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Welcome to Hemaokang Steel (Shandong) Co., Ltd., your trusted partner in high-quality steel products. Our Hot Rolled Carbon Steel Round Bar in grades Q235B and Q345B is engineered to meet the rigorous demands of construction, machinery manufacturing, and structural applications. With custom lengths available and a commitment to fast delivery, we provide a reliable solution that saves you time and reduces project downtime. Each bar is produced under strict quality control, ensuring consistent mechanical properties and dimensional accuracy.
Our hot rolled carbon steel round bars are manufactured through advanced rolling processes, resulting in a dense grain structure and excellent toughness. Available in a wide range of diameters from 10mm to 300mm, these bars are suitable for use in building frames, bridges, transmission towers, and general engineering components. The Q235B grade offers good weldability and formability, while Q345B provides higher strength and better low-temperature performance, making them ideal for heavy-duty structures.
Key Features & Technical Specifications
- High Strength & Durability: Q345B grade offers minimum yield strength of 345 MPa, ensuring robust performance under load.
- Excellent Weldability: Both grades are suitable for common welding processes (SMAW, GMAW, SAW) with minimal preheating.
- Customizable Lengths: We offer lengths from 3m to 12m, or you can specify your exact requirements for seamless integration.
- Strict Tolerance Control: Diameter tolerance within ±0.5mm, length tolerance within +50mm/-0mm.
- Mill Finish Surface: Black oxide layer from hot rolling provides natural corrosion resistance during storage and transport.
- Bulk Supply Capability: Annual export value of US$50–100 million, ensuring stable inventory and fast dispatch.
Mechanical & Chemical Properties (Typical Values)
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Carbon Content (%) |
|---|---|---|---|---|
| Q235B | 235 | 370–500 | ≥26 | ≤0.20 |
| Q345B | 345 | 470–630 | ≥22 | ≤0.20 |
Available Dimensions & Customization Options
- Diameter Range: 10mm, 12mm, 16mm, 20mm, 25mm, 32mm, 40mm, 50mm, 60mm, 80mm, 100mm, 120mm, 150mm, 200mm, 250mm, 300mm – other sizes upon request.
- Length Options: Standard 6m/12m, or custom cut-to-length (minimum 1m, maximum 12m).
- Surface Treatment: Mill finish; optional pickling, oiling, or rust-proof coating available for export.
- Packaging: Bundled with steel straps or in woven bags, container loading according to customer requirements.
Benefits for Your Business
By choosing our hot rolled carbon steel round bars, you gain several competitive advantages:
- Reduced Inventory Costs: Custom lengths mean less waste and lower storage expenses.
- Faster Project Completion: Ready stock and efficient logistics ensure delivery within 7–15 days.
- Consistent Quality: ISO9001 certified production process guarantees uniform properties across batches.
- Global Reach: Serving markets across North America, South America, Europe, Africa, Asia, and Oceania with proven export experience.
Why Partner with Hemaokang Steel?
Established in 2025, Hemaokang Steel (Shandong) Co., Ltd. has quickly become a reliable supplier of carbon steel products. With an annual export value ranging from US$50 million to US$100 million and a dedicated team of 51–100 employees, we are well-equipped to handle large-volume orders with precision. Our ISO9001 certification reflects our commitment to quality management, and our extensive market coverage—from domestic China to over 14 regions worldwide—demonstrates our global competence. We prioritize customer satisfaction through transparent communication, flexible customization, and on-time delivery.
Whether you need a small batch for a local project or bulk supply for a large infrastructure development, we are ready to support you. Contact us today to discuss your specific requirements, request a quotation, or arrange a sample test. Let Hemaokang Steel be your reliable partner in steel.
Frequently Asked Questions (FAQ)
Q1: What is the difference between Q235B and Q345B round bars?
A: Q235B is a general-purpose carbon steel with minimum yield strength of 235 MPa, suitable for light structures. Q345B offers higher strength (345 MPa) and better low-temperature toughness, making it ideal for heavy-duty applications like bridges and high-rise buildings.
Q2: Can you cut the round bars to my exact length?
A: Yes, we offer custom lengths from 1m to 12m. Please specify your required length when placing the order, and we will cut accordingly with a tolerance of +50mm/-0mm.
Q3: What is the typical delivery time for an order?
A: For standard sizes and quantities, delivery usually takes 7–15 days after order confirmation. Large or custom orders may require 15–25 days. We always expedite to meet your project schedule.
Q4: Do you provide any certificates or test reports?
A: Yes, we can provide a Mill Test Certificate (MTC) for each batch, including chemical composition and mechanical properties. Our ISO9001 certification is also available upon request.
Q5: What is the minimum order quantity (MOQ)?
A: For standard diameters, the MOQ is 1 ton. For non-standard sizes or special lengths, please contact our sales team for a tailored quotation.
Q6: How are the round bars packaged for export?
A: They are bundled with steel straps, wrapped in woven bags or plastic sheeting, and secured in containers. Rust-proof coating or oiling can be applied upon request for long sea voyages.
Q7: Can you supply round bars with different surface finishes?
A: The standard surface is mill finish (black). We also offer pickled and oiled, galvanized, or painted finishes as optional services. Please inquire for details.
Q8: Which countries do you export to?
A: Our main markets include North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and Western Europe. We also serve the domestic Chinese market. We are experienced in handling international shipping and customs documentation.
Contact us now to get a competitive quote and experience reliable service from Hemaokang Steel.
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