Marzouk Steel is a reliable manufacturer and supplier of premium steel products located in Tunis, Tunisia, serving a wide range of industrial sectors. Known for quality consistency and technical know-how, Marzouk Steel supplies Alloy Steel AISI 4140 Bars that meet demanding international specifications. The company focuses on building long-term relationships by delivering materials that engineers and fabricators can trust. With efficient processing, careful quality control, and responsive customer support, Marzouk Steel ensures that every AISI 4140 bar supports strength, safety, and performance in real-world applications.
Alloy Steel AISI 4140 is a chromium-molybdenum steel with a higher carbon content than 4130, giving it increased strength and hardness. Its composition provides excellent tensile strength, impact resistance, and good fatigue performance. AISI 4140 bars offer outstanding hardenability and respond very well to heat treatment, making them suitable for high-stress environments. Despite its strength, the alloy maintains good machinability and weldability when properly treated, allowing manufacturers to achieve durability without compromising production efficiency.
Diameter :Â 8mm-3000mm
Length :Â 3,000-10,000mm
Finish :Â Bright, Polish & Black
Condition :Â Cold Drawn & Polished Cold Drawn, Centreless Ground & Polished
Form :Â Round, Square, Hex (A/F), Rectangle, Wire (Coil Form), Wire-mesh, Billet, Ingot, Forging Etc.
| Grade | C | Cr | Si | S | Mn | P | Mo | |
| AISI 4140 | min. | 0.38 | 0.8 | 0.15 | – | 0.75 | – | 0.15 |
| max. | 0.43 | 1.10 | 0.35 | 0.04 | 1.00 | 0.04 | 0.25 | |
| Grade | Tensile Strength (ksi) min | Elongation (% in 50mm) min | Yield Strength 0.2% Proof (ksi) min | Hardness |
| AISI 4140 | 855 | 20 | 621 | 197 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
| STANDARD | UNS | WERKSTOFF NR. |
| AISI 4140 | G41400 | 1.7225 |
Alloy Steel AISI 4140 Bars are widely chosen for applications where toughness and reliability are critical. They are commonly used in automotive axles, crankshafts, gears, bolts, and heavy-duty shafts. The material is also popular in oil and gas equipment, construction machinery, and industrial tooling. Thanks to its ability to withstand high loads and repeated stress, AISI 4140 is trusted for components that must perform consistently over time. Engineers appreciate this alloy for the confidence it provides in demanding, safety-critical working 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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