SA 387 Grade 22 Class 1 is a type of chromium - molybdenum alloy steel plate formulated under the ASME SA - 387/SA - 387M standard. It is specifically engineered for welded boilers and pressure vessels operating in high - temperature and high - pressure settings, and is widely used in industries like oil and gas, petrochemicals, and power generation.
Equivalents for ASME SA387 Grade 22 Alloy Steel Plates
| BS | EN | ASTM/ASME | DIN |
| 622-515B | 10 CRMO910 | SA387-22-1 | 10 CRMO910 |
Specifications for ASME SA387 Grade 22 Alloy Steel Plates
Chromium & Molybdenum content (according to the ASME specification)
| Designation | Nominal Chromium Content (%) |
Nominal Molybdenum Content (%) |
| SA387 Grade 22 | 2.25% | 1.00% |
Tensile Requirements for ASME SA387 Grade 22 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 22 |
| SA387 Grade 22 | Tensile strength, ksi [MPA] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 45 [310] | |
| Elongation in 8 in. [200mm], min % | ... | |
| Elongation in 2 in. [50mm], min, % | 18 | |
| Reduction of area, min % | 45 (measured on round specimen) 40 (measured on flat specimen) |
Chemical Requirements for ASME SA387 Grade 22 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| SA387 Grade 22 | ||
| Carbon: | Heat Analysis: | 0.05 - 0.15 |
| Product Analysis: | 0.04 - 0.15 | |
| Manganese: | Heat Analysis: | 0.30 - 0.60 |
| Product Analysis: | 0.25 - 0.66 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.50 max |
| Product Analysis: | 0.50 max | |
| Chromium: | Heat Analysis: | 2.00 - 2.50 |
| Product Analysis: | 1.88 - 2.62 | |
| Molybdenum: | Heat Analysis: | 0.90 - 1.10 |
| Product Analysis: | 0.85 - 1.15 |
Key Applications
Oil & GasIt is a premium material for fabricating pressure vessels, heavy-duty piping systems, and critical on-site equipment deployed in refineries and offshore drilling platforms, where it withstands harsh offshore salt spray, fluctuating pressure, and high-temperature fluid transfer conditions.
Power GenerationThe alloy serves as a core material for boilers, shell-and-tube heat exchangers, and high-stress components in thermal, nuclear, and combined-cycle power plants, delivering reliable performance under long-term high-heat and high-pressure operating regimes.
Petrochemical & ChemicalIt is widely adopted for manufacturing reactors, corrosion-resistant storage tanks, and process pipelines in chemical processing plants, effectively resisting erosion from acidic/alkaline media and sustaining stability during continuous chemical reactions.
Gas ProcessingThanks to its excellent corrosion resistance, it is an ideal choice for equipment dedicated to handling sour gas (containing H₂S and CO₂), preventing sulfide stress cracking and ensuring safe and efficient gas purification and treatment.
General FabricationIt is used to produce high-temperature ducting, heavy-duty flanges, and structural components requiring robust heat resistance, meeting the fabrication demands of industrial furnaces, waste heat recovery systems, and other high-temperature working scenarios.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
1.What is the composition of SA 387 Grade 22 Class 1steel?
SA 387 Grade 22 Class 1 is a Cr-Mo alloy steel per the ASME SA-387/SA-387M standard, with a tightly controlled chemical composition: 0.05%–0.15% C, 2.00%–2.50% Cr, 0.90%–1.10% Mo, 0.30%–0.60% Mn, max 0.50% Si, and max 0.035% each for P and S. These elements ensure its high-temperature strength, creep resistance and weldability for pressure vessel applications.
2.What is SA 387 Grade 22 Class 1 material?
SA 387 Grade 22 Class 1 is a chromium-molybdenum (Cr-Mo) alloy steel plate, specified by ASME, designed for pressure vessels and boilers operating at elevated temperatures, offering excellent strength, weldability, and resistance to oxidation and corrosion, with Class 1 indicating specific mechanical properties (like higher ductility/formability) compared to Class 2. Key elements include chromium (around 2.0-2.5%) and molybdenum (around 0.9-1.1%) for high-temp performance, making it ideal for the petrochemical, oil & gas, and power industries.