A320 L72 - ASTM A320/A320M-2018

Grade	A320 L72
AISI American Iron and Steel Institute	4137
Corresponding Standard	ASTM A320/A320M-2018 Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service
Classification	Alloy Steel

A320 L72 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

Note: Except as specified, intentional addition of Bi, Se, Te, and Pb is not permitted.

A320 L72 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

A320L72 Corresponding Standards(Same grade name, different standards)

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!