ASTM A537 Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel
This specification covers heat-treated carbon-manganese-silicon steel plates intended for fusion welded pressure vessels and structures.
Material under this specification is available in the following three classes:
| Class | Heat Treatment | Thickness | Yield Strength, min, | Tensile Strength, min, |
| ksi (MPa) | ksi (MPa) | |||
| 1 | Normalized | ≤2.5in.( ≤65mm) | 50 (345) | 70 (485) |
| >2.5 in.-4in.(>65-100mm) | 45 (310) | 65 (450) | ||
| 2 | Quenched and tempered | ≤2.5in.( ≤65mm) | 60 (415) | 80 (550) |
| >2.5 in.-4in.(>65-100mm) | 55 (380) | 75 (515) | ||
| >4 in.-6in.(>100-150mm) | 46 (315) | 70 (485) | ||
| 3 | Quenched and tempered | ≤2.5in.( ≤65mm) | 55 (380) | 80 (550) |
| >2.5 in.-4in.(>65-100mm) | 50 (345) | 75 (515) | ||
| >4 in.-6in.(>100-150mm) | 40 (275) | 70 (485) |
Chemical Requirements
| Element | Composition，% |
| C，max A | 0.24 |
| Mn | |
| 1½ in. [40 mm] and under in thickness: B | |
| Heat analysis | 0.70-1.35 |
| Product analysis | 0.64-1.46 |
| Over 1½ in. [40 mm] in thickness: | |
| Heat analysis | 1.00-1.60 |
| Product analysis | 0.92-1.72 |
| P, max，A | 0.035 |
| S, max，A | 0.035 |
| Si | |
| Heat analysis | 0.15-0.50 |
| Product analysis | 0.13-0.55 |
| Cu, max | |
| Heat analysis | 0.35 |
| Product analysis | 0.38 |
| Ni, max, B | |
| Heat analysis | 0.25 |
| Product analysis | 0.28 |
| Cr, max | |
| Heat analysis | 0.25 |
| Product analysis | 0.29 |
| Mo, max | |
| Heat analysis | 0.08 |
| Product analysis | 0.09 |
A Applies to both heat and product analyses.
B Manganese may exceed 1.35 % on heat analysis, up to a maximum of 1.60 %, and nickel may exceed 0.25 % on heat analysis, up to a maximum of 0.50 %, provided the heat analysis carbon equivalent does not exceed 0.57 % when based upon the following equation:
CE=C + Mn / 6+ ( Cr + Mo+ V ) / 5 + ( Ni + Cu ) / 15
When this option is exercised, the manganese and nickel contents on product analysis shall not exceed the heat analysis content by more than 0.12 % and 0.03 %, respectively.
Tensile Requirements
| Class 1 ksi(MPa) | Class 2 ksi(MPa) | Class 3 ksi(MPa) | |
| Tensile strength: | |||
| ≤2.5in.( ≤65mm) | 70-90(485-620) | 80-100(550-690) | 80-100(550-690) |
| >2.5in.-4in.(>65-100mm) | 65-85(450-585) | 75-95(515-655) | 75-95(515-655) |
| >4in.-6in.(>100-150mm) | A | 70-90(485-620) | 70-90(485-620) |
| Yield strength, min: | |||
| ≤2.5in.( ≤65mm) | 50(345) | 60(415) | 55(380) |
| >2.5in.-4in.(>65-100mm) | 45(310) | 55(380) | 50(345) |
| >4-6in.(>100-150mm) | A | 46(315) | 40(275) |
| Elongation in 2 in. [50 mm], min, %:B | |||
| ≤4in.( ≤100mm) | 22 | 22 | 22 |
| >4in.(>100mm) | A | 20 | 20 |
| Elongation in 8 in. [200 mm], min, %，B | 18 | C | C |
A Product is not available in this size range.
B See Specification A 20/A 20M for elongation adjustments.
C There is no requirement for elongation in 8 in.
