in.[200 mm] incl	63 [435]	42 [290]	...	21B,C
Structural Shapes	All	70 [485]	50 [345]	18C	21D

Note: A specimen orientation under the Tension Tests section of Specification A6/A6M.

B Elongation not required to be determined for floor plate.

C For plates wider than 24 in. [600 mm], the elongation requirement is reduced two percentage points.

D For wide flange shapes with flange thickness over 3 in. [75 mm], elongation in 2 in. [50 mm] of 18 % minimum applies.

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