ASME SA387 Grade 91 Class 2 Plates: High-Performance Alloy Steel Plates by ASC LLP
ASME SA387 Grade 91 Class 2 Plates are high-strength, alloy steel plates designed for high-temperature and high-pressure service. These plates are primarily used in industries such as power generation, petrochemicals, oil & gas, and thermal processing units. They are engineered to withstand extreme stress and elevated temperatures, making them ideal for fabricating pressure vessels, heat exchangers, boilers, and reactors.
At ASC LLP, we are proud to be trusted Alloy Steel ASME SA387 GR 91 CL. 2 Plates Suppliers, delivering premium-quality plates that meet the strictest international standards.
What is ASME SA 387 GRADE 91 Class 2?
ASME SA387 Grade 91 Class 2 is part of the ASME SA387/ASTM A387 specification for chromium-molybdenum alloy steel plates. These plates are specifically formulated for high-temperature services where resistance to heat and pressure is essential. Grade 91 features a unique combination of chromium (Cr) and molybdenum (Mo), providing excellent corrosion resistance, superior strength, and prolonged life under high-temperature conditions.
Key Features:
- High-temperature and high-pressure resistance
- Excellent creep strength
- Superior oxidation and corrosion resistance
- Exceptional weldability and formability
Enhanced durability in harsh environments
Advantages of Using ASME SA387 Grade 91 Class 2 Plates
- High Strength at Elevated Temperatures: Retains mechanical strength even at 600°C+
- Extended Service Life: Resistant to wear, corrosion, and oxidation – ideal for harsh service conditions.
- Improved Fabrication: Suitable for welding, machining, and forming without loss of mechanical properties.
- Lower Maintenance Costs: Reduced breakdowns and repairs due to enhanced durability.
Related Grades and Alternatives
If your project demands alternatives or compatible grades, we also supply:
- ASTM A387 Grade 11 Class 2
- ASME SA387 Grade 22 Class 2
- ASTM A335 P91 seamless pipes (for piping applications)
- Chrome Moly Plates Grade 9, 5, and 12
Schedule and Size Chart – ASME SA387 Grade 91 Class 2 Plates
| Thickness (mm) | Width (mm) | Length (mm) | Weight (kg/m²) |
| 6 | 1000 – 3000 | Up to 12000 | ~47.1 |
| 8 | 1000 – 3000 | Up to 12000 | ~62.8 |
| 10 | 1000 – 3000 | Up to 12000 | ~78.5 |
| 12 | 1000 – 3000 | Up to 12000 | ~94.2 |
| 16 | 1000 – 3000 | Up to 12000 | ~125.6 |
| 20 | 1000 – 3000 | Up to 12000 | ~157.0 |
| 25 | 1000 – 3000 | Up to 12000 | ~196.25 |
| 30 | 1000 – 3000 | Up to 12000 | ~235.5 |
| 40 | 1000 – 3000 | Up to 12000 | ~314.0 |
| 50 | 1000 – 3000 | Up to 12000 | ~392.5 |
| 60 | 1000 – 3000 | Up to 12000 | ~471.0 |
| 80 | 1000 – 3000 | Up to 12000 | ~628.0 |
| 100 | 1000 – 3000 | Up to 12000 | ~785.0 |
Mechanical Properties of ASTM A387 Gr. 91 Class 2 Plates
| Property | Value |
| Tensile Strength | 585 – 760 MPa |
| Yield Strength | ≥ 415 MPa |
| Elongation | ≥ 18% |
| Impact Resistance | High, even at low temperatures |
| Hardness (Brinell) | 200 – 250 HBW |
Specifications Chart – ASME SA387 Grade 91 Class 2 Alloy Steel Plates
| Standard | ASME SA387 / ASTM A387 |
| Grade | Grade 91 |
| Class | Class 2 (Higher strength than Class 1) |
| Product Form | Rolled Plates |
| Material Type | Chromium-Molybdenum Alloy Steel |
| Heat Treatment | Normalized + Tempered |
| Delivery Condition | As Rolled / Annealed / Quenched & Tempered |
| Surface Finish | Hot Rolled, Shot Blasted, Pickled |
| Application Standard | ASME Boiler & Pressure Vessel Code Section II |
| Certification | EN 10204 3.1 / 3.2, IBR, NACE MR0175 |
Chemical Composition of ASME SA387 Grade 91 Class 2 Plates
| Element | Composition (%) |
| Chromium (Cr) | 8.0 – 9.5% |
| Molybdenum (Mo) | 0.85 – 1.05% |
| Carbon (C) | 0.08 – 0.12% |
| Manganese (Mn) | 0.30 – 0.60% |
| Phosphorus (P) | ≤ 0.020% |
| Sulfur (S) | ≤ 0.010% |
| Silicon (Si) | 0.20 – 0.50% |
| Nitrogen (N) | 0.030 – 0.070% |
| Vanadium (V) | 0.18 – 0.25% |
| Nickel (Ni) | ≤ 0.40% |
Physical Properties Chart – ASME SA387 Grade 91 Class 2 Plates
| Property | Value |
| Density | 7.85 g/cm³ (7850 kg/m³) |
| Melting Point | ~1425 – 1510 °C |
| Thermal Conductivity | ~24.0 W/m·K at 100°C |
| Electrical Resistivity | ~0.45 µΩ·m at 20°C |
| Specific Heat | ~460 J/kg·K |
| Modulus of Elasticity | ~200 GPa (29000 ksi) |
| Hardness (HBW) | 200 – 250 Brinell |
| Magnetic Properties | Magnetic (Ferromagnetic Alloy Steel) |
Applications of ASTM A387 Alloy Steel Gr.91 CL. 2 Plates
ASTM A387 Gr. 91 Class 2 Chrome Moly Plate Suppliers like ASC LLP supply these plates to industries that operate under intense pressure and heat. Some key applications include:
- Thermal Power Plants: Used in boilers and heat exchangers for handling steam at high temperatures.
- Oil and Gas Refineries: Ideal for pressure vessels and processing equipment handling volatile materials.
- Chemical and Petrochemical Industries: Excellent for reactors and containers exposed to corrosive substances.
- Nuclear Plants: Reliable for the fabrication of components that must operate in radiation and heat-intensive environments.
- Industrial Process Equipment: Employed in autoclaves, storage tanks, and other demanding applications.
Why Choose ASC LLP for Alloy Steel ASME SA387 GR 91 CL. 2 Plates?
At ASC LLP, we combine experience, quality, and customer satisfaction to deliver top-notch Alloy Steel ASME SA387 GR 91 CL. 2 Plates that exceed expectations. Here’s what sets us apart:
- Quality Assurance: We provide plates that are tested for mechanical properties, chemical composition, and heat treatment quality. Each batch is inspected thoroughly before dispatch.
- Certifications: Our plates come with all relevant certifications, including EN 10204 3.1/3.2, IBR, and NACE MR0175 standards to assure compliance and safety.
- Global Supply Chain:,We are well-established ASTM A387 Gr. 91 Class 2 Chrome Moly Plate Suppliers with clients across Asia, Europe, the Middle East, and North America.
- Customization & Cutting: We offer value-added services such as plasma cutting, CNC machining, beveling, and plate rolling based on your project needs.
Global Reach
ASC LLP boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality ASME SA387 Grade 91 Class 2 Plates. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
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