Based in Houston, Texas, Luois Metals is a top producer and supplier of Alloy Steel AISI 4340 Bars/Rods. We are well-known for producing high-performance steel products, and we provide AISI 4340 bars and rods with remarkable strength, toughness, and fatigue resistance. Our products are made to exacting industry standards, come in a range of sizes and finishes, and are perfect for demanding engineering applications. Luois Metals is a reliable partner for customers in the automotive, oil and gas, aerospace, and defence industries in both domestic and foreign markets thanks to its dedication to quality, on-time delivery, and technical support.
Alloy Steel AISI 4340 Bars and Rods are made with essential alloying elements, including about 0.40% carbon, 0.75% chromium, 1.8% nickel, and 0.25% molybdenum. This unique blend gives the steel impressive hardenability and strength. Typically, the mechanical properties showcase a tensile strength between 745 to 1080 MPa and a yield strength of 470 to 930 MPa, depending on the heat treatment process. AISI 4340 is also known for its high impact toughness, fatigue resistance, and wear resistance, making it ideal for demanding load-bearing components. The steel can be quenched and tempered to enhance hardness and is machinable in both annealed and heat-treated states.
| Sizes | 2-100mm A/F |
|---|---|
| Tolerance | H9, H8, H10, K12, H13K9, K10, H11, H12, K11 |
| Round bar Sizes | Diameter: 3-~800mm |
| Technique | Hot Rolled, Cold Drawn, Cold Rolled, Forged, Rod |
| Processing | Bar cutting to 650mm |
| Surface | Bright, Hot Rolled Pickled, Sand Blasting Finished, Hairline, Cold Drawn, Polished suppliers |
| Condition | Hardened and tempered, annealed |
| Form | Precision Square, Ingot, T-Bar, Rod, Round, Welding Rod, I/H Bar, Flat Bar, Blocks, Rings, Rectangle, Hex (A/F), Hollow, Threaded, Profiles, Ground Bar, Channel Bar, Billet, Triangle, Round Rod, Half Round Bar, Forging etc. |
| Square bar Sizes | 4 to 100mm |
| Finish | Hot rolled annealed, Bright, smooth turned, Polish, Rough Turned, Cold (bright) drawn, centreless ground, Grinding, peeled, hot rolled, slit rolled edge, Centreless Ground & Black. |
| Flat bar Sizes | Width: 10 – 500 millimeter Thick.: 2 to 100 millimeter |
| Element | Composition |
|---|---|
| C% | 0.38/0.43 |
| Mn% | 0.60/0.80 |
| P% | 0.035 max |
| S% | 0.040 max |
| Si% | 0.20/0.35 |
| Ni% | 1.65/2.00 |
| Cr% | 0.70/0.90 |
| Mo% | 0.20/0.30 |
| Property | Value |
|---|---|
| Tensile Strength | 850-1000 N/mm 2 |
| Elongation | 13% |
| Hardness | 250-350 HB |
Critical applications needing high strength, toughness, and fatigue resistance use alloy steel AISI 4340 bars and rods. They are frequently utilised in the aerospace industry for engine parts, landing gear, and structural elements. They are perfect for axle shafts, gearbox gears and crankshafts in the automotive industry. AISI 4340 is used in the oil and gas sector for high-stress connectors, tool joints and drill collars. Additionally, it is used in military-grade hardware, heavy machinery, and power generation equipment. AISI 4340 is the material of choice for demanding engineering applications in harsh environments because of its exceptional mechanical qualities and hardenability.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Louis Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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