ASTM A738Grade A is a kind of C-Mn-Si steel plates material used to fabric middle or low temperature pressure vessels. Obviously, A738is divided into three grades or levels :A738Gr. A, A738Gr. B, A738Gr. C . In order to meet the property requirement of ASTM SA-738/SA-738M standard, this material must be done heat-treatment.
ASTM A738Grade A steel equivalent material :
|
CN |
JP |
USA |
GM |
|
|
GB |
JIS |
ASTM |
DIN |
|
|
713 |
G3115 |
17155 |
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|
Materal No |
Mark |
|||
|
16Mng |
SPV315 |
A414 Gr.G/A455 |
1.0482 |
19Mn5 |
ASTM A738Grade A steel chemical composition (%) :
|
Compostion |
A738 Grade A |
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C ≤ ① |
0.24 |
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|
Mn |
Heat analyse |
Thickness ≤65mm |
≤1.50 |
|
Thickness＞65mm |
≤1.60 |
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|
Product analyse |
Thickness ≤65mm |
≤1.62 |
|
|
Thickness＞65mm |
≤1.72 |
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P ≤ ① S ≤ ① |
0.035 |
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Si |
Heat analyse |
0.15~0.50 |
|
|
Product analyse |
0.13~0.55 |
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Cu ≤ |
Heat analyse |
0.35 |
|
|
Product analyse |
0.38 |
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Ni ≤ |
Heat analyse |
0.50 |
|
|
Product analyse |
0.53 |
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Cr ≤ |
Heat analyse |
0.25 |
|
|
Product analyse |
0.29 |
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Mo ≤ |
Heat analyse |
Thickness ≤65mm |
0.08 |
|
Thickness＞65mm |
0.08 |
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|
Product analyse |
Thickness ≤65mm |
0.09 |
|
|
Thickness＞65mm |
0.09 |
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V ≤ |
Heat analyse |
0.07 ② |
|
|
Product analyse |
0.08 ② |
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Nb ≤ |
Heat analyse |
0.04 ② |
|
|
Product analyse |
0.05 ② |
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Nb+V ≤ |
Heat analyse |
0.08 ② |
|
|
Product analyse |
0.10 ② |
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① means be suitable for both heat analyse and product analyse
② After agreement,can add V and Nb
③ For Grade C, Nb is not the required composition.
ASTM A738 Grade A steel mechanical properties :
|
Grade |
Tensile strength Ksi , [Mpa ] |
Yield strength Ksi , [Mpa ] |
Elongation In 2 in.[50mm],min,% |
|
Grade A |
75-95 [515-655] |
45 [310] |
20 |
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Related link :ASTM A738 Grade B,ASTM A738 Grade C,ASTM A738/A738M
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