ASME SA537/SA537M Class 1 Class 2 Class 3 Pressure Vessel Steel Plate
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Heat-treated carbon-manganese-silicon steel plates for pressure vessels according to ASME SA537/SA537M standards SA537CI1, SA537CI2, SA537CI3
SA537CL2 is a flat steel material made by pouring molten steel and pressing it after cooling.
The product specifications of this steel material are 8~150*1500~3900*2000~18000mm
SA537C11, SA537CI2, SA537CI3 steel plate ordering requirements
1. Vacuum treatment;
2. Additional or special tensile test;
3. Impact test;
4. Nondestructive testing (flaw detection)
SA537C11, SA537CI2, SA537CI3 steel plate steelmaking method steel should be killed steel.
SA537C11, SA537CI2, SA537CI3 steel plate heat treatment All steel plates should be heat treated as follows
Grade 1 steel plates should be normalized.
Grade 2 and 3 steel plates should be quenched and tempered. The tempering temperature of grade 2 steel plates should not be lower than 595℃, and the heat preservation should be more than 0.5h.
The tempering temperature of grade 3 steel plates should not be lower than 620℃, and the heat preservation should be more than 0.5h.
Differences Between ASME SA537/SA537M Class 1, Class 2, and Class 3 pressure vessel steel plate
1. Mechanical Properties
| Class | Yield Strength (min, MPa) | Tensile Strength (MPa) | Elongation (% in 200mm) |
|---|---|---|---|
| Class 1 | ≥ 345 | 485 – 620 | ≥ 18 |
| Class 2 | ≥ 415 | 550 – 690 | ≥ 18 |
| Class 3 | ≥ 450 | 585 – 725 | ≥ 18 |
Notes:
Class 1: Suitable for low-to-medium pressure applications.
Class 2 & 3: Higher strength for demanding pressure or lightweight designs.
2. Thickness Range
| Class | Thickness Range (mm) | Typical Applications |
|---|---|---|
| Class 1 | Up to 200 | Tanks, boilers (ambient/low temps) |
| Class 2 | Up to 200 | Medium-high pressure vessels, reactors |
| Class 3 | Up to 150 | High-pressure/low-temp (e.g., LNG tanks) |
Notes:
Class 3 has stricter thickness limits but superior low-temperature performance.
3. Heat Treatment
| Class | Process | Microstructure |
|---|---|---|
| Class 1 | Normalizing | Ferrite + pearlite |
| Class 2 | Quench & Temper (Q&T) | Tempered bainite/martensite |
| Class 3 | Quench & Temper (Q&T) | Fine-grained, high-toughness |
Notes:
Q&T for Class 2/3 enhances strength and toughness.
4. Low-Temperature Impact Toughness
| Class | Temperature Range | Charpy V-Notch Impact Energy (-45°C) |
|---|---|---|
| Class 1 | ≥ -30°C | Not specified (case-dependent) |
| Class 2 | ≥ -45°C | ≥ 20 J (transverse specimen) |
| Class 3 | ≥ -60°C | ≥ 27 J (transverse specimen) |
Notes:
Class 3 is ideal for cryogenic applications (e.g., LNG storage).
5. Selection Guide
Class 1:
Use for low-cost, general-purpose vessels (ambient to -30°C).
Advantages: Simple heat treatment (normalizing), economical.
Class 2:
Use for medium-high pressure or -45°C environments (e.g., chemical reactors).
Advantages: Balanced strength-toughness ratio.
Class 3:
Use for critical high-pressure or cryogenic systems (e.g., LNG tanks, -60°C).
Advantages: Exceptional low-temp toughness, but higher cost.
6. Key Considerations
Weldability: Class 2/3 require strict welding procedures (preheat, post-weld heat treatment).
Standard Units: Confirm SA537M (metric) or SA537 (imperial) based on project requirements.
Alternatives: For higher performance, consider SA516 Gr.70 or SA533 Type B.
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