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Help CenterHot Rolled Round Bar Q235B Q345B 10mm-300mm Diameter Customizable Length
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Hemaokang Steel (Shandong) Co., Ltd., established in 2025 with an annual export value exceeding US$50 million, is proud to present our premium Hot Rolled Round Bar Q235B Q345B. With a manufacturing base in Liaocheng, Shandong, China, we specialize in producing high-quality carbon steel round bars that meet the rigorous demands of global construction, machinery, and energy sectors. Our products are available in diameters ranging from 10mm to 300mm with fully customizable lengths, ensuring you get exactly what your project requires. Backed by ISO9001 certification and a team of 51–100 skilled professionals, we deliver consistent quality and reliable supply.
Product Features and Technical Specifications
Superior Material Grades: Available in Q235B (general structural steel) and Q345B (higher strength steel), our round bars offer excellent weldability, machinability, and ductility for diverse applications.
Wide Diameter Range: From 10mm to 300mm, we stock all common sizes and can produce custom diameters upon request with minimal lead time.
Customizable Lengths: Lengths can be tailored to your exact specifications – from 3 meters to 12 meters or longer, with precise cutting tolerance.
Consistent Mechanical Properties: Each batch is tested for yield strength, tensile strength, and elongation to ensure compliance with national standards.
Surface Options: Choose from black (natural), bright (turned), pickled, or oiled surface finishes to suit your further processing or end-use.
Stringent Quality Control: Our ISO9001-certified facility conducts dimensional checks, chemical composition analysis, and mechanical property tests on every production lot.
| Parameter | Q235B | Q345B |
|---|---|---|
| Yield Strength (MPa) | ≥ 235 | ≥ 345 |
| Tensile Strength (MPa) | 370–500 | 470–630 |
| Elongation (%) | ≥ 26 | ≥ 22 |
| Carbon Content (max %) | 0.22 | 0.20 |
| Diameter Tolerance | ±0.5mm (10–50mm) / ±1.0mm (51–300mm) | Same as Q235B |
| Standard | GB/T 700-2006 | GB/T 1591-2018 |
Key Benefits for Your Business: Our hot rolled round bars are designed to reduce your downstream processing costs. The uniform internal structure ensures minimal distortion during cutting, welding, and machining. The customizable length option eliminates waste and saves on shipping costs. Moreover, the availability of both Q235B and Q345B grades allows you to select the optimal balance between cost and strength for your specific application – whether it's structural columns, shafts, bolts, or reinforcement components.
Trusted by Global Markets
Since our establishment in 2025, Hemaokang Steel has rapidly expanded its reach to North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, East Asia, Western Europe, Central America, Northern Europe, Southern Europe, South Asia, and the domestic Chinese market. With an annual export value between US$50 million and US$100 million, we have proven our ability to handle large-volume orders with consistent quality. Our ISO9001 certification guarantees that every shipment meets or exceeds international standards. We invite you to experience the difference of working with a supplier that prioritizes precision, reliability, and customer satisfaction. Contact us today for a quote or to discuss your custom requirements.
Frequently Asked Questions (FAQ)
Q: What is the difference between Q235B and Q345B round bars?
A: Q235B is a general-purpose structural steel with lower strength (yield ≥235 MPa) and excellent weldability, suitable for lighter structures. Q345B offers higher strength (yield ≥345 MPa) with good toughness, ideal for heavy-duty applications like bridges and high-rise buildings.Q: Can you provide customized lengths beyond standard 6m or 12m?
A: Yes, we offer fully customizable lengths. You can specify any length between 1m and 18m, or even longer for large-diameter bars. We cut to your exact requirement with a tolerance of ±5mm.Q: What surface finishes are available?
A: We supply black (as-rolled), bright (turned), pickled, and oiled surfaces. The surface can also be customized upon request, such as shot-blasted or coated for special corrosion resistance.Q: Do you provide third-party inspection certificates?
A: Absolutely. We can arrange inspection by SGS, BV, or other independent agencies at your cost. Our own mill test certificates are issued with each shipment, confirming chemical and mechanical properties.Q: What is the typical lead time for an order?
A: For standard diameters and lengths, lead time is 15–20 days after receipt of deposit. Custom sizes may require 25–30 days. We also offer rush orders subject to stock availability.Q: How are the round bars packaged for export?
A: They are bundled with steel straps, wrapped in waterproof material, and secured on wooden pallets or steel frames. Seaworthy packaging is provided for ocean freight, ensuring protection during transit.Q: What is the minimum order quantity (MOQ)?
A: For common diameters (10–100mm), MOQ is 5 tons. For larger diameters (101–300mm), MOQ is 10 tons. We can discuss smaller quantities for trial orders – please contact our sales team.Q: Can you supply round bars with special tolerances?
A: Yes, we can produce to tighter tolerances (e.g., h9, h11) upon request. Additional processing like peeling or grinding may be required, which will affect pricing and lead time.
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