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Help CenterQ235B Carbon Steel Round Bar 8-200mm Cold Drawn Bright Steel Bar With Mill Test Report
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Hemaokang Steel (Shandong) Co., Ltd. is proud to offer high-quality Q235B Carbon Steel Round Bar in diameters from 8mm to 200mm, produced through advanced cold drawn technology. As a company with an annual export value of US$50-100 million, we ensure every bar meets rigorous standards and comes with a complete Mill Test Report. Our bright steel bars combine precise dimensional accuracy, excellent surface finish, and reliable mechanical properties – ideal for industries ranging from automotive to general engineering.
The Q235B carbon steel round bar is manufactured under strict quality control, using premium raw materials sourced from reputable domestic mills. The cold drawn process enhances the surface finish and improves dimensional tolerances, making it suitable for applications that require minimal post-processing. Whether you need standard lengths or custom dimensions, our flexible production capacity ensures timely delivery from Qingdao port to global markets.
Key Features & Technical Specifications
- Superior Surface Quality: Cold drawn process delivers a smooth, bright surface free from scale and defects.
- Precise Dimensional Control: Tolerances as tight as h9 are achievable – perfect for precision machining.
- Consistent Mechanical Properties: Yield strength ≥235 MPa, tensile strength 370–500 MPa (typical for Q235B).
- Mill Test Report Included: Each batch is tested and documented for chemical composition, tensile, and hardness.
- Wide Size Range: From 8mm to 200mm diameter – one-stop sourcing for diverse needs.
- Customizable Lengths: Available in 1m, 3m, 6m, 12m or as per your request.
- Packaging Options: Bundled with steel straps or in waterproof wooden crates for sea transport.
| Property | Value |
|---|---|
| Material Grade | Q235B (equivalent to A36, S235JR) |
| Diameter Range | 8mm – 200mm |
| Surface Condition | Bright (Cold Drawn) |
| Standard | GB/T 700 (or equivalent international standards) |
| Length Tolerance | +0/-50 mm for fixed lengths |
| Straightness | ≤1mm/m |
| Chemical Composition | C ≤0.20%, Si ≤0.35%, Mn 0.30-0.70%, P ≤0.045%, S ≤0.045% |
| Typical Application | Shafts, bolts, pins, hydraulic components, structural parts |
Benefits for Your Business
- Cost Efficiency: Cold drawn bright bars require less machining, reducing your production costs.
- Reliable Supply: With an annual export capacity exceeding US$50 million, we can handle large orders with consistent quality.
- Global Reach: Our products are shipped to North America, South America, Europe, Southeast Asia, Africa, Oceania, and more – supported by a professional team of 51-100 employees.
- Full Traceability: Every bar is traceable via the Mill Test Report, ensuring compliance with your quality requirements.
- Flexible Packaging: Choose from standard bundles, wooden crates, or custom packaging to suit your handling needs.
Why Choose Hemaokang Steel? Since our establishment in 2025, we have quickly built a reputation for delivering high-quality steel products backed by ISO9001 quality management system. Our location in Liaocheng, Shandong – a major steel production hub – gives us a raw material cost advantage. From small trial orders to large container shipments, we ensure every client receives professional service and on-time delivery. The Q235B carbon steel round bar with mill test report is one of our most demanded products – trusted by engineers worldwide for its consistent performance.
We invite you to contact us for a quotation or technical documentation. Our sales team is ready to discuss your specific diameter, length, and packaging requirements. Let Hemaokang Steel be your reliable partner for bright steel bars.
Frequently Asked Questions
-
Q: What is the difference between Q235B and Q235A?
A: Q235B has stricter requirements for impact toughness at low temperature (-20°C) compared to Q235A, making it more suitable for structural applications in colder environments. -
Q: Are the bars straight enough for CNC machining?
A: Yes, our cold drawn round bars have a straightness tolerance of ≤1mm/m, which is suitable for most CNC lathe and milling operations. Tighter tolerances can be offered upon request. -
Q: Do you provide the Mill Test Report for every batch?
A: Absolutely. A Mill Test Report (MTR) is included with every shipment, detailing chemical composition, mechanical properties, and heat number for full traceability. -
Q: What is the minimum order quantity?
A: We accept both small and large orders. Minimum order quantity is typically 1 ton for standard sizes, but smaller quantities can be arranged for sample orders. -
Q: How long does shipping take from Qingdao port?
A: Typical lead time is 15-25 days after order confirmation, depending on quantity and destination. We work with reliable freight forwarders to ensure timely delivery. -
Q: Can you cut the bars to custom lengths?
A: Yes, we can cut to your specified lengths, usually within ±0.5mm tolerance for small diameters, or ±1mm for larger diameters. Please advise your required length when ordering. -
Q: Is this product equivalent to ASTM A36 or S235JR?
A: Q235B is often considered equivalent to ASTM A36 and EN S235JR in terms of chemical composition and mechanical properties, but we recommend checking your local standard requirements. Our MTR can help you compare. -
Q: What packaging do you use for sea freight?
A: We use steel strapped bundles for small diameters and wooden crates with waterproof wrapping for larger diameters or fragile surface requirements. Custom packaging is available.
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