Samuel Steels, a well-respected manufacturer and supplier located in Abuja, Nigeria, specializes in high-quality Alloy Steel AISI 4140 Bars that excel in tough industrial settings. These bars are celebrated for their remarkable strength, toughness, and resistance to fatigue. Crafted from chromium-molybdenum alloy steel, they are versatile enough to be used in both annealed and heat-treated forms. Samuel Steels is committed to precision engineering, ensuring consistent mechanical properties and a top-notch surface finish for each bar, all while adhering to international quality standards. AISI 4140 Bars are perfect for sectors like oil and gas, automotive, power generation, and general engineering, where mechanical reliability is crucial.
AISI 4140 Bars are made up of carbon (0.38–0.43%), chromium (0.80–1.10%), molybdenum (0.15–0.25%), manganese (0.75–1.00%), silicon (0.15–0.35%), along with small amounts of phosphorus and sulfur. This unique blend gives the bars outstanding strength, toughness, and wear resistance. They boast a tensile strength of around 655–850 MPa, a yield strength of 415 MPa, and an elongation of about 25%. Additionally, they provide excellent hardenability, impact resistance, and fatigue strength. Thanks to their well-balanced mechanical properties, AISI 4140 Bars perform reliably even under high stress, pressure, and temperature conditions.
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 | 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 find extensive use in various industries for critical applications that demand strength and durability. They are frequently utilized in the production of crankshafts, gears, axles, shafts, studs, and connecting rods. In the oil and gas sector, these bars are perfect for drill collars and wellhead components. They also play a vital role in the automotive industry for high-performance parts, as well as in construction equipment, power plants, and general engineering. Their ability to maintain mechanical properties under heavy loads and fluctuating temperatures makes them a reliable choice for demanding applications.
Samuel 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 Abuja, Nigeria.
Copyright 2025 Samuel Steel. All rights reserved
