A320 L43 - ASTM A320/A320M-2021

Grade	A320 L43
AISI American Iron and Steel Institute	4340
Corresponding Standard	ASTM A320/A320M-2021 Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
Classification	Alloy Steel

A320 L43 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo
Minimum Value	0.38	0.15	0.6	-	-	0.7	1.65	0.2
Maximum Value	0.43	0.35	0.85	0.035	0.04	0.9	2	0.3

A320 L43 Mechanical Properties

Heat Treatment or Condition	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW
Quenching and Tempering, Minimum Tempering Temperature 593℃	≥860	≥725	≥16	≥50	≤321

1 Approximate Comparison Table structural alloy steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
34CrNi3Mo 34CrNiMo ZG34CrNiMo	SNCM447	4340	36CrNiMo6	34CrNiMo6 GS-34CrNiMo6V	35NCD6	34CrNiMo6	1.6582	36KH2N2MFA 38KH2N2MA 40KHN2MA	2541	817M40

2 Approximate Comparison Table cast steel

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
ZG34CrNiMo 34CrNi3Mo 34CrNiMo	SNCM447	4340	36CrNiMo6	GS-34CrNiMo6V 34CrNiMo6	35NCD6	34CrNiMo6	1.6582	36KH2N2MFA 38KH2N2MA 40KHN2MA	2541	817M40

A320L43 Corresponding Standards(Same grade name, different standards)

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