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Help Center4140 Alloy Steel Bar 1.5m-6m Length Hot Rolled Carbon Steel Bar
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Hemaokang Steel (Shandong) Co., Ltd. is a reliable manufacturer and exporter of high-quality steel products. With an annual export value of US$50 million – US$100 million and a dedicated team of 51–100 employees, we are committed to delivering excellence. Our 4140 Alloy Steel Bar 1.5m-6m Length Hot Rolled Carbon Steel Bar is designed for demanding industrial applications, combining superior strength, toughness, and wear resistance. Whether you need precision components or heavy-duty structural parts, this product ensures consistent performance and long service life.
Manufactured under strict ISO9001:2015 quality management system, our hot-rolled 4140 steel bars are available in lengths from 1.5 to 6 meters and various diameters to meet your specific requirements. The material is widely used in the production of axles, gears, shafts, bolts, and other mechanical parts that require high strength and hardness. Below we provide detailed technical specifications and advantages of this product.
Key Features & Benefits
- Excellent Hardenability: 4140 steel responds well to heat treatment, allowing you to achieve a wide range of hardness levels (from 28–32 HRC to 50–55 HRC) depending on your application.
- High Strength & Toughness: The combination of chromium and molybdenum provides a balanced mix of tensile strength (up to 655 MPa) and impact resistance, reducing the risk of failure under heavy loads.
- Versatile Machinability: In the annealed condition, 4140 offers good machinability, making it easy to cut, drill, and turn. For improved machinability, we can supply leaded versions (4140L) upon request.
- Consistent Dimensions: Our hot-rolled bars are produced with tight tolerances (±0.5mm on diameter for standard sizes), ensuring minimal waste during fabrication.
- Customizable Lengths: Standard lengths are 1.5m, 3m, 6m, or we can cut to your exact specifications (e.g., 2.5m, 4m) with fast turnaround.
- Wide Application Range: Suitable for automotive, mining, construction, oil & gas, and general engineering industries.
Technical Specifications
| Property | Value |
| Chemical Composition (C) | 0.38 – 0.43% |
| Chemical Composition (Cr) | 0.80 – 1.10% |
| Chemical Composition (Mo) | 0.15 – 0.25% |
| Tensile Strength (annealed) | ≥ 655 MPa |
| Yield Strength (annealed) | ≥ 415 MPa |
| Elongation | ≥ 18% |
| Hardness (annealed) | ≤ 217 HBW |
| Surface Finish | Black (as-rolled) or turned/polished (optional) |
| Length Tolerance | +0 / -20 mm (standard) |
Our 4140 alloy steel bars comply with ASTM A29 and SAE J404 standards. We can also provide mill test certificates and third-party inspection reports upon request, ensuring full traceability and quality assurance.
Why Choose Hemaokang Steel?
- ISO9001 Certified Factory – Our production processes are audited regularly to maintain consistent quality.
- Large Production Capacity – With an annual export value exceeding US$50 million, we can handle both small trial orders and large container shipments (20ft/40ft).
- Global Shipping Experience – We ship from Qingdao Port to markets across North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East.
- Flexible Payment Terms – T/T, L/C, and other options are available based on your preference.
- Fast Delivery – Standard lead time is 7–15 days after deposit, depending on order quantity.
We understand that every project has unique requirements. That’s why we offer customized cutting, heat treatment (annealing, quenching, tempering), and surface treatment (turning, grinding, polishing). Our experienced technical team can also advise on the best material grade and processing method for your specific application.
Frequently Asked Questions
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What is the difference between 4140 and 4145 alloy steel?
4145 has a higher carbon content (0.43–0.48%) and higher strength, but lower toughness. 4140 is more commonly used for general-purpose applications requiring good balance of strength and ductility. -
Can you supply 4140 bars in quenched and tempered condition?
Yes, we can provide heat-treated bars (including Q&T) with specific hardness ranges (e.g., 28–32 HRC, 32–36 HRC, 36–40 HRC). Please specify your requirements. -
What is the minimum order quantity (MOQ)?
For standard sizes, MOQ is typically 1 ton (approx. 20 pieces of 6m length depending on diameter). For customized diameters or lengths, MOQ may be higher. -
Do you provide mill test certificates?
Absolutely. We supply a Mill Test Certificate (MTC) per EN 10204 3.1 or 2.2 with each shipment. Third-party inspection (e.g., SGS, BV) is also available at an extra cost. -
How long does delivery take to the United States?
Shipping via sea from Qingdao to US West Coast takes approximately 18–25 days, and to East Coast around 25–35 days. We arrange door-to-door delivery if needed. -
Can I get a sample before placing a bulk order?
Yes, we offer free samples for quality evaluation, but the buyer pays for shipping. Sample bars are usually 300mm–500mm in length. -
What is the maximum diameter available for 4140 hot-rolled bar?
Our hot-rolled diameter range is usually 20mm to 300mm. For larger diameters (up to 500mm), we can supply forged rounds or turned bars. -
Is the steel suitable for welding?
4140 alloy steel can be welded using preheat and post-weld heat treatment (PWHT) to avoid cracking. We recommend consulting a welding engineer for your specific joint design.
With ISO9001 certification and a strong track record of serving customers in over 20 countries, Hemaokang Steel (Shandong) Co., Ltd. is your trustworthy partner for alloy steel bars. We invite you to contact us for a quote or technical consultation. Let us help you find the right material for your next project.
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