A841 Grades A Class 1 - ASTM A841/A841M-2017

Grade	A841 Grades A Class 1
Corresponding Standard	ASTM A841/A841M-2017 Steel Plates for Pressure Vessels, Produced by ThermoMechanical Control Process (TMCP)
Classification	Alloy Steel

A841 Grades A Class 1 Chemical Element Composition Content (%)

	Component	C	Si	Mn ^①	P	S	Cr	Ni	Cu	Mo	V	Nb	Al ^②	More
t≤40mm	Minimum Value	-	0.15	0.7	-	-	-	-	-	-	-	-	0.02	Alt≥0.02 or Als≥0.015
t≤40mm	Maximum Value	0.2	0.5	1.35	0.03	0.03	0.25	0.25	0.35	0.08	0.06	0.03	-	Alt≥0.02 or Als≥0.015

	Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	V	Nb	Al ^②	More
t＞40mm	Minimum Value	-	0.15	1	-	-	-	-	-	-	-	-	0.02	Alt≥0.02 or Als≥0.015
t＞40mm	Maximum Value	0.2	0.5	1.6	0.03	0.03	0.25	0.25	0.35	0.08	0.06	0.03	-	Alt≥0.02 or Als≥0.015

① Manganese may exceed 1.35 % on heat analysis, up to a maximum of 1.60 %, provided that the carbon equivalent on heat analysis does not exceed 0.47 %, or the value specified in Supplementary Requirement S77 when that requirement is invoked, when based on the following formula：
CE = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15%
When this option is exercised, the manganese content on product analysis shall not exceed the heat analysis content by more than 0.12 percentage points.
② By agreement, the steel may be produced with titanium, in which case the minimum aluminum content shall not apply. When this option is exercised, the titanium content, by heat analysis, shall be .006 % to 0.02 %, and the actual titanium content shall be reported on the test report.

A841 Grades A Class 1 Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %
t≤65	485~620	≥345	L0=50mm：≥22 L0=200mm: ≥18
t＞65	450~585	≥310	L0=50mm：≥22 L0=200mm: ≥18

L0-gauge lengh

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