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Help CenterQ235 Q345 SS400 Hot Rolled Carbon Steel Round Bar 10mm-500mm Standard Compliant Structural Use
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Hemaokang Steel (Shandong) Co., Ltd. is a reliable manufacturer and supplier of high-quality Q235, Q345, SS400 Hot Rolled Carbon Steel Round Bars with diameters ranging from 10mm to 500mm. Our round bars are designed to meet standard structural requirements, ensuring consistent performance and durability for various construction and engineering projects. With a strong annual export value of US$50-100 million and a dedicated team of 51-100 employees, we are committed to delivering products that comply with international standards.
Our hot rolled carbon steel round bars are produced using advanced manufacturing processes, offering excellent machinability, weldability, and strength. Whether you need Q235 for general structural purposes, Q345 for higher strength, or SS400 for Japanese standard applications, our inventory covers a wide range of specifications to suit your project needs.
Key Features and Benefits
- Versatile Material Grades: Available in Q235, Q345, and SS400, each with specific mechanical properties for different load-bearing requirements.
- Wide Diameter Range: From 10mm to 500mm, we can supply round bars suitable for small components to large structural members.
- Standard Compliant: Our products adhere to international standards such as GB/T 700, GB/T 1591, JIS G3101, and other relevant norms, ensuring reliability and safety.
- Excellent Processability: Hot rolled carbon steel offers good formability, welding, and cutting characteristics, making it ideal for further fabrication.
- Cost-Effective Solution: Carbon steel round bars provide a balance of strength and affordability, reducing overall project costs.
- Customizable Lengths: Standard lengths of 6m, 9m, 12m are available, and we can also cut to your specified dimensions upon request.
Technical Specifications
| Parameter | Details |
|---|---|
| Material Grade | Q235, Q345, SS400 |
| Diameter Range | 10mm – 500mm |
| Length | 6m – 12m (customizable) |
| Tensile Strength (Typical) | Q235: 370-500 MPa, Q345: 470-630 MPa, SS400: 400-510 MPa |
| Yield Strength (Min) | Q235: 235 MPa, Q345: 345 MPa, SS400: 245 MPa |
| Elongation (Min) | 20% (typical) |
| Surface Finish | Black (Oxide scale) or As-rolled |
| Application | Structural frames, bridges, machinery parts, shafts, general engineering |
| Certification | ISO9001:2015 |
Detailed Product Advantages
Superior Quality Control: Our hot rolled round bars undergo rigorous testing to ensure dimensional accuracy, chemical composition compliance, and mechanical property consistency. Each batch is traceable with mill test certificates available upon request.
Wide Application Versatility: From building construction and bridge engineering to automotive components and industrial machinery, our carbon steel round bars are trusted by clients across North America, South America, Europe, Asia, Africa, and Oceania.
Flexible Supply Capability: With an annual export value exceeding US$50 million, we handle large-volume orders with ease. Our logistic network ensures timely delivery to global ports.
Frequently Asked Questions
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Q: What is the difference between Q235, Q345, and SS400?
A: Q235 is a general-purpose carbon steel with a minimum yield strength of 235 MPa. Q345 offers higher strength (345 MPa min) and better weldability. SS400 is a Japanese standard (JIS G3101) with a tensile strength of 400-510 MPa, commonly used for structural applications. -
Q: Can you provide round bars with diameters larger than 500mm?
A: For diameters over 500mm, we can discuss custom forging or special rolling options. Please contact our sales team for availability. -
Q: Do you offer cut-to-length services?
A: Yes, we can cut round bars to your specified lengths, typically from 0.5m to 12m. Additional charges may apply for non-standard lengths. -
Q: What surface treatments are available?
A: Standard product is black (as-rolled) with oxide scale. For applications requiring a clean surface, we can offer pickling, shot blasting, or oiling upon request. -
Q: Are these round bars suitable for welding?
A: Yes, all three grades (Q235, Q345, SS400) have good weldability. Preheating and post-weld heat treatment are not typically required for standard thicknesses, but recommendations depend on the specific application. -
Q: How do I verify the quality of the steel?
A: We provide mill test certificates (MTC) for each shipment, indicating chemical composition and mechanical properties. Third-party inspection is also welcome. -
Q: What is your minimum order quantity (MOQ)?
A: MOQ varies by diameter and grade. Typically, 5-10 tons for standard sizes. For smaller quantities, please inquire. -
Q: Do you export to my country?
A: We export to all major regions worldwide. Our main markets include North America, South America, Europe, Southeast Asia, Africa, and Oceania. Contact us for shipping options and delivery times.
Why Choose Hemaokang Steel? Established in 2025, we have rapidly grown to an annual export value of US$50-100 million, serving customers in over 30 countries. Our ISO9001-certified quality management system ensures every product meets strict standards. With 51-100 experienced employees and a strategic location in Liaocheng, Shandong, we are well-positioned to provide competitive pricing, reliable supply, and professional after-sales support. Contact us today for a quote or to discuss your specific requirements. We look forward to being your trusted partner in carbon steel round bars.
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