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Help CenterHot Rolled Round Bar Q235B Q345B for Machinery Parts and Shaft Manufacturing
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Hemaokang Steel (Shandong) Co., Ltd. is proud to present our premium Hot Rolled Round Bar Q235B Q345B, specifically designed for machinery parts and shaft manufacturing. As a reliable steel supplier established in 2025, we combine modern production techniques with strict quality control to deliver round bars that meet the exacting demands of industrial applications. Our annual export value of US$50 million to US$100 million and a global customer base across North America, South America, Europe, Asia, Africa, and Oceania reflect our commitment to providing durable, high-performance materials. Whether you need robust load-bearing shafts or precision-machined components, our Q235B and Q345B round bars offer a cost-effective solution with excellent mechanical properties.
Key Features & Technical Advantages
- Superior Strength and Weldability: Q235B offers good tensile strength (375-500 MPa) and excellent weldability, making it ideal for structural parts. Q345B provides higher yield strength (≥345 MPa) for applications requiring greater load capacity.
- Consistent Dimensional Accuracy: Rolled to strict tolerances per GB/T 702 standard, ensuring uniform diameter and straightness, reducing secondary processing time.
- Versatile Surface Finishes: Available in black (as-rolled), bright (peeled), or polished finish to suit different machining requirements.
- Customizable Length and Diameter: Standard diameters from 20mm to 300mm, lengths from 3m to 12m, with custom cutting services available upon request.
- Excellent Machinability: The material composition allows for efficient turning, drilling, and milling, perfect for producing gears, pins, rollers, and shafts.
- Certified Quality: Our products are manufactured under an ISO9001:2015 certified quality management system, ensuring traceability and consistency.
Typical Mechanical Properties (Reference)
| Grade | Yield Strength (≥ MPa) | Tensile Strength (MPa) | Elongation (≥ %) |
| Q235B | 235 | 375-500 | 26 |
| Q345B | 345 | 470-630 | 21 |
Benefits for Your Manufacturing Process
- Reduced Scrap Rate: Tight tolerances and consistent quality minimize material waste during machining.
- Higher Productivity: Excellent machinability means faster cutting speeds and longer tool life.
- Reliable Supply Chain: With 51-100 skilled employees and strong production capacity, we ensure timely delivery even for large orders.
- Cost-Effective Choice: Q235B and Q345B offer an optimal balance between performance and price for non-critical and medium-stress applications.
Trusted by Global Industries
Hemaokang Steel has built a reputation for delivering consistent quality to customers in over 15 major markets, including the domestic Chinese market. Our ISO9001 certification and annual export volume of US$50–100 million demonstrate our reliability. We use advanced testing equipment to verify chemical composition and mechanical properties on every batch. From automotive shafts to agricultural machinery components, our hot rolled round bars are the first choice for manufacturers who demand dependability.
Frequently Asked Questions
Q1: What is the difference between Q235B and Q345B round bars?
A1: Q235B has lower yield strength (235 MPa) and is more weldable, suitable for general structural parts. Q345B has higher strength (≥345 MPa) and is used for load-bearing shafts and machinery components that require greater resistance to deformation.
Q2: Can you supply round bars with a diameter larger than 300mm?
A2: Yes, we can produce larger diameters on a custom order basis. Please contact our sales team with your specific requirements.
Q3: Are your round bars suitable for heat treatment?
A3: Both grades are carbon-manganese steels that can be normalized, annealed, or quenched and tempered. However, for components requiring deep hardening, we recommend consulting our technical team about grade selection.
Q4: What packaging options do you offer for export?
A4: Standard packaging is steel-strip bundling with waterproof wrapping. For sea freight, we also provide anti-rust coating and wooden crates as optional services.
Q5: Do you provide third-party inspection reports?
A5: Yes, we can arrange SGS, BV, or other independent inspections at your cost. Mill test certificates are included with each shipment.
Q6: What is the typical lead time for a 20-ton order?
A6: For standard sizes (20-200mm diameter), lead time is 15-20 working days after confirmation. Custom sizes may require 25-30 days.
Q7: Can I get samples before placing a bulk order?
A7: Yes, we offer free samples for pre-qualification (shipping charges apply). Please request through our B2B page.
Q8: Do your round bars meet international standards like ASTM or EN?
A8: While our primary standard is GB/T (Chinese national standard), we can produce to ASTM A36, A572, or EN 10025 equivalents upon request. Check with our team for grade mapping.
Choose Hemaokang Steel as your trusted partner for Hot Rolled Round Bar Q235B Q345B. Contact us today for competitive pricing and expert technical support!
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