Marzouk Steel, headquartered in Tunis, Tunisia, is a leading manufacturer and supplier of high-quality steel products, serving industries that demand durability, precision, and performance. Among its specialized offerings are Alloy Steel F91 Bars, engineered for high-temperature, high-pressure, and heavy-duty applications. Manufactured with advanced technology and stringent quality control, F91 bars provide exceptional strength, toughness, and long-term reliability. Marzouk Steel ensures that every F91 bar meets international standards, offering engineers and fabricators a dependable material for power generation, petrochemical, and industrial systems where safety, efficiency, and operational performance are critical.
Alloy Steel F91 Bars are chromium-molybdenum-vanadium (Cr-Mo-V) alloy steel designed for superior high-temperature strength, creep resistance, and thermal stability. The chemical composition includes carbon, chromium, molybdenum, and vanadium, enhancing tensile and yield strength, impact resistance, and fatigue performance. F91 bars respond well to heat treatment, allowing optimization of hardness, toughness, and mechanical properties. With excellent structural integrity under extreme conditions, F91 bars maintain durability and reliability, making them ideal for demanding industrial, mechanical, and high-performance power generation applications.
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type |
Alloy Steel ASTM A182 F91 Round Bars |
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Type |
rod, square bar, Round bar, hexagon bar, flat bar, channel bar, angle bar, threaded bar |
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Standards |
Alloy Steel ASTM A182 F91 , A479, A314, GB4226-84, GB/T1220-2007, JISG4311-91, JIS G4318-98, ENÂ 10095-99, GB4226-84, EN10088-3-2005, JIS G3033-2005, etc |
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Surface |
bright round bar, pickled round bar, black round bar |
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Package Details |
Standard seaworthy package(wooden boxes package,pvc package, or other package) |
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Technique |
Forged/Hot Rolled/Cold Drawn/Peeled |
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Range |
Range – 3.17mm to 350mm dia |
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Diameter |
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Length |
1m-9m or according to the customer’s requirement |
| Grade | C | Mn | P | S | Si | Ni | Ch | Mo | Cb | N |
|---|---|---|---|---|---|---|---|---|---|---|
| F91 | 0.08-0.12 | 0.30-0.60 | 0.020 | 0.010 | 0.20-0.50 | 0.40 | 8.0-9.5 | 0.85-1.05 | 0.06-0.10 | 0.03-0.07 |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
|---|---|---|---|---|---|
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| F91 | 585 | 415 | 20 | – | 248 max |
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Alloy Steel F91 | K90901 | 1.4903 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
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SHAPE |
POUNDS PER FOOT |
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Round |
D2 x 2.67 |
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Hexagon |
D2 x 2.945 |
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Square |
D2 x 3.4 |
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Flat |
Thickness (in.) x Width (in.) x 3.4 |
Marzouk Steel is a top manufacturer and supplier of high-quality Alloy Steel F91 Bars products in Tunis, Tunisia. Specializing in steel solutions, we provide a wide range of products, including Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel. Our offerings include Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates. Known for our reliable delivery and superior customer service, we are committed to offering top-tier steel materials that ensure durability and performance across a wide range of industrial applications. We strive to meet the highest standards, making us a trusted partner for all your steel needs.
Alloy Steel F91 Bars are widely used in industries that require high strength, thermal stability, and long-term reliability. They are commonly applied in power plants, boilers, heat exchangers, turbines, and heavy industrial machinery operating under high pressure and elevated temperatures. F91 bars are engineered to withstand extreme stress, thermal cycling, and corrosive conditions while maintaining structural integrity and mechanical performance. Engineers and fabricators rely on F91 bars for critical applications where durability, safety, and operational efficiency are essential. Their combination of toughness, creep resistance, and high tensile strength ensures reliable performance in demanding industrial environments.
Marzouk 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 Tunis, Tunisia.
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