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Help CenterQ235B Q345B Carbon Steel Round Bar 6m Length With Mill Test Report for Construction
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As a professional manufacturer from Hemaokang Steel (Shandong) Co., Ltd., we are proud to offer our premium Q235B Q345B Carbon Steel Round Bar with a standard length of 6 meters, accompanied by a complete Mill Test Report for every batch. Established in 2025 with an annual export value of US$50–100 million, we have quickly become a reliable supplier for the global construction industry. Our round bars are produced under strict quality control, ensuring consistent mechanical properties and dimensional accuracy. Whether you need structural support for bridges, buildings, or industrial frameworks, our carbon steel round bars deliver the strength and durability your projects demand.
The Q235B and Q345B steel grades are widely recognized for their excellent weldability, formability, and cost-effectiveness. The 6-meter length is a standard size that simplifies transportation and on-site cutting, reducing waste and labor costs. Each bar comes with a Mill Test Report that certifies chemical composition and mechanical properties, giving you full traceability and peace of mind. Our products are ISO9001 certified, reflecting our commitment to quality management systems.
Key Features & Technical Specifications
- Material Grades: Q235B (mild steel) and Q345B (high-strength low-alloy steel) – both compliant with Chinese GB/T standards.
- Length: Fixed 6 meters (custom lengths available upon request).
- Diameter Range: From 20mm to 300mm (other sizes can be customized).
- Surface Finish: Black, as-rolled condition; shot blasting or painting optional.
- Mill Test Report: Provided for each heat number, including tensile strength, yield point, elongation, and chemical analysis.
- End Finish: Straight cut, no burrs.
- Packaging: Bundled with steel straps, or in containers according to customer requirements.
| Property | Q235B | Q345B |
|---|---|---|
| Tensile Strength (MPa) | 370 – 500 | 470 – 630 |
| Yield Strength (MPa) ≥ | 235 | 345 |
| Elongation (%) ≥ | 26 | 21 |
| Carbon Content (%) | ≤ 0.22 | ≤ 0.20 |
| Application | General structural, low stress | High-strength structural, bridges, towers |
Our Q235B Q345B Carbon Steel Round Bar offers several advantages for construction projects:
- Consistent quality: Each batch is tested in our in-house laboratory, and the Mill Test Report confirms compliance with international standards.
- Cost-effective: Direct from manufacturer, no middlemen – competitive pricing for bulk orders.
- Versatile: Suitable for welding, bending, and machining; ideal for rebar, columns, beams, and reinforcing structures.
- Traceability: Heat numbers are marked on each bundle, allowing full traceability from raw material to final product.
- Global logistics: Based in Liaocheng, Shandong, we have convenient access to Qingdao and Tianjin ports, ensuring timely delivery worldwide.
Why Choose Hemaokang Steel?
With 51–100 experienced employees and an annual export value exceeding US$50 million, Hemaokang Steel has built a solid reputation among clients in North America, South America, Europe, Southeast Asia, Africa, Oceania, the Middle East, and beyond. We are ISO9001:2015 certified, which means our production processes are continuously monitored and optimized. Every shipment of carbon steel round bar includes the Mill Test Report as standard – no extra charge. We believe in transparency and long-term partnerships.
Our team is ready to answer your technical questions, provide samples, or customize diameters and lengths to meet your specific needs. We also offer flexible payment terms and professional after-sales support. Contact us today to request a quote or discuss your project requirements. Let Hemaokang Steel be your trusted partner for construction-grade carbon steel round bars.
Frequently Asked Questions (FAQ)
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Q: What is the difference between Q235B and Q345B?
A: Q235B is a mild carbon steel with lower yield strength (235 MPa), suitable for general structural applications. Q345B is a high-strength low-alloy steel with yield strength of 345 MPa, offering better load-bearing capacity for demanding structures like bridges and heavy machinery. -
Q: Are the round bars delivered with a Mill Test Report?
A: Yes, every batch of our Q235B Q345B carbon steel round bar comes with a standard Mill Test Report that includes chemical composition, mechanical properties, and heat number. This is provided free of charge. -
Q: What diameters are available?
A: We offer diameters from 20mm to 300mm. Other sizes can be produced upon request with a minimum order quantity. Please contact our sales team for availability. -
Q: Can the bars be cut to custom lengths?
A: Standard length is 6 meters, but we can cut to your required length (e.g., 3m, 4m, 5m) subject to additional processing fees. Please specify when ordering. -
Q: How are the bars packaged for export?
A: Bars are bundled with steel straps and wrapped in waterproof material if needed. For sea freight, they are loaded in containers or flat racks. We follow international packaging standards to prevent damage during transit. -
Q: Do you have ISO certification?
A: Yes, our company is ISO9001:2015 certified, ensuring consistent quality management throughout production and delivery. -
Q: What is the typical lead time for an order?
A: For standard sizes (20-100mm diameter), lead time is 15-20 days after confirmation. For larger diameters or special lengths, it may take 25-30 days. We always confirm the schedule before order acceptance. -
Q: Can I get a sample before placing a bulk order?
A: Yes, we provide free samples for quality evaluation. The buyer only needs to cover the shipping cost. Contact us to arrange sample delivery.
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