SA 387 GR.22 CL.1 PLATES are molybdenum-chromium alloy steel plates furthermore it includes manganese and silicon content. The plates found its application in weldable carbon steel stress vessels at soaring temperatures. The presence of chromium content offers superior corrosion resistance whereas molybdenum content provides excellent tensile strength at elevated temperatures. These grade of plates posses superior durability and ensures excellent stress distribution. Due to the annealing and normalizing process these plates get rock hard surfaces. Whereas the annealing ensures to toughens the surface by reducing the internal stress. The plates are superior malleable plates that offer outstanding formability and rust proof finish.
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 |
Mechanical Properties Of A387 Cr-Mo Grade 22 Class 1 Plates
| A387 / SA387 Grade 22 | Class 1 | Class 2 |
| Tensile Strength (ksi) | 60-85 | 75-100 |
| Tensile Strength (MPa) | 415-585 | 515-690 |
| Yield Strength (ksi) | 30 | 45 |
| Yield Strength (MPa) | 205 | 310 |
| Elongation in 50mm (%) | 18 | 18 |
| Elongation in 50mm (%) | 45 | 45 |
Key Applications
Oil & GasIdeal for fabricating pressure vessels, heavy-duty pipelines, and core processing equipment in refineries and gas treatment plants, withstanding harsh conditions like high temperatures, fluctuating pressures, and sour gas corrosion.
Power GenerationServes as a critical material for boilers, shell-and-tube heat exchangers, and high-stress components in thermal, nuclear, and combined-cycle power plants, ensuring long-term reliability under extreme thermal loads.
PetrochemicalsWidely adopted for manufacturing reactors, pressure vessels, and process piping in chemical plants, resisting erosion from aggressive media during continuous petrochemical production and refining operations.
Chemical ProcessingThe first choice for equipment demanding exceptional high-temperature strength and corrosion resistance, suitable for handling acidic/alkaline substances and high-temperature reaction mixtures in specialty chemical manufacturing.
Shipbuilding & MarineUsed to produce seawater-resistant equipment and key vessel components, withstanding salt spray corrosion and marine environmental stress to maintain structural integrity in offshore and marine engineering projects.
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 SA387 grade 22 material?
SA387 Grade 22 is a chromium-molybdenum (Chrome-Moly) alloy steel plate, specified by ASME/ASTM standards, designed for high-temperature service in boilers and pressure vessels, offering excellent strength, durability, and resistance to oxidation and corrosion, especially in sour gas environments, thanks to its significant chromium (around 2.25%) and molybdenum (around 1%) content.
2.Is SA 387 Grade 22 Class 1 steel plate good quality?
Yes, SA 387 Grade 22 Class 1 steel plate is considered a high-quality material, specifically designed for pressure vessels in high-temperature environments, offering excellent heat resistance, strength, and corrosion resistance due to its chromium-molybdenum alloy composition, making it ideal for oil, gas, and petrochemical applications where elevated temperatures and corrosive fluids are present.