ASME SA387 Grade 22 Class 2 (equivalent to ASTM A387 Grade 22 Class 2) is a 2.25Cr‑1Mo chromium‑molybdenum alloy steel plate dedicated for pressure vessel service, commonly referred to as 2.25Cr‑Mo plate within the industry. The standard specifies a minimum tempering temperature of 1250 °F. This grade is engineered for high‑temperature, high‑pressure sour‑service conditions involving hydrogen sulfide in oil and gas applications.
Founded in 2008, GNEE Steel has specialized in exporting pressure‑vessel alloy steel plates for 18 years. Covering a plant area of 30 000 m², we are equipped with in‑house professional heat‑treatment and ultrasonic testing production lines. Our product portfolio covers the full range of ASME, EN and DIN pressure‑bearing steel plates. Our business reaches more than 200 countries worldwide, with stable supply records for Middle‑East refineries, Southeast‑Asia power plants and chemical‑equipment projects across Europe and the Americas.
GNEE Steel maintains a ready stock of 3,000 tonnes of SA387 Grade 22 Class 2; cutting and shipment can be arranged on the same day for specifications ranging from 6mm to 150mm.
ASME SA387 Grade 22 Class 2 Global Equivalent Grades
| Standard System | Equivalent Grade |
|---|---|
| EN 10028‑2 | 10CrMo910 |
| DIN / W.Nr. | 10CrMo910 |
| BS 1501 | 622‑515B |
| Chinese GB (approximate) | 12Cr2Mo1R |
| Matching Forging Grade (ASTM) | A182 F22 |
ASME SA387 Grade 22 Class 2 Pressure Vessel Alloy Steel Plate Specification
| Item | Details |
|---|---|
| Full Product Name | ASME SA387 Grade 22 Class 2 Pressure Vessel Alloy Steel Plate |
| Applicable Standard | ASME SA387 / ASTM A387 |
| Nominal Alloy Composition | 2.25%Cr + 1.0%Mo |
| Thickness Range | Stock: 8‑150 mm; Customized: 4.7 mm (3/16")‑300 mm |
| Width Range | 1600‑4500 mm |
| Length Range | 3000‑18000 mm |
| Delivery Condition | Normalized & Tempered (N&T, main) |
ASME SA387 Grade 22 Class 2 Alloy Steel Plate Mechanical Property
| Property | ASME SA387 Grade 22 Class 2 |
|---|---|
| Tensile Strength, MPa | 515‑690 |
| Min Yield Strength (0.2 % offset), MPa | 310 |
| Min Elongation (50 mm gauge length) | 18 % |
| Reduction of Area (round specimen), min | 45 % |
| Reduction of Area (flat specimen), min | 40 % |
ASME SA387 Grade 22 Class 2 Alloy Steel Plate Chemical Composition
| Element | Heat Analysis | Product Analysis |
|---|---|---|
| C | 0.05‑0.15 | 0.04‑0.15 |
| Mn | 0.30‑0.60 | 0.25‑0.66 |
| Si | ≤0.50 | ≤0.50 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.025 | ≤0.025 |
| Cr | 2.00‑2.50 | 1.88‑2.62 |
| Mo | 0.90‑1.10 | 0.85‑1.15 |
High‑Temperature Service Performance of ASME SA387 Grade 22 Class 2 PVQ Plate
Continuous safe operating temperature: up to 550 °C; short‑term peak temperature tolerance of 600 °C. Measured stress‑rupture strength ≥92 MPa at 560 °C (data from third‑party high‑temperature tensile test reports).
High‑temperature oxidation resistance: oxidation weight gain only 0.32 mg/cm² after 1000 hours continuous exposure at 550 °C, far lower than ordinary carbon steel.
Sour‑service compatibility: hardness controlled at ≤22 HRC (≈217 HB), satisfying NACE MR0175 requirements for H₂S‑containing sour media; HIC (Hydrogen‑Induced Cracking) test is available.
HTHA (High‑Temperature Hydrogen Attack) resistance: conforms to API 941 Nelson‑curve criteria, eliminating risk of laminar cracking for hydrogen‑exposed hydrogenation reactors in long‑term service.
