Tubewell Steel & Engg. Co. is a leading manufacturer and stockist specializing in Alloy Steel Pipes, Tubes, Fittings and Flanges for critical industrial applications.
2.25% Chromium – 1% Molybdenum pressure vessel plates in Class 1 and Class 2 for hydroprocessing reactors, boilers and hydrogen service.
Tubewell Steel & Engg. Co. is a stockist and supplier of ASTM A387 Gr 22 plates in Mumbai, India. Grade 22 is a 2¼Cr-1Mo pressure vessel steel with higher creep strength than Grade 11 and excellent resistance to high-temperature hydrogen attack. It is the preferred plate for hydrocracker and hydrotreater reactors.
Why A387 Grade 22 is trusted for reactors and hydrogen service
ASTM A387 Grade 22 is a chromium-molybdenum alloy steel plate containing nominally 2.25% chromium and 1% molybdenum. The higher alloy content gives better creep and rupture strength than Grades 11 and 12, together with good resistance to oxidation, sulphidation and high-temperature hydrogen attack. The grade is widely used in welded pressure vessels operating up to about 600°C (1110°F), depending on the design code.
Grade 22 is available as Class 1 (205 MPa minimum yield) and the higher-strength Class 2 (310 MPa minimum yield). Plates are supplied annealed, or normalized and tempered, with a minimum tempering temperature of 675°C (1250°F). For heavy-wall reactor service we can supply plates with simulated PWHT, impact testing and step-cooling requirements as specified. Every plate is supplied with an EN 10204 3.1 mill test certificate, and third-party inspection can be arranged on request.
Standard supply range for ASTM A387 Gr 22 plates
| Parameter | Details |
|---|---|
| Standard | ASTM A387, ASME SA387 |
| General Requirements | ASTM A20 / ASME SA20 |
| Grade | Grade 22 (UNS K21590) |
| Class | Class 1, Class 2 |
| Thickness | 3 mm to 150 mm (higher thickness on request) |
| Width | Up to 2500 mm (3000 mm on request) |
| Length | Up to 12000 mm |
| Forms | Sheet, Plate, Coil, Strip, Circle, Ring, Flat |
| Finish | Hot Rolled (HR), Cold Rolled (CR), Shot Blasted |
| Delivery Condition | Annealed, Normalized & Tempered (tempering min. 675°C) |
| Cutting Services | Plasma, Gas / Oxy-fuel, Waterjet, Shearing, Profile Cutting to Drawing |
| Testing | Tensile, Hardness, Impact, UT (ASTM A435 / A578), PMI, Simulated PWHT |
| Certificates | EN 10204 3.1 / 3.2, IBR (where applicable), TPI Reports |
International equivalents of A387 Grade 22
| Grade | ASTM / ASME | UNS | EN 10028-2 | W.Nr. | JIS G4109 | Nominal Composition |
|---|---|---|---|---|---|---|
| Gr 22 | A387 / SA387 Gr 22 | K21590 | 10CrMo9-10 | 1.7380 | SCMV 4 | 2.25Cr-1Mo |
Equivalents are the closest comparable grades; chemistry and mechanical limits are not identical. Please confirm suitability against your design code.
Weight %, heat analysis as per ASTM A387
| Grade | C | Mn | P | S | Si | Cr | Mo |
|---|---|---|---|---|---|---|---|
| A387 Gr 22 | 0.05 – 0.15 | 0.30 – 0.60 | 0.025 max | 0.025 max | 0.50 max | 2.00 – 2.50 | 0.90 – 1.10 |
Tensile requirements at room temperature as per ASTM A387
| Grade | Tensile Strength | Yield Strength (min) | Elongation in 50 mm (min) |
|---|---|---|---|
| Gr 22 Class 1 | 415 – 585 MPa (60 – 85 ksi) | 205 MPa (30 ksi) | 18% |
| Gr 22 Class 2 | 515 – 690 MPa (75 – 100 ksi) | 310 MPa (45 ksi) | 18% |
Typical values (for reference)
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Range | 1450 – 1510 °C | 2640 – 2750 °F |
| Modulus of Elasticity | 205 GPa | 29.7 × 10³ ksi |
| Thermal Conductivity (100°C) | 36 W/m·K | 20.8 BTU/h·ft·°F |
| Mean Thermal Expansion (20–300°C) | 12.5 µm/m·°C | 6.9 µin/in·°F |
| Specific Heat | 0.46 J/g·°C | 0.11 BTU/lb·°F |
| Max. Service Temperature | ≈ 600 °C | ≈ 1110 °F |
Plate thickness (mm) vs theoretical weight (kg/m²)
| Thickness (mm) | ≈ Inch | Weight (kg/m²) | 1500 × 6000 mm (kg) | 2000 × 6000 mm (kg) | 2500 × 12000 mm (kg) |
|---|---|---|---|---|---|
| 3 | 1/8" | 23.55 | 211.95 | 282.60 | 706.50 |
| 5 | 3/16" | 39.25 | 353.25 | 471.00 | 1177.50 |
| 6 | 1/4" | 47.10 | 423.90 | 565.20 | 1413.00 |
| 8 | 5/16" | 62.80 | 565.20 | 753.60 | 1884.00 |
| 10 | 3/8" | 78.50 | 706.50 | 942.00 | 2355.00 |
| 12 | 1/2" | 94.20 | 847.80 | 1130.40 | 2826.00 |
| 16 | 5/8" | 125.60 | 1130.40 | 1507.20 | 3768.00 |
| 20 | 3/4" | 157.00 | 1413.00 | 1884.00 | 4710.00 |
| 25 | 1" | 196.25 | 1766.25 | 2355.00 | 5887.50 |
| 30 | 1 3/16" | 235.50 | 2119.50 | 2826.00 | 7065.00 |
| 40 | 1 9/16" | 314.00 | 2826.00 | 3768.00 | 9420.00 |
| 50 | 2" | 392.50 | 3532.50 | 4710.00 | 11775.00 |
| 60 | 2 3/8" | 471.00 | 4239.00 | 5652.00 | 14130.00 |
| 80 | 3 1/8" | 628.00 | 5652.00 | 7536.00 | 18840.00 |
| 100 | 4" | 785.00 | 7065.00 | 9420.00 | 23550.00 |
| 150 | 6" | 1177.50 | 10597.50 | 14130.00 | 35325.00 |
Weight (kg/m²) = Thickness (mm) × 7.85. Values are theoretical; actual weights vary within ASTM A20 thickness tolerances. Standard plate sizes: 1250 × 2500, 1500 × 3000, 1500 × 6000, 2000 × 6000, 2500 × 6000 and 2500 × 12000 mm. Cut-to-size pieces supplied on request.
Where ASTM A387 Gr 22 plates are used
Hydrocracker and hydrotreater reactor shells and heads.
High-temperature, high-pressure vessels in hydrogen service.
Boiler drums, headers and steam generator components.
Feed-effluent exchanger shells, channels and tube sheets.
Separators, coke drums and high-temperature process equipment.
HRSG components, steam separators and high-temperature ducting.
Quality you can verify on every heat
Large inventory for fast dispatch
MTC EN 10204 3.1 / 3.2
Positive material identification
Pan-India & export shipping
Quick answers about A387 Grade 22 plates
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