Piyush Steel is known as a reliable supplier and manufacturer of quality alloy steel products to different industries throughout the world. We produce a comprehensive selection of pressure-grade plates such as ASTM A387 Grade 91 Alloy Steel Plates which is necessary for applications requiring extremely high-pressure and temperature conditions. Each type of steel plate manufactured by us meets strict quality requirements and has been engineered to provide extended service life in tough environments.
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ASTM A387 Grade 91 alloy steel plates, typically found in both; heat exchanger and boiler applications, maintain their original shape and stability under continuous exposure to high-heat and pressure conditions over many hours. ASTM A387 Grade 91 alloy steel plates, which were designed to be used within power plants, petrochemical plants and various heavy-duty equipment, feature a high corrosion-resistance rating due to its base material being made of chromium and molybdenum. This combination gives ASTM A387 Grade 91 alloy steel plates excellent resistance to creep as well as a long service life.
The A387 Gr 91 Steel Plate is a pressure vessel quality steel plate. The ASTM A387 specification covers chromium-molybdenum alloy steel plates for use in welded boilers and pressure vessels. These materials operate at elevated temperatures. The 'Grade 91' designation indicates a precise chemical composition.
The essential base elements are chromium (Cr) and molybdenum (Mo).Chromium provides strong corrosion and oxidation resistance. Molybdenum enhances the material's strength and creep resistance at high temperatures. The steel contains Vanadium (V) and Niobium (Nb) which helps stabilize the microstructure. This grade of steel is stable and has exceptional strength when compared to typical alloy steels. Grade 91 will not lose significant strength due to temperature increases, as other alloy steels; however, this steel is designed to maintain strength and structural integrity under extremely high heat. Grade 91 is an suitable for long-term and high-temperature applications and for critical uses.
The Grade 91 Alloy Steel Sheets we supply offer significant advantages for demanding applications.
The first step in your project is to choose the right specification.We ensure that all of our materials meet both national and international standards.
This makes sure that it works and is compatible with your current systems.Our commitment to these standards confirms you receive a consistent, quality-tested product. When you buy our A387 Gr 91 Steel Plate, you are buying compliance and guaranteed performance.
Specifications: ASTM A387 / ASME SA387
Thickness: 1mm-300mm
Width: 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, 4050mm etc
Length: 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, 12000mm, 15000mm etc
Surface: 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, checkered, embossed, hair line, sand blast, Brush, etching, etc
Finish: Hot rolled plate (HR)
Form: Coils, Foils, Rolls, Plain Sheet, Chequered Plates, Shim Sheet, Strip etc.
The mechanical properties of A387 Grade 91 Plates are what make them perfect for pressure vessel applications. These plates are required to be tough, strong, and resistant to permanent changes under stress.
These numbers prove the steel’s ability to withstand significant force and heat without breaking. They are a clear sign of the material's superior engineering for demanding roles.
| Property | Value |
| Tensile Strength (MPa) min | 415 |
| Yield Strength 0.2% Proof (MPa) min | 585 |
| Elongation (50mm) min | 20% |
Grade 91 operates differently than other grades because of its unique chemical composition. We keep a close eye on each chemical component which lets us create unique properties like high temperature strength and creep resistance.
The controlled composition ensures that each plate and sheet will perform the same way when put through extreme conditions. This makes us sure that the material will hold up under heavy loads and stresses during important parts and installations.
| Grade | C | Mn | Si | P | S | Cr | Mo |
| Alloy Steel Gr 91 | 0.08 – 0.12 | 0.30 – 0.60 | 0.20 – 0.50 | 0.020 | 0.012 | 8.00 – 9.50 | 0.18 – 0.25 |
| BS | EN | ASTM/ASME | UNS | DIN |
| - | - | A387 / SA 387 | K90901 | 10CrMoVNb9-1 |
When you need reliable, high-specification material, you need a reliable partner. We are a well known ASTM A387 Grade 91 Alloy Steel Plates Supplier for major projects globally. We combine our expertise with a commitment to customer satisfaction. We maintain a large, ready stock availability of all common sizes and thicknesses. This means you get the material you need, fast. Every order we process comes with full Mill Test Certificates (MTC). This allows you to have the entire process traced back to the source and gives you the evidence of quality. Our global export experience is vast. We take care of all the logistics to get your order to any place in the world.
We provide custom thickness and length options. This means that complex designs can be accommodated perfectly. Our quality control methods that are very strict have been set up to be in line with the international standards at every phase. We give priority to quick dispatch and safe, export-grade packaging. This ensures that the A387 Grade 91 Plates Price you pay is the same as the perfect condition of the product upon arrival.
Quality is not just a claim; it is a proven process at Piyush Steel.Every batch of material undergoes rigorous testing to confirm its integrity and performance. We use PMI testing (Positive Material Identification) to verify the precise chemical composition of the alloy. This confirms the presence of all essential Grade 91 elements like chromium and molybdenum. We perform a Hardness Test to measure the material's resistance to permanent deformation. The Tensile Test is crucial for determining the steel's yield strength, ultimate tensile strength, and elongation. As an ISO-certified company, our quality management systems meet international standards consistently.Finally, we use Ultrasonic Testing (UT). This non-destructive test checks for internal flaws, cracks, or voids within the plate, ensuring a structurally sound product before it ever leaves our facility.
We understand that safe delivery is as important as product quality. We take extreme care in preparing your order for shipment. All our plates and sheets are secured on strong, heat-treated wooden pallets. We use waterproof wrapping and durable plastic sheets to protect the material from moisture and dust during transit.Edges are protected with plastic caps or steel banding to prevent damage from handling. We use robust, export-grade packaging that is suitable for sea freight and long-distance transport. We arrange worldwide delivery. Our goal is to provide reliable timelines. We ensure the material reaches your site on time for project success.

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With Mill And Third Party Test Certificate.
ASTM A387 Grade 91 Alloy Steel Sheets Plates Price List
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