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Member Since 2 Years
Nature of Business Supplier
GST No. 27AQCPC2714K1Z4Ask for more detail from the seller
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Product Overview
ASME SA 387 Grade 91 Class 1 / Class 2 Plates are advanced 9Cr-1Mo-V (chromium-molybdenum-vanadium) alloy steel plates, engineered for elevated temperature and high-pressure applications. These plates are widely used in thermal power plants, nuclear plants, heat recovery steam generators, pressure vessels, and boilers.
Grade 91 is known for its exceptional creep strength, thermal stability, and oxidation resistance, even at temperatures exceeding 600°C. Class 2 offers higher mechanical strength than Class 1, suitable for highly demanding service conditions.
Key FeaturesExceptional creep and stress rupture resistance
Outstanding oxidation and corrosion resistance at high temperatures
High mechanical strength and thermal stability
Improved microstructure with tempered martensitic properties
Supplied in normalized, tempered, and tempered-martensitic condition
| Grade | Grade 91 |
| Class | Class 1 and Class 2 |
| Delivery Condition | Normalized and Tempered (Tempered Martensitic) |
| Thickness | 6 mm – 100 mm |
| Width | Up to 3000 mm |
| Length | Up to 12000 mm |
| Surface Finish | Mill Finish / Shot Blasted / Painted |
| Tensile Strength | 585 – 760 MPa | 620 – 795 MPa |
| Yield Strength | ≥ 415 MPa | ≥ 450 MPa |
| Elongation | ≥ 18% | ≥ 18% |
| Impact Toughness | As per ASME Requirement | As per ASME Requirement |
| 0.08–0.12 | 0.30–0.60 | 0.20–0.50 | ≤0.02 | ≤0.01 | 8.0–9.5 | 0.85–1.05 | 0.18–0.25 | 0.06–0.10 | 0.030–0.070 |
Ultrasonic Testing – ASTM A578 / EN 10160
Charpy Impact Testing – at -20°C or lower on request
Hardness Testing – Controlled for creep service
Creep Rupture & Tensile Testing
Third-party Inspection – TUV, Lloyd 's, DNV, SGS (if required)
Supercritical and ultra-supercritical boiler components
High-pressure steam piping systems
Heat recovery steam generators (HRSG)
Power plant pressure vessels and headers
Thermal and nuclear power projects
Mill Test Certificate – EN 10204 3.1 / 3.2
Chemical and Mechanical Testing Reports
Impact, Hardness & UT Test Reports
Creep data and microstructure evaluation (on request)
Third-party inspection documentation (if required)
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Girgaon, Mumbai, Maharashtra 
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