A588 Grade K - ASTM A588/588M-2019

Grade	A588 Grade K
Corresponding Standard	ASTM A588/588M-2019 High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance
Classification	Alloy Steel

A588 Grade K Chemical Element Composition Content (%)

Component	C ^①	Si	Mn ^①	P ^②	S ^②	Cr	Ni	Cu	Mo	Nb
Minimum Value	-	0.25	0.5	-	-	0.4	-	0.3	-	0.005
Maximum Value	0.17	0.5	1.2	0.03	0.03	0.7	0.4	0.5	0.1	0.05

A588 Grade K Mechanical Properties

	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %
Bars, Plates; t≤100mm	≥485	≥345	（in 50mm） ≥21
Bars, Plates; 100mm＜t≤125mm	≥460	≥315	≥21
Bars, Plates; 125mm＜t≤200mm	≥435	≥290	≥21
Section Steel; all	≥485	≥345	≥21

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