Marzouk Steel, headquartered in Tunis, Tunisia, is a trusted manufacturer and supplier of high-quality steel products, serving industries that demand precision, strength, and long-term reliability. Among its specialized offerings are Alloy Steel F911 Bars, designed for ultra-high-temperature and high-pressure applications. Manufactured with advanced technology and strict quality control, F911 bars deliver exceptional mechanical performance, toughness, and durability. Marzouk Steel ensures that every F911 bar meets international standards, providing engineers and fabricators with a dependable material for power generation, petrochemical, and heavy industrial systems where safety, efficiency, and performance are critical.
Alloy Steel F911 Bars are chromium-molybdenum-vanadium (Cr-Mo-V) alloy steel engineered for outstanding high-temperature strength, creep resistance, and thermal stability. Their chemical composition includes carbon, chromium, molybdenum, and vanadium, enhancing tensile and yield strength, impact resistance, and fatigue performance. F911 bars respond effectively to heat treatment, optimizing hardness, toughness, and mechanical properties. With excellent structural integrity under extreme conditions, F911 bars maintain reliability and long-term durability, making them ideal for demanding industrial, power generation, and high-performance applications.
Diameter : 8mm-3000mm
Length : 3,000-10,000mm
Finish : Bright, Polish & Black
Condition : Cold Drawn & Polished Cold Drawn, Centreless Ground & Polished
Form : Round, Square, Hex (A/F), Rectangle, Wire (Coil Form), Wire-mesh, Billet, Ingot, Forging Etc.
| Grade Symbol | UNS Number | Alloy | Elements | Composition % |
|---|---|---|---|---|
| F911 | K91061 | 9% chromium, 1% molybdenum, 0.2% vanadium plus columbium and nitrogen | Carbon | 0.09 – 0.13 |
| Manganese | 0.30 – 0.60 | |||
| Phosphorus | 0.020 max | |||
| Sulfur | 0.010 max | |||
| Silicon | 0.10 – 0.50 | |||
| Nickel | 0.40 max | |||
| Chromium | 8.5 – 9.5 | |||
| Molybdenum | 0.90 – 1.10 | |||
| Columbium | 0.060 – 0.10 | |||
| Tungsten | 0.90 – 1.10 | |||
| Aluminium | 0.02 max | |||
| Nitrogen | 0.04 – 0.09 | |||
| Vanadium | 0.18–0.25 | |||
| Boron | 0.0003 – 0.006 | |||
| Titanium | 0.01 max | |||
| Zirconium | 0.01 max |
| Property | Value |
|---|---|
| Tensile Strength, min, ksi [MPa] | 90 [620] |
| Yield Strength, min, ksi [MPa] | 64 [440] |
| Elongation in 2 in. [50mm] or 4D, min, % | 18 |
| Reduction or Area, min, % | 40 |
| Brinell Hardness Number, HBW | 187-248 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Alloy Steel F911 Bars are widely used in industries requiring high strength, temperature resistance, and long-term reliability. They are commonly applied in ultra-supercritical boilers, turbines, heat exchangers, high-pressure pipelines, and heavy industrial machinery exposed to high temperature and stress. F911 bars are engineered to withstand extreme thermal and mechanical conditions while maintaining structural integrity and performance. Engineers and fabricators rely on F911 bars for critical applications where safety, efficiency, and operational longevity are essential. Their combination of toughness, creep resistance, and tensile strength ensures dependable performance in demanding industrial and mechanical 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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