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Home > ASME > ASME SA542 Grade D Class 4a alloy steel plates for pressure vessels

ASME SA542 Grade D Class 4a alloy steel plates for pressure vessels

SA542 Grade D Class 4a in the standard SA-542/SA-542M is a kind of Mo-V alloy steel plates material used to fabric high temperature pressure vessels. SA542 have Five grades or levels. They are : grade A, grade B, grade C, grade D, grade E . SA542 Grade D Class 4a need to be done the (Quenching + Tempering ) heat-treatment to meet the property requirement in the standard ASME SA-542/SA-542M.

Key words:SA542 Grade D Class 4a,ASME SA542 Grade D Class 4a,SA542 Grade D Class 4a alloy steel plates,SA542 Grade D Class 4a Mo-V alloy steel plates,ASME SA542 Grade D Class 4a alloy steel plates for fabric high temperature pressure vessels.

ASME SA542 Grade D Class 4a steel chemical composition:

Composition		Grade B
C	Heat analyse	0.11~0.15
C	Product analyse	0.09~0.18
Mn	Heat analyse	0.30~0.60
Mn	Product analyse	0.25~0.66
P ≤	Heat analyse	0.015
P ≤	Product analyse	0.020
S ≤	Heat analyse	0.010
S ≤	Product analyse	0.015
Si ≤	Heat analyse	0.010
Si ≤	Product analyse	0.013
Ni ≤	Heat analyse	0.25
Ni ≤	Product analyse	0.28
Cr	Heat analyse	2.00~2.50
Cr	Product analyse	1.08~2.62
Mo	Heat analyse	0.90~1.10
Mo	Product analyse	0.85~1.15
B	Heat analyse	0.0022
B	Product analyse	-
V	Heat analyse	0.25-0.35
V	Product analyse	0.23-0.37
Ti	Heat analyse	≤0.030
Ti	Product analyse	≤0.035
Ca②	Heat analyse	≤0.015
Ca②	Product analyse	≤0.020
Cu≤	Heat analyse	0.20
Cu≤	Product analyse	0.25
Nb	Heat analyse	≤0.07
Nb	Product analyse	≤0.08

Note : ① In SA 542/SA 542M-82 standard and the earlier standard, the steel plates whose thickness ≤ 125mm, C must be ≤ 0.15%
② Ca can be replace by REM as the agreement with manufacturer and buyer, if like this, then the total amount of REM should be stated.

ASME SA542 Grade D Class 4a steel mechanical properties :

Tensilestrengthksi（Mpa）	85-110（585-760）
Yieldstrength,Min,ksi（Mpa）	55（380）
Elongation2in（50mm），%，A	20

Shanghai Royal Industry is a professional ASME SA542 steel stockist and supplier. We can supply different product type of ASME SA542. If you have any need of ASME SA542 steel please do not hesitate to contact us .

ASME SA542 GradeA	Class1		Class2		Class3		Class4
ASME SA542 GradeB	Class1		Class2		Class3		Class4
ASME SA542 GradeC	Class1		Class2		Class3		Class4
ASME SA542 GradeD	Class1	Class2		Class3		Class4		Class4a
ASME SA542 GradeE	-

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