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ASTM A542 Grade D Class 4a alloy steel plates for pressure vessels

ASTM A542 Grade D Class 4a alloy steel plates for pressure vessels

A542 Grade D Class 4a in the standard A-542/A-542M is a kind of Mo-V alloy steel plates material used to fabric high temperature pressure vessels. A542 have Five grades or levels. They are : grade A, grade B, grade C, grade D, grade E . A542 Grade D Class 4a need to be done the (Quenching + Tempering ) heat-treatment to meet the property requirement in the standard ASTM A-542/A-542M.

Key words:A542 Grade D Class 4a,ASTM A542 Grade D Class 4a,A542 Grade D Class 4a steel plate,ASTM A542 Grade D Class 4a high tensile alloy steel plates,ASTM A542 Grade D Class 4a for fabric high temperature pressure vessels

ASTM A542 Grade D Class 4a steel chemical composition:

Composition

Grade B

C

Heat analyse

0.11~0.15

Product analyse

0.09~0.18

Mn

Heat analyse

0.30~0.60

Product analyse

0.25~0.66

P ≤

Heat analyse

0.015

Product analyse

0.020

S ≤

Heat analyse

0.010

Product analyse

0.015

Si ≤

Heat analyse

0.010

Product analyse

0.013

Ni ≤

Heat analyse

0.25

Product analyse

0.28

Cr

Heat analyse

2.00~2.50

Product analyse

1.08~2.62

Mo

Heat analyse

0.90~1.10

Product analyse

0.85~1.15

B

Heat analyse

0.0022

Product analyse

-

V

Heat analyse

0.25-0.35

Product analyse

0.23-0.37

Ti

Heat analyse

≤0.030

Product analyse

≤0.035

Ca②

 

≤0.015

 

≤0.020

Cu≤

Heat analyse

0.20

Product analyse

0.25

Nb

Heat analyse

≤0.07

Product analyse

≤0.08

Note : ① In A 542/A 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.

ASTM A542 Grade D Class 4a steel mechanical properties :

Tensile strength ksi(Mpa)

85-110(585-760)

Yield strength , Min , ksi(Mpa)

55(380)

Elongation 2in(50mm),%,A

20

Shanghai Royal Industry is a professional ASTM A542 steel stockist and supplier. We can supply different product type of ASTM A542. If you have any need of ASTM A542 steel please do not hesitate to contact us .

Related link :

ASTM A542 Grade A

Class 1

Class 2

Class 3

Class 4

ASTM A542 Grade B

Class 1

Class 2

Class 3

Class 4

ASTM A542 Grade C

Class 1

Class 2

Class 3

Class 4

ASTM A542 Grade D

Class 1

Class 2

Class 3

Class 4

Class 4a

ASTM A542 Grade E

-

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