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ASME SA302 Grade B steel plate and SA204 Grade B steel plate with Mo alloy
Source:Steel Industry   Date:2021/03/28

SA204 Grade B steel plate is one kind Molybdenum alloy steels in ASME SA204/SA204M specification, and SA302 Grade B steel plate is one kind Manganese-Molybdenum alloy steels in ASME SA302/SA302M specification.These two steel grades are both for boiler and pressure vessel building usage.SA302 Grade B steel plate requires a higher Mn% in chemical composition than SA204 Grade B steel plate,for Mo% alloy steel elements,they are the same as 0.45-0.6%.SA302 Grade B steel plate owned a higher yield strength (Min.345 Mpa) and tensile strength (550-690 Mpa) than SA204 Grade B steel plate.


For heat treatment,SA204 Grade B steel plate have to be done Normalized treatment for plate thickness over 40mm,however SA302 Grade B steel plate requires Normalized treatment for thickness over 50mm.Actually we supplying SA204 Grade B steel plate and SA302 Grade B steel plate with Normalized heat treatment even for thickness range 5-40mm for guarantee good property.

 

SA302 Gr.B vs SA204 Gr.B

Chemical composition: Heat Analysis  Max%

Standard

Grade

C

Mn

P

S

Si

Cu

Ni

Cr

Mo

ASME SA302/SA302M

SA302 Gr.B

0.20

0.85-1.20

0.025

0.025

0.15-0.40

-

-

-

0.45-0.6

ASME SA204/SA204M

SA204 Gr.B

0.20

0.90

0.035

0.035

0.15-0.40

-

-

-

0.45-0.6

Mechanical Properties:

Thickness

Yield strength

Tensile strength

Mpa  Min.

Mpa

ASME SA302/SA302M

SA302 Gr.B

ALL

345

550-690

ASME SA204/SA204M

SA204 Gr.B

ALL

275

485-620