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Help CenterQ235B Q345B Hot Rolled Steel Round Bar Sizes 12mm-250mm for Machining
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As a leading manufacturer from Hemaokang Steel (Shandong) Co., Ltd., we specialize in supplying high-quality Q235B and Q345B Hot Rolled Steel Round Bars with diameters ranging from 12mm to 250mm. Our round bars are engineered for precision machining and demanding industrial applications, backed by ISO9001 certification and an annual export value exceeding US$50 million. With a dedicated team of 51–100 professionals and a global reach spanning North America, Europe, Asia, Africa, and Oceania, we offer reliable supply, consistent quality, and competitive pricing.
This product range covers the most common carbon steel grades used in mechanical manufacturing, construction, and general fabrication. The hot rolling process ensures a fine grain structure, improved machinability, and excellent mechanical properties. Whether you need standard sizes or custom dimensions, we provide flexible solutions to meet your production requirements.
Key Features & Technical Specifications
- Superior Material Quality: Q235B offers good plasticity and weldability; Q345B provides higher strength and toughness, ideal for load-bearing machining parts.
- Precise Diameter Tolerance: Controlled within ±0.1mm for small diameters up to ±0.5mm for larger sizes, ensuring consistent machining stock.
- Excellent Surface Finish: Hot rolled surface with minimal scale, easy to clean and ready for further processing.
- Full Size Range: Available from 12mm to 250mm in diameter, with lengths up to 12m or customized.
- Traceable Certification: Each batch comes with mill test certificates (MTC) and ISO9001 quality management system support.
- Versatile Applications: Suitable for turning, drilling, milling, threading, and other machining operations.
| Parameter | Specification |
|---|---|
| Grade | Q235B, Q345B (equivalent to ASTM A36, S235JR, S355JR) |
| Diameter Range | 12mm – 250mm |
| Length | 6m (standard), 3m–12m available upon request |
| Surface Condition | Black (hot rolled), pickled, or oiled (optional) |
| Mechanical Properties (Q235B) | Tensile Strength: 370–500 MPa; Yield ≥235 MPa; Elongation ≥26% |
| Mechanical Properties (Q345B) | Tensile Strength: 470–630 MPa; Yield ≥345 MPa; Elongation ≥21% |
| Chemical Composition (Q235B) | C ≤0.22%, Si ≤0.35%, Mn ≤1.4%, P ≤0.045%, S ≤0.045% |
| Chemical Composition (Q345B) | C ≤0.20%, Si ≤0.55%, Mn ≤1.7%, P ≤0.035%, S ≤0.035% |
Advantages for Machining Operations
Our hot rolled steel round bars are specifically designed to deliver consistent performance in machining environments. The controlled cooling process after rolling minimizes internal stress, reducing distortion during cutting. The surface condition allows for efficient chip removal and longer tool life. Additionally, the uniform grain structure ensures predictable hardness and ductility, making it easier to achieve tight tolerances.
- Cost-Effective: Competitive pricing without compromising on quality – ideal for large-scale production.
- Customizable Lengths: We can cut to your required length to minimize waste and reduce secondary processing.
- Batch Consistency: Strict quality control ensures each batch matches the specified chemical and mechanical properties.
- Global Logistics: Efficient shipping arrangements via sea, rail, or air to any major port worldwide.
Trust & Reliability – Why Choose Hemaokang Steel?
With ISO9001 certification and an annual export turnover of US$50–100 million, Hemaokang Steel (Shandong) Co., Ltd. has established a strong reputation in the global steel market. Our factory in Liaocheng, Shandong, is equipped with advanced rolling mills and testing facilities, ensuring every round bar meets rigorous standards. We serve customers across North America, South America, Europe, Africa, Oceania, Asia, and the Middle East, with a dedicated team of 51–100 employees committed to on-time delivery and responsive after-sales support.
We understand that reliability and consistency are critical for your production. That’s why we provide full traceability documentation, including mill test certificates, inspection reports, and third-party testing options. Our inventory covers all popular sizes, and we can arrange rapid dispatch for urgent orders. Contact us today to discuss your requirements and experience the Hemaokang difference.
Frequently Asked Questions (FAQ)
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What is the difference between Q235B and Q345B round bars?
Q235B is a lower strength carbon steel with good weldability, suitable for general structural and machining applications. Q345B offers higher yield and tensile strength, making it ideal for more demanding loads and heavy-duty machining. -
Can you supply round bars with diameters outside the 12mm–250mm range?
Yes, we can provide custom diameters from 8mm up to 350mm upon request. Please contact our sales team with your specific size requirements. -
How is the surface condition of hot rolled round bars?
Standard hot rolled bars have a black surface with mill scale. If you require a cleaner surface, we offer pickling, oiling, or shot blasting as optional processes. -
What certifications do you provide with each shipment?
We provide Mill Test Certificates (MTC) per EN 10204 3.1, and can arrange third-party inspection (e.g., SGS, BV) at your cost. Our ISO9001 certification ensures consistent quality management. -
Do you offer straightening or cutting services?
Yes, we can cut bars to specific lengths (e.g., 3m, 4m, 6m, or custom) and provide straightening to meet your machining requirements. Additional charges may apply. -
What is the typical lead time for orders?
For standard sizes in stock, lead time is 7–15 days. For custom sizes or large quantities, it may be 20–30 days, depending on production schedule. -
Can I request a sample before placing a bulk order?
Absolutely. We can prepare sample pieces (usually 1–2 meters) for your evaluation. Shipping costs are borne by the buyer, but we deduct the sample value from the first order. -
What payment terms do you accept?
We accept T/T, L/C, and other negotiable terms. For first-time customers, a 30% deposit and 70% balance against copy of shipping documents is typical.
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