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Help CenterAlloy Steel Coil 4140 4340 1.5-12mm Hot Rolled 1000-2000mm Width High Strength
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Welcome to Hemaokang Steel (Shandong) Co., Ltd., an ISO9001 certified manufacturer specializing in high-quality alloy steel products. Established in 2025, we have rapidly grown to achieve an annual export value of US$50–100 million, serving customers across North America, South America, Europe, Asia, Africa, and Oceania. Our Alloy Steel Coil 4140/4340 in hot-rolled condition offers exceptional strength, durability, and consistent performance for demanding industrial applications. With thickness ranging from 1.5mm to 12mm and width from 1000mm to 2000mm, this coil is designed to meet the rigorous requirements of automotive, machinery, and structural engineering sectors.
Our product stands out for its superior mechanical properties and reliable quality. The 4140 and 4340 alloy steel grades are known for their high tensile strength, good fatigue resistance, and excellent hardenability. The hot-rolled surface finish ensures optimal formability and weldability, making it ideal for further processing into shafts, gears, fasteners, and other critical components. Each coil is produced under strict quality control, with dimensions precisely controlled to meet customer specifications.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Grade | 4140 / 4340 |
| Thickness | 1.5 – 12 mm |
| Width | 1000 – 2000 mm |
| Surface Condition | Hot Rolled (Pickled & Oiled optional) |
| Standard | ASTM A29, A322 / EN 10083 (available upon request) |
| Certification | ISO9001 |
Typical Mechanical Properties (4140 Quenched & Tempered)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 850 MPa |
| Yield Strength | ≥ 650 MPa |
| Elongation | ≥ 12% |
| Hardness (HB) | 280 – 320 |
Product Advantages & Benefits:
- High Strength & Durability: The alloy composition of 4140/4340 provides excellent tensile and yield strength, ensuring long service life under heavy loads.
- Wide Size Range: Thickness from 1.5mm to 12mm and width up to 2000mm offer flexibility for various applications, reducing material waste.
- Excellent Hardenability: Suitable for heat treatment processes like quenching and tempering to achieve desired hardness levels.
- Good Weldability & Formability: Hot-rolled condition allows for easy forming, bending, and welding without cracking.
- Consistent Quality: ISO9001 certified production ensures uniform thickness, flatness, and surface finish across every coil.
- Cost-Effective: Direct from manufacturer with competitive pricing and reliable supply chain.
Our alloy steel coils are widely used in the manufacturing of automotive components (axles, gears, crankshafts), heavy machinery parts, structural supports, and oil & gas equipment. The combination of high strength and good toughness makes them a preferred choice for engineers seeking reliable material performance.
At Hemaokang Steel, we take pride in our professional team of 51–100 employees and our expansive global market reach. With annual exports exceeding US$50 million, we have built a reputation for delivering products on time and meeting international quality standards. Our ISO9001 certification demonstrates our commitment to continuous improvement and customer satisfaction.
Trust & Credibility: Since our establishment in 2025, we have maintained strong partnerships with clients across North America, South America, Europe, Africa, Asia, and Oceania. Our Liaocheng, Shandong facility is equipped with advanced production lines and testing equipment, ensuring every coil meets rigorous specifications. Whether you need standard sizes or customized dimensions, we can accommodate your requirements.
Contact us today for a quote or technical consultation. Let Hemaokang Steel be your reliable partner for high-strength alloy steel coils.
Frequently Asked Questions (FAQ)
-
Q: What is the minimum order quantity (MOQ) for this alloy steel coil?
A: Our MOQ is typically 25 tons per size, but we may accept smaller trial orders upon request. Please contact our sales team for details. -
Q: Can you provide coils with specific dimensions outside the standard range?
A: Yes, we offer customization within our production capabilities. Thickness and width can be adjusted subject to technical feasibility. Please inquire with your specific requirements. -
Q: How is the coil packaged for export?
A: Standard export packaging includes inner protective wrapping, steel strapping, and outer waterproof material. Additional packaging options (e.g., wooden crates) are available on request. -
Q: What is the typical lead time for production and delivery?
A: Lead time is usually 15–25 days after order confirmation, depending on quantity and specification. We also offer express delivery for urgent orders. -
Q: Are these coils suitable for heat treatment? What hardness can be achieved?
A: Yes, 4140 and 4340 are designed for heat treatment. After quenching and tempering, hardness can reach 280–320 HB (or higher with specialized processes). We can provide recommendations based on your target hardness. -
Q: Do you provide mill test certificates or third-party inspection reports?
A: Yes, we supply mill test certificates with each shipment. Third-party inspection (e.g., SGS, BV) is also available at an additional cost. -
Q: What is the surface finish of the hot-rolled coil? Is it pickled or oiled?
A: Standard hot-rolled surface has a dark oxide scale. We can provide pickled and oiled (P&O) finish upon request for improved surface quality and corrosion resistance. -
Q: Do you accept small sample orders for testing?
A: Yes, we can provide samples (e.g., 1–2 tons) for evaluation. Sample orders are subject to availability and shipping costs.
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