A871 Grade 65 Type Ⅳ - ASTM A871/A871M-2020

Grade	A871 Grade 65 Type Ⅳ
Corresponding Standard	ASTM A871/A871M-2020 High-Strength Low-Alloy Structural Steel Plate With Atmospheric Corrosion Resistance
Classification	Alloy Steel

A871 Grade 65 Type Ⅳ Chemical Element Composition Content (%)

Component	C ^①	Si	Mn ^①	P	S	Cr	Ni	Cu	Mo	Nb ^②
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

① 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 %.
② For plates under 1/2 in. (13 mm) in thickness, the minimum columbium is waived.

A871 Grade 65 Type Ⅳ Mechanical Properties

Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Impact Energy Absorption KV2 J
≥550	≥450	(50mm) ≥17	-29°C: ≥20

• The yield point σs here refers to Rp0.2 or Rt0.5: as stipulated in A370, it is determined by the 0.2% residual deformation method or the 0.5% tensile elongation method.

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