SA387 Grade 22 Class 2 is a chromium-molybdenum (chrome-moly) alloy steel plate used for pressure vessels and boilers in high-temperature service, known for its excellent resistance to corrosion, oxidation, and creep, making it ideal for oil, gas, and chemical processing. The "Grade 22" signifies its 2.25% chromium and 1% molybdenum content, while "Class 2" denotes specific mechanical properties, including higher strength (75-100 ksi tensile strength) and heat treatment (normalized and tempered) for enhanced performance in demanding elevated-temperature applications.
ASME SA387 Gr.22 CL.2 Alloy Steel Plates Equivalent Grades
| COUNTRY | USA | EUROPEAN | GERMANY | ENGLAND | FRANCE | RUSSIA |
| STANDARDS | ASME | EN 10028 | DIN | BS | AFNOR 36206 | GOST |
| Grade 22 | SA387 | 10/11CrMo9-10 | 10CrMo9-10 | 622-515B | 12CD9-10 | 10KH2M |
ASME SA387 Grade 22 CL.2 Alloy Steel Plates Chemical Composition
| Grade | C | Mn | P | S | Si | Cr | Mo |
| SA 387 Gr.22 | 0.05-0.15 | 0.30-0.60 | 0.035 | 0.035 | 0.50 max | 2.00-2.50 | 0.90-1.10 |
ASME SA387 Gr 22 CL.2 Alloy Steel Plates Mechanical Properties
| Class | Tensile (MPa) | Yield (MPa) | Elong. (50mm) | Elong. (200mm) | Reduc'n of Area* |
| Class 1 | 415 - 585 | 205 min | 18% min | - | 40% min |
| Class 2 | 515 - 690 | 310 min | 18% min | - | 40% min |
Key Applications
Pressure Vessels & Boilers
Ideal for industrial boilers and pressure vessels in chemical and petrochemical plants, delivering robust structural stability to withstand long-term high-temperature and high-pressure operating conditions.
Oil & Gas
A top choice for fabricating reactors, storage tanks, and heavy-duty piping, engineered to endure the harsh corrosive and thermal stress of oil and gas extraction, refining, and transportation scenarios.
Power Generation
Widely used in thermal power stations for critical components like steam headers, turbine casings, and heat recovery steam generators (HRSG), ensuring reliable performance under continuous thermal cycling.
Heat Exchangers
Its excellent heat resistance and corrosion resistance make it perfect for heat exchanger construction, optimizing heat transfer efficiency while extending equipment service life.
Sour Gas Environments
Boasts outstanding resistance to sulfide stress cracking, making it suitable for equipment operating in sour gas-containing environments common in oil and gas processing.
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1.What is the price of SA 387 GR 22 plate?
The price of SA 387 Gr 22 plate varies significantly by supplier, quantity, thickness, and specific class (Class 1 or 2), generally ranging from under $1 per pound (or hundreds of dollars per ton) for bulk international orders to several hundred dollars for smaller, specialized coupons, with common pricing around $0.50 to over $1000 per ton or piece depending on specifics.
2.What is the difference between SA387 Grade 22 Class 2 and Class 1 ?
The main difference is mechanical strength: SA387 Grade 22 Class 2 has higher tensile and yield strength than Class 1, meaning it's stronger and resists deformation better, while both classes have the same chemical composition (2.25% Chromium, 1% Molybdenum) but different heat treatments, with Class 2 generally used for higher-temperature, more demanding pressure vessel applications.