ASTM A738Grade B is a kind of C-Mn-Si steel plates material used to fabric middle or low temperature pressure vessels. Obviously, A738 is divided into three grades or levels :A738 Gr. A, A738 Gr. B, A738 Gr. C . In order to meet the property requirement of ASTMSA-738/SA-738M standard, this material must be done heat-treatment.
Key words: A738Grade B,ASTM A738Grade B,A738Grade B C-Mn-Si steel plates,A738Grade B for fabric middle or low temperature pressure vessels,A738Grade B Hot Rolled Boiler Plate.
ASTM A738Grade B steel chemical composition (%) :
|
Compostion |
A738 Grade B |
||
|
C ≤ ① |
0.20 |
||
|
Mn |
Heat analyse |
Thickness ≤65mm |
0.90~1.50 |
|
Thickness＞65mm |
0.90~1.60 |
||
|
Product analyse |
Thickness ≤65mm |
0.84~1.62 |
|
|
Thickness＞65mm |
0.84~1.72 |
||
|
P ≤ ① S ≤ ① |
0.030 |
||
|
Si |
Heat analyse |
0.15~0.50 |
|
|
Product analyse |
0.13~0.60 |
||
|
Cu ≤ |
Heat analyse |
0.35 |
|
|
Product analyse |
0.38 |
||
|
Ni ≤ |
Heat analyse |
0.60 |
|
|
Product analyse |
0.63 |
||
|
Cr ≤ |
Heat analyse |
0.30 |
|
|
Product analyse |
0.34 |
||
|
Mo ≤ |
Heat analyse |
Thickness ≤40mm |
0.20 |
|
Thickness＞40mm |
0.30 |
||
|
Product analyse |
Thickness ≤40mm |
0.21 |
|
|
Thickness＞40mm |
0.33 |
||
|
V ≤ |
Heat analyse |
0.07 |
|
|
Product analyse |
0.08 |
||
|
Nb ≤ |
Heat analyse |
0.04 |
|
|
Product analyse |
0.05 |
||
|
Nb+V ≤ |
Heat analyse |
0.08 |
|
|
Product analyse |
0.10 |
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ASTM A738Grade B steel mechanical properties :
|
Grade |
Tensile strength Ksi , [Mpa ] |
Yield strength Ksi , [Mpa ] |
Elongation In 2 in.[50mm],min,% |
|
Grade B |
85-102 [585-705] |
60 [415] |
20 |
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Related link :ASTM A738 Grade A,ASTM A738 Grade C,ASTM A738/A738M
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