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Help CenterCarbon Steel Round Bar Q235B Q345B 20mm-100mm Diameter 6m Standard Length
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Professional Carbon Steel Round Bar Supplier
Hemaokang Steel (Shandong) Co., Ltd., established in 2025, is a trusted manufacturer and exporter of high-quality carbon steel round bars. Our Q235B and Q345B round bars, with diameters ranging from 20mm to 100mm and standard 6m length, are designed to meet the rigorous demands of global construction, engineering, and manufacturing industries. Backed by an annual export value of US$50-100 million and a dedicated team of 51-100 employees, we ensure consistent quality, competitive pricing, and timely delivery to customers across North America, South America, Europe, Africa, Oceania, and Asia.
Product Features & Technical Specifications
- High Strength & Durability: Q235B and Q345B grades offer excellent tensile strength and weldability, suitable for structural applications.
- Precision Dimensions: Diameters from 20mm to 100mm with tight tolerances (±0.5mm) ensure consistent performance.
- Standard Length: 6m per bar, with customizable lengths available upon request.
- Surface Options: Black (as-rolled) finish standard; galvanized or painted finishes available as optional.
- Compliance: Manufactured in accordance with GB/T 700 standard, meeting international quality requirements.
- Versatile Applications: Ideal for building frames, bridges, vehicle parts, machinery components, and general fabrication.
| Parameter | Specification |
|---|---|
| Material Grade | Q235B, Q345B |
| Diameter Range | 20mm – 100mm |
| Standard Length | 6m (customizable) |
| Tensile Strength (Q235B) | 370-500 MPa |
| Tensile Strength (Q345B) | 470-630 MPa |
| Yield Strength (Q235B) | ≥235 MPa |
| Yield Strength (Q345B) | ≥345 MPa |
| Surface Finish | Black, galvanized, or painted (optional) |
Key Advantages for Your Business
- Cost-Effective: Direct factory pricing eliminates middlemen, saving you up to 15% compared to market average.
- Stable Supply: With annual export value exceeding US$50 million, we maintain large inventory and reliable production capacity.
- Quality Assurance: Our ISO9001-certified management system ensures every batch undergoes rigorous inspection for chemical composition, mechanical properties, and dimensional accuracy.
- Global Reach: We ship to over 10 major markets worldwide, with experienced logistics partners ensuring safe and timely delivery.
- Customization: Non-standard diameters, lengths, and surface treatments are available upon request to meet your specific project needs.
Trust & Reliability
Hemaokang Steel (Shandong) Co., Ltd. has built a strong reputation since 2025 through our commitment to quality and customer satisfaction. Our team of 51-100 skilled professionals works tirelessly to ensure every product meets the highest standards. With a yearly export turnover between US$50 million and US$100 million, we serve diverse markets including North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, and the Middle East. We invite you to experience the difference of working with a reliable partner. Contact us today for a quote or to discuss your custom requirements.
Frequently Asked Questions
Q1: What is the difference between Q235B and Q345B steel round bars?
A: Q235B is a mild carbon steel with lower yield strength (≥235 MPa), suitable for general structural applications. Q345B has higher strength (≥345 MPa) and better toughness, ideal for heavy-duty structures like bridges and high-rise buildings.
Q2: Do you offer non-standard diameters or lengths?
A: Yes, we can customize diameters within 20-100mm and lengths up to 12m based on your order quantity. Please contact us for specific requirements.
Q3: What surface treatments are available?
A: Standard is black (as-rolled). We also offer galvanized, painted, or oiled finishes as optional. The choice depends on your corrosion protection needs.
Q4: How do you ensure product quality?
A: Our factory is ISO9001 certified. Each batch is tested for chemical composition, tensile strength, yield strength, and dimensional tolerances. We provide mill test certificates upon request.
Q5: What is the minimum order quantity (MOQ)?
A: For standard sizes, MOQ is 5 tons. For customized sizes, MOQ may be higher. Please contact us to discuss your needs.
Q6: Do you ship to my country?
A: We export to all major regions including North America, South America, Europe, Africa, Asia, and Oceania. Our logistics team can arrange sea, air, or land freight to your port.
Q7: Can you provide samples before bulk order?
A: Yes, we offer free samples for quality evaluation. You only need to cover the shipping cost.
Q8: What payment terms do you accept?
A: We accept T/T (30% deposit, 70% before shipment), L/C at sight, and other negotiable terms for established clients.
Contact Us
Hemaokang Steel (Shandong) Co., Ltd.
Liaocheng, Shandong, China
Email: [your email] | Phone: [your phone]
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