ASME SA387 Grade 22 Class 2 (SA387 Gr 22 Cl 2) Steel Plates
ASME SA387 Grade 22 Class 2 (SA387 Gr 22 Cl 2) steel plates are Cr-Mo alloy steel plates with high strength, toughness, and weldability, ideal for boilers and pressure vessels at elevated temperatures.
Specification
ASME SA-387/SA-387M for chromium-molybdenum alloy steel plates in pressure vessels
Dimensions
6-100mm thick, 4600mm max wide, 12000mm max long
Hardness/Density
ASME SA387 Gr 22 Cl 1 Hardness 140-200 HB, Density 7.85 g/cm³
Equivalent Material
12CrMo5-10 (EN10028-2), STBA28 (JIS G4109), 12Cr2Mo1WVTiB (GB/T 713)
What is ASME SA387 Grade 22 Class 2？
ASME SA387 Grade 22 Class 2 (SA387 Gr 22 Cl 2) steel plates belong to the chrome-moly (Cr-Mo) alloy steel family, widely used in high-temperature pressure vessels, boilers, and heat exchangers.
With 2.25% chromium and 1% molybdenum, Grade 22 offers excellent high-temperature strength, creep resistance, and oxidation resistance. Compared with Class 1, Class 2 provides higher tensile and yield strength, making it suitable for more demanding applications at elevated service temperatures.
These plates are supplied in normalized and tempered (N+T) or quenched and tempered (Q+T) condition, ensuring a reliable combination of strength, toughness, and weldability.
Material Specification
| Specification Element | Requirement | SHH STEEL Supply |
| Standard | ASME SA387 / ASTM A387 | Pressure vessel quality alloy steel |
| Grade | 22 | 2.25Cr-1Mo alloy |
| Class | 2 | Higher strength than Class 1 |
| Thickness Range | 6 – 150 mm | Custom up to 200 mm |
| Width/Length | Up to 4200 mm / 18000 mm | Large-format plates |
| Heat Treatment | Normalized + Tempered / Q+T | Furnace controlled |
| Inspection | UT, Charpy, 3rd-party | SGS / BV / TUV available |
Chemical Composition
| Element | Heat Analysis (%) | Product Analysis (%) | Remarks |
| Carbon (C) | 0.08 – 0.15 | 0.07 – 0.16 | Balances strength and weldability |
| Manganese (Mn) | 0.30 – 0.60 | 0.28 – 0.65 | Enhances toughness |
| Phosphorus (P) | ≤ 0.025 | ≤ 0.030 | Controlled for toughness |
| Sulfur (S) | ≤ 0.010 | ≤ 0.015 | Low sulfur for improved weldability |
| Silicon (Si) | 0.50 – 1.00 | 0.45 – 1.05 | Strengthens, improves oxidation resistance |
| Chromium (Cr) | 1.90 – 2.60 | 1.85 – 2.65 | Provides high-temperature oxidation resistance |
| Molybdenum (Mo) | 0.87 – 1.13 | 0.85 – 1.15 | Improves creep resistance at high temperatures |
| Nickel (Ni) | ≤ 0.25 | ≤ 0.30 | Residual, controlled |
| Copper (Cu) | ≤ 0.25 | ≤ 0.30 | Residual, controlled |
Mechanical Properties
| Property | Requirement | Test Method |
| Tensile Strength | 515 – 690 MPa | ASTM A370 |
| Yield Strength | ≥ 310 MPa | ASTM A370 |
| Elongation (200 mm) | ≥ 18% | ASTM A370 |
| Charpy V-Notch Impact | ≥ 27J @ -20°C | ASTM A370 |
| Hardness | 190 – 240 HB | ASTM E18 |
Heat Treatment
- Normalized at ~930–980°C
- Tempered at 650–700°C
- Optionally quenched and tempered (Q+T)
Delivery
- Supplied in N+T or Q+T with EN 10204 3.1/3.2 certificates
Tolerances
- Thickness: ±1.5mm (≤40mm), ±2.0mm (>40mm)
- Width/Length: ±10mm standard
- Flatness: ≤3mm/m
Weldability
- Good weldability due to controlled carbon
- Preheat may be required for thick plates (>50mm)
- PWHT recommended for high-pressure service
Equivalent Grades
| Standard | Grade | Notes |
| ASTM A387 | Grade 22 Class 2 | Equivalent |
| EN 10028-2 | 13CrMo4-5 | European equivalent |
| DIN 17155 | 10CrMo9-10 | German equivalent |
| JIS G3103 | SBV2 | Japanese equivalent |
| GB/T 21342 | 12Cr2Mo1R | Chinese equivalent |
Supplementary Requirements
- Ultrasonic testing (ASTM A435 / A578)
- Impact testing at sub-zero temperature
- Third-party inspection (SGS, TUV, BV)
- Surface protection: shot blasting, primer coating
Applications
| Application | Service Temp | Industry |
| Boilers | Up to 600°C | Power generation |
| Pressure Vessels | 400–600°C | Petrochemical |
| Heat Exchangers | High temp | Refinery & LNG |
| Storage Tanks | Elevated | Oil & gas |
| Nuclear & Offshore | Harsh service | Energy sector |
Why Choose SHH STEEL
- 15+ years of experience in chrome moly alloy steel supply
- Large inventory of SA387 Grade 22 Class 2 plates
- Fast global delivery with competitive prices
- Mill test certificates (EN 10204 3.1/3.2)
- Custom cutting, beveling, machining available
FAQ
- What is ASME SA387 Grade 22 Class 2 used for?It is used in boilers, pressure vessels, and heat exchangers operating at high temperature and pressure.
- What is the difference between Class 1 and Class 2?Class 2 has higher tensile and yield strength than Class 1, making it more suitable for demanding high-temperature applications.
- What is the chemical composition of SA387 Gr 22 Cl 2?It contains 2.25% chromium and 1% molybdenum, with controlled carbon, Mn, Si, and low residuals.
- What are the mechanical properties?Tensile strength 515–690 MPa, yield ≥310 MPa, elongation ≥18%, impact ≥27J at -20°C.
- Is SA387 Grade 22 Cl 2 weldable?Yes, it has good weldability, but preheating and post-weld heat treatment are often required for thick sections.
- What thicknesses are available?Standard thickness is 6–150mm, with customized supply up to 200mm.
- What are the equivalent international grades?EN 13CrMo4-5, DIN 10CrMo9-10, JIS SBV2, GB 12Cr2Mo1R.
- What heat treatment condition is supplied?Plates are supplied in normalized + tempered or quenched + tempered condition.
- What industries commonly use SA387 Gr 22 Cl 2?Power generation, refinery, petrochemical, nuclear, and offshore energy.
- Does SHH STEEL provide third-party inspection?Yes, we work with SGS, BV, and TUV to meet client requirements.
Conclusion
ASME SA387 Grade 22 Class 2 (SA387 Gr 22 Cl 2) steel plates are high-quality Cr-Mo alloy steel plates with excellent strength, toughness, creep resistance, and weldability, widely applied in boilers, pressure vessels, and petrochemical equipment.
With global stock availability, mill-certified quality, and reliable delivery, SHH STEEL is your trusted supplier of SA387 Gr 22 Cl 2 plates for critical high-temperature service projects.
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