Yousef Steel is a reliable producer and supplier of Alloy Steel Grade 91 coil in Riyadh, Saudi Arabia, providing high-performance steel products to various industries including power generation, oil and gas, petrochemicals, and pressure vessel manufacturing. Produced according to specifications such as ASTM A387 and ASME SA387, Grade 91 coils are renowned for their high strength, heat resistance, and longevity of performance under extreme conditions. Yousef Steel maintains uniform quality, accurate dimensions, and on-time delivery, offering Grade 91 alloy coils with the stringent demands of high-temperature as well as high-pressure applications.
Alloy Steel Grade 91 coil is a ferritic-martensitic steel with the presence of chromium (8.00–9.50%), molybdenum (0.85–1.05%), vanadium (0.18–0.25%), niobium (0.06–0.10%), carbon (0.08–0.12%), and manganese (0.30–0.60%). This composition provides high tensile strength (at least 585 MPa), yield strength (at least 415 MPa), and good creep resistance. Grade 91 shows good oxidation resistance and thermal stability, especially in long-term high-temperature service conditions. The material is generally supplied in normalized and tempered condition for optimum mechanical performance and weldability.
| Specifications | ASTM A387 / ASME SA387 |
| Standard | ASTM, ASME and API |
| Thickness | 4.0mm – 100mm |
| Specialize | Shim Sheet, Perforated Sheet, B. Q. Profile. |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) |
| Finish | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated) |
| Hardness | Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc. |
| Grade | ASTM A387 GR.91 |
| Grade | C | Ni | Mn | S | V | Al | Si | Nb | Cr | Mo | Nitrogen | P |
| A387 GR.91Â | 0.06-0.15 max | 0.43 max | 0.25-0.66 max | 0.012 max | 0.16-0.27 max | 0.05 max | 0.18-0.56 max | 0.05-0.11 max | 7.90-9.60 max | 0.80-2.10 max | 0.025-0.080 max | 0.025 max |
| Grade | A387 GR.91 CL.2 | |||
| A387 GR.91Â | Thickness mm | Yield Min Mpa | Tensile Mpa | Elongation Min % |
| t≦50 | 415 | 585-760 | 18 | |
| 50<t≦200 | – | – | – | |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Yousef Steel based in Riyadh, Saudi Arabia is a trusted manufacturer and supplier for Alloy Steel Grade 91 Coils of great quality. In fact, we have earned our reputation for providing a variety of top-notch steel products-such as Structural Steel, Alloy Steel, Carbon Steel, Mild Steel, and Galvanized Steel-with emphasis on Structural Steel Sheets and Plates. Basic product lines include a complete range of Pipes, Tubes, Flanges, Forged Fittings, Bars, and other forms. Yousef Steel is committed to its delivery and customer service, thus ensuring that they procure the best raw materials to guarantee high strength and durability with performance specifically for critical industrial applications. Contact us anytime for your Structural Steel Sheet and Plate needs!
Alloy Steel Grade 91 coil is extensively applied in boiler fabrication, heat exchangers, superheaters, reheaters, and piping systems in thermal power generation plants and refineries. It is also appropriate for application in high-pressure steam systems and structural parts where long duration exposure to elevated temperatures is anticipated. The material’s creep resistance, oxidation, and thermal fatigue resistance make it suitable for parts that have to retain strength and integrity for prolonged periods of service. Grade 91 coils are used in applications requiring high reliability, efficiency, and conformity to new energy standards.
Yousef Steel is a leading manufacturer, supplier and exporter of high-quality Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel products. Our extensive product range includes Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates, catering to various industries in Riyadh, Saudi Arabia.
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