Chung Metal Manufacturer & Suppliers in Da Nang manufactures premium-quality Alloy Steel AISI 4140 bars and rods for applications that require strength, toughness, and resistance to fatigue. Also referred to as a versatile chromoly steel, 4140 is highly performant across a broad spectrum of applications. We offer rods in various diameters, finishes, and hardness conditions, certified with comprehensive test reports and metallurgical examinations. Our extensive experience guarantees that every 4140 rod satisfies mechanical requirements and consistent microstructure. Mechanical engineering, automotive, oil & gas, and heavy machinery clients rely on our stock of 4140 to fabricate critical components.
AISI 4140 is chromium–molybdenum alloy steel with ~0.38–0.43% C, 0.80% Cr, 0.15% Mo, along with Mn, Si. Tensile strength in quenched and tempered condition is ~900–1,100 MPa, yield strength ~700–900 MPa, and elongation ~12–20%. It attains hardness ~230–300 HB or ~28–40 HRC depending on the temper. The alloy possesses good toughness, impact strength, resistance to fatigue, and machinability. It can be welded easily (with preheating), and responds favorably to case hardening or surface treatments.
| Dimensions | : | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Size | : | 5 mm To 500 mm |
| Diameter | : | 0.1 mm to 100 mm |
| Length | : | 100 mm To 3000 mm Long & Above |
| Finish | : | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Tolerance | : | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements |
| Form | : | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc. |
| Grade | C | Mn | Si | P | S | Fe | Mo | Ni | Cr |
| AISI / SAE 4140 | 0.38-0.43 | 0.75-1.00 | 0.20-0.35 | 0.035 max | 0.035 MAX | – | – | 0.15-0,25 | 0.80-1.10 |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.85 g/cm3 | 1432 ℃ | 560 | 460 | 21.50% |
Alloy Steel AISI 4140 Bars and Rods are known for their excellent strength, toughness, and wear resistance. With a chemical composition that includes chromium and molybdenum, they offer improved hardness, fatigue resistance, and good machinability, making them ideal for demanding applications.
AISI 4140 Bars and Rods are commonly used in automotive, aerospace, oil and gas, construction, and heavy machinery industries. They are ideal for manufacturing parts such as gears, shafts, crankshafts, and axles that require high strength and durability.
Yes, Alloy Steel AISI 4140 Bars and Rods can be heat treated to achieve desired mechanical properties. Heat treatment processes such as quenching and tempering can increase hardness, strength, and toughness, making the material suitable for high-stress applications.
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | EN |
| AISI / SAE 4140 | 1.7225 | G41400 | SCM 440 | BS 708M40 | 1.7223 |
The Alloy Steel AISI 4140 bars and rods find broad application in shafts, gears, bolts, axles, and structural elements. In automotive and heavy-duty equipment, utilized in crankshafts, camshafts, drive shafts, and gear blanks. In oil & gas, utilized for drilling rods, pump shafts, and couplings. The alloy is also prevalent in tooling, rolls, and heavy machinery components. Due to its toughness and fatigue, 4140 is applied in construction machinery, mining equipment, and hydraulic cylinders. Surface treatment improves its wear resistance for high-load applications.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Chung Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Da Nang, Vietnam
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