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Help CenterQ235 Q345B Carbon Steel Rod Hot Rolled Round Bar Custom Tolerance 10mm-300mm for Machining
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Reliable Hot Rolled Carbon Steel Round Bars from a Trusted Chinese Manufacturer
Welcome to Hemaokang Steel (Shandong) Co., Ltd., a professional steel supplier located in Liaocheng, Shandong, China. Since our establishment in 2025, we have rapidly grown into a leading exporter of high-quality carbon steel products, with an annual export value reaching US$50–100 million. Our Q235 and Q345B hot rolled round bars are designed for machining and general engineering applications, offering exceptional strength, excellent weldability, and consistent dimensional accuracy. With a diameter range of 10mm to 300mm and customizable tolerance options, our round bars meet the demanding needs of workshops, fabricators, and industrial end-users across global markets.
Every bar we supply is produced through rigorous hot rolling processes under strict quality control, ensuring a sound internal structure and smooth surface finish. Whether you need bars for automotive parts, shafts, bolts, structural supports, or general machining, our material delivers stable performance and cost-efficient value. We understand that precise specifications are critical to your production line — that is why we offer flexible tolerance options and customized lengths to match your exact blueprints.
Key Product Features and Technical Advantages
- High Strength & Durability: Q345B offers a minimum yield strength of 345 MPa, making it suitable for load-bearing structures and high-stress machining components, while Q235 provides a cost-effective solution for general purpose parts.
- Wide Size Range: Diameters from 10mm to 300mm cover everything from precision small parts to heavy industrial shafts.
- Customizable Tolerance: We can supply bar tolerances per DIN, ASTM, or GB standards, and even tighter custom tolerances upon request for high-precision machining operations.
- Good Machinability: The controlled carbon content ensures consistent hardness and chip formation, reducing tool wear and improving surface finish in turning, milling, and drilling.
- Excellent Weldability: Both Q235 and Q345B are known for robust weldability, enabling easy fabrication into frames, supports, and other components.
- Flexible Length Options: Available in standard lengths of 6m, 9m, 12m, or custom-cut lengths to minimize material waste.
- Surface Finish Options: Hot rolled black surface is standard; we also offer peeled, turned, or polished surfaces for applications requiring a clean aesthetic or minimal machining allowance.
- Consistent Quality: Our production process is supervised under ISO9001 certified management systems, ensuring every batch meets uniform mechanical properties and chemical composition.
Technical Specifications & Dimensional Tolerances
| Parameter | Q235 | Q345B |
|---|---|---|
| Yield Strength (min) | 235 MPa | 345 MPa |
| Tensile Strength | 375–500 MPa | 470–630 MPa |
| Elongation (min) | 26% | 20% |
| Diameter Range | 10–300 mm | 10–300 mm |
| Length | Custom (2m–12m) | Custom (2m–12m) |
| Tolerance Standard | GB/T / DIN / ASTM or custom | GB/T / DIN / ASTM or custom |
Application Areas
Our hot rolled round bars are widely used in the following fields:
- Machining Industry: Production of pins, shafts, gears, threaded rods, and precision-turned components.
- Construction & Structural Engineering: Fabrication of brackets, anchors, and supporting frames.
- Automotive & Transportation: Axle blanks, connectors, and chassis parts that require high tensile strength.
- Agricultural Equipment: Cultivator shanks, shafts, and pivot points exposed to wear.
- General Fabrication: Custom welding assemblies, railings, and mechanical structures.
Quality Control and Packaging
All bars are subject to chemical analysis, mechanical testing, and dimensional inspection before shipping. We can provide mill test certificates and full test reports upon request. Products are bundled with steel strips or packed in seaworthy wooden cases, protecting the surface from scratches and rust during long-distance shipping. Marking and tagging are available according to buyer requirements.
Why Choose Hemaokang Steel?
- ISO9001 Certified: Our quality management system meets the ISO9001 standard, ensuring traceability and consistent product quality.
- Strong Export Experience: With annual export value of US$50–100 million, we serve clients across North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and many other regions.
- Fast & Flexible Supply: Our 51–100 person team is experienced in handling both standard and urgent orders, customizing sizes and specifications to reduce your sourcing time.
- Competitive Pricing: Direct mill cooperation and optimized logistics enable us to provide cost-effective prices without compromising on material quality.
- Shipment from Qingdao Port: Convenient export logistics guarantee timely and safe delivery worldwide.
We believe in building long-term partnerships based on honesty, reliability, and superior product support. Whether you are a machinery manufacturer, workshop, or trading company, our team is ready to assist with sample requests, technical consultation, and tailor-made solutions. Contact us today to discuss your specific requirement for Q235/Q345B hot rolled round bars — we will respond within 24 hours with a competitive quotation and delivery schedule.
Frequently Asked Questions (FAQ)
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Q: Can you supply round bars with a custom diameter not listed in your range?
A: Yes, we produce most diameters between 10mm and 300mm. If you need a specific diameter within this range, we can make it to order. Sizes outside this range may be available upon request. -
Q: What is the minimum order quantity (MOQ) for these round bars?
A: Our MOQ is generally 5 tons per size. For trial orders or special diameters, please contact our sales team; we often accommodate smaller quantities to help you evaluate our quality. -
Q: Can you provide a mill test certificate?
A: Yes, we provide a mill test certificate (MTC) for every batch. The certificate includes chemical composition, mechanical properties, and heat number traceability. -
Q: What tolerance can you offer for high-precision machining?
A: Standard tolerance is according to GB/T702 or similar. We can also supply with straightness tolerance and diameter tolerance customized to your machining requirements. Contact us with your drawing for a detailed assessment. -
Q: How do you prevent rust during ocean shipment?
A: We apply anti-rust oil on the bar surface (optional) and wrap them in waterproof paper or plastic film. For longer transit times, we can add VCI packaging on request. -
Q: Do you support third-party inspection?
A: Absolutely. We have experience with SGS, BV, and other independent inspectors. The inspection scope can include chemical testing, dimensional checks, and visual surface inspection. -
Q: What is your usual delivery time?
A: For standard sizes in stock, delivery takes about 7–10 days. For production orders, it is typically 15–30 days after receiving the deposit, depending on the quantity and specification. -
Q: Can you supply polished or peeled round bars for precise shaft applications?
A: Yes, we offer peeled, turned, and polished surface finishes as optional services. These processes remove the scale layer and provide tighter diameter tolerances for machining centers.
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