Tempering stability: minimum tempering temperature 1250 °F. Compared with Gr.11 (1150 °F), it achieves a 42 % reduction in embrittlement susceptibility during prolonged high‑temperature operation.
Welding Properties of ASME SA387 Grade 22 Class 2 Pressure Vessels Plate
1. Preheat requirement: 150 °C for plate thickness ≤25 mm; 200‑250 °C for thickness ＞25 mm. Interpass temperature shall not exceed 250 °C.
2. Matching consumables:
- SMAW (Shielded Metal‑Arc Welding): AWS E8018‑B2
- SAW (Submerged‑Arc Welding): EB3/FB3
- GTAW: ER90S‑B3
3. Mandatory Post‑Weld Heat Treatment (PWHT): hold at 680‑710 °C; 1‑hour holding time per 25 mm of plate thickness, minimum holding time of 2 hours, to relieve welding residual stress and reduce hardness.
4. Thermal cutting (plasma / flame cutting) shall be performed with minimum 150 °C preheat to avoid cold cracking at cut edges.
ASME SA387 Grade 22 Class 2 Steel Plate Typical Application Scenarios
1. Oil & Petrochemical Industry
Hydrogenation reactors, reformer units, sour‑gas storage tanks, coking towers, high‑pressure heat exchangers, high‑temperature oil‑and‑gas process piping, flanges and pipe clamps; suitable for H₂S‑containing sour crude and refinery operating environments.
2. Thermal Power Generation
Power‑station boiler drums, waste‑heat recovery heat exchangers, high‑temperature headers, turbine pressure‑bearing casings, high‑temperature boiler ducts.
3. Fine‑Chemical Manufacturing
High‑temperature high‑pressure reactors, synthesis units, heat‑exchange equipment, high‑pressure surge vessels.
4. New‑Energy & Auxiliary Facilities
Biomass‑fired boilers, high‑temperature pressure‑bearing components for concentrated solar‑power thermal‑energy storage, auxiliary pressure‑bearing parts for small‑scale nuclear‑power facilities.
Why Choose GNEE Steel?
- Third‑party test coordination: HIC test, low‑temperature Charpy impact test, API 934 compliance, witnessed inspection by SGS / TÜV.
- One‑stop document service: EN 10204 3.2 MTC, certificate of origin, commodity inspection and complete set of export customs‑clearance documents.
- Fast delivery from stock: standard thickness range 8‑150 mm, shipment within 3‑7 days; custom heavy‑gauge plates with lead‑time 15‑25 days.
- Export‑oriented solutions: salt‑spray resistant export packaging, consolidation / full‑container sea‑freight arrangement, support for overseas multi‑warehouse stocking programmes.
To receive a formal export quotation-including delivery lead times, packaging details, and a full set of documentation-please provide the following information: plate thickness and dimensions (length/width), purchase tonnage, operating conditions (temperature and H₂S content), additional testing requirements, and destination country standards. We will issue the quotation within 24 hours.
FAQ
How do you choose between SA387 Grade 22 Class 2 and Grade 22 Class 1?
Choosing between ASME SA387 Grade 22 Class 1 and Class 2 depends on your required design strength and operating pressure. Both share an identical chemical composition of 2.25% chromium and 1.00% molybdenum, but Class 2 provides higher yield and tensile strength through specific heat treatment.
What are the key differences between SA387 Grade 22 and Grade 11?
The principal differences between ASME SA387 Grade 22 and Grade 11 are their chemical composition and high-temperature capability. Grade 22 features a nominal 2.25% Cr - 1% Mo alloy design for more intense, higher-temperature environments, whereas Grade 11 uses a lower 1.25% Cr - 0.5% Mo system suited for moderate thermal conditions.
Can SA387 Grade 22 Class 2 fully replace EN 10CrMo910?
Yes, ASME SA387 Grade 22 Class 2 is widely considered a direct technical equivalent and can generally replace EN 10CrMo9-10 (1.7380) for high-temperature pressure vessel applications, as both share a nominal chemical composition of 2.25% Chromium and 1.0% Molybdenum. However, direct administrative substitution requires verification because they belong to different governing code standards.
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