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Help CenterQ235 Ss400 Carbon Steel Rod 20mm-500mm Diameter Hot Rolled Mild Steel Bar for Structural Use
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Welcome to Hemaokang Steel (Shandong) Co., Ltd., a professional steel manufacturer and exporter based in Liaocheng, Shandong, China. Our Q235 and SS400 hot rolled carbon steel rods, available in diameters from 20mm to 500mm, provide reliable performance for various structural applications. With an annual export value of US$50 million to US$100 million and a dedicated team of 51-100 employees, we are well-positioned to supply high-quality steel bars to global buyers.
These mild steel bars are produced through the hot rolling process, which gives them uniform mechanical properties and a consistent internal structure. The material grades Q235 and SS400 are widely recognized for their balanced yield strength, good ductility, and excellent weldability. Whether your project involves building frames, bridge elements, mechanical parts, or general steel structures, these carbon steel rods offer a practical and cost-effective solution.
Product Features
- Wide diameter range: 20mm to 500mm covers various load-bearing needs.
- Hot rolled surface ensures a dimensionally stable bar.
- Excellent weldability for fabrication and structural assembly.
- Customizable lengths: standard 6m/12m or cut to your specifications.
- Consistent quality: manufactured under ISO9001 quality management system.
Technical Specifications
| Specification | Value |
|---|---|
| Material Grade | Q235 (A/B), SS400 |
| Diameter Range | 20mm - 500mm |
| Manufacturing Process | Hot rolling |
| Standard Compliance | GB/T700, JIS G3101 |
| Length | 6m, 12m, or customized |
| Tensile Strength | 370-500 MPa (typical, size dependent) |
| Yield Strength | Q235: ≥235 MPa, SS400: ≥245 MPa |
| Surface Condition | Black (mill scale), bright, oiled, pickled, or rust-proof coating (optional) |
Q235 and SS400 are both structural carbon steels with similar yield strengths. Q235 follows the Chinese standard GB/T700, while SS400 follows Japanese standard JIS G3101. The tensile strength typically ranges from 370 MPa to 500 MPa, depending on thickness and diameter. For Q235, the minimum yield strength is 235 MPa; for SS400, it is 245 MPa. These values make the rods suitable for constructing frames, columns, beams, and other load-bearing components.
Hot Rolling Process Advantages
The hot rolling process starts with reheating steel billets above the recrystallization temperature, then passing them through rolling mills to achieve the desired diameter. This process improves the microstructure, reduces internal stress, and ensures uniform hardness across the bar. The result is a strong, tough rod that is easy to machine, drill, cut, and weld.
Advantages for Buyers
- Reliable structural strength with controlled material composition.
- Good ductility and toughness, allowing bending and forming without cracking.
- Cost-effective carbon steel grade for high-volume construction and fabrication.
- Wide diameter range reduces the need for multiple suppliers.
- Optional surface treatments and custom lengths offer production flexibility.
Common Applications
These carbon steel rods serve as essential raw materials in many industries. Common applications include:
- Building and construction: columns, beams, roof trusses, and foundation hardware.
- Bridge and infrastructure: structural supports, braces, and connectors.
- Mechanical engineering: shafts, studs, pins, and general machining stock.
- Shipbuilding and offshore: small marine components and structural reinforcements.
- Energy and transportation: equipment frames, rail fittings, and structural steel for power plants.
Quality and Custom Options
At Hemaokang Steel, quality assurance starts from raw material inspection to final packaging. Our production line follows strict internal process controls, and we can supply mill test certificates, tensile tests, and chemical composition reports upon request. Surface treatments such as black (mill scale), bright, oiled, pickled, or rust-proof coating are available as optional services. Length can be fixed at 6 meters, 12 meters, or customized according to your drawings.
Export Strength and Global Reach
With headquarters and production facilities in Shandong, our export business covers North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, Eastern Asia, Western Europe, Central America, Northern Europe, and Southern Europe. We have shipped US$50 million worth of steel products in the past year, serving clients across different industries. Our dedicated international sales team offers fast responses, professional documentation, and flexible logistics arrangements from Qingdao port.
Contact Hemaokang Steel today for quotations, stock availability, and technical advice. Let us be your reliable partner for carbon steel rod supply.
Frequently Asked Questions
Q1: What is the difference between Q235 and SS400?
A1: Q235 is based on Chinese standard GB/T700 and SS400 on Japanese JIS G3101. Both have similar mechanical properties; Q235 minimum yield strength is 235 MPa, SS400 is 245 MPa. The chemical composition and impact requirements may differ slightly. We can supply either grade according to your project specification.
Q2: Can I order diameters outside the 20-500mm range?
A2: Our standard diameter range is 20-500mm. Other sizes may be available upon request. Please contact our sales team with your specific dimension requirements.
Q3: Do you provide custom lengths?
A3: Yes. Standard lengths are 6m and 12m, but we can customize lengths based on your project needs, such as 8m, 10m, or any specified cutting length.
Q4: What surface treatment options do you offer?
A4: The hot rolled bars usually come with a mill scale surface. We can also provide pickled (bright) surface, oiled surface, or rust preventive coating as optional treatments. Let us know your preference.
Q5: Can you provide test certificates and material certifications?
A5: Yes. We can provide mill test certificates, chemical analysis reports, and tensile test reports. Our products comply with ISO9001 quality management system requirements. Test documentation is available for each batch.
Q6: What is the minimum order quantity (MOQ)?
A6: Our MOQ is flexible and depends on the diameter and specification. For standard sizes, a small trial order is accepted. Contact us for specific MOQ details.
Q7: What is the packing and delivery?
A7: Bars can be bundled with steel strips, packed in loose bundles, or loaded as per shipping requirements. We ship from Qingdao port by container or bulk vessel, depending on the quantity and size.
Q8: How is quality ensured before shipping?
A8: We perform internal inspection on dimensions, surface quality, and mechanical properties. Third-party inspection can be arranged if requested by the buyer.
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