A320 L7B - ASTM A320/A320M-2024(a)

Grade	A320 L7B
AISI American Iron and Steel Institute	4137
Corresponding Standard	ASTM A320/A320M-2024(a) Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
Classification	Alloy Steel

A320 L7B Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Mo
Minimum Value	0.35	0.15	0.7	-	-	0.8	0.15
Maximum Value	0.4	0.35	0.9	0.035	0.04	1.1	0.25

A320 L7B Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Quenching and Tempering, Minimum Tempering Temperature 593℃	≥860	≥725	≥16	≥50	HBW：≤321 or HRC：≤35

A320L7B Corresponding Standards(Same grade name, different standards)

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