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| C(%) | V(%) | Si(%) | Mn(%) | P(%) | S(%) | Cr(%) | Mo(%) | Ni(%) | Yield stress (Mpa) | ≦0.25 | ≦0.25 | ≦0.25 | ≦0.25 | ≦0.25 | ≦0.25 | ≦0.25 | ≦0.25 | ≦0.25 | ≦0.25 |
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Quenched and Tempered Alloy Steel Forgings for Pressure Vessels
| Steel Type | Country Code | C(%) | V(%) | Si(%) | Mn(%) | P(%) | S(%) | Cr(%) | Mo(%) | ≦0.03 | ≦0.25 | 0.45-0.60 | SFVQ1B | CNS | ≦0.25 | ≦0.05 | ≦0.4 | 1.2-1.5 | ≦0.03 | ≦0.03 | ≦0.25 | 0.45-0.60 | SFVQ1B | JIS | ≦0.25 | ≦0.05 | ≦0.4 | 1.2-1.5 | ≦0.03 | ≦0.03 | ≦0.25 | 0.45-0.60 | Class 3A | ASTM | ≦0.25 | ≦0.05 | 0.15-0.35 | 1.2-1.5 | ≦0.025 | ≦0.03 | ≦0.25 | 0.45-0.60 |
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| SFVQ1A | Class 3A | SFVQ3 | Class 2A | SFVQ2B | SFVQ2B | SFVQ2A | SFVQ1A | SFVQ1B | Class 3 | SFVQ2A | SFVQ3 | SFVQ1B | SFVQ1B |
| X7CrNiA1-17-7 | SM490B | ECu-57 | A1050TW | SQV1A | - | C91000 | C1720B | C1720W | SCS14A |