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Help CenterQ235B 3-12mm Thickness 1250-2000mm Width Carbon Steel Coil for Mechanical Parts
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Hemaokang Steel (Shandong) Co., Ltd., established in 2025 with an annual export value of US$50 Million – US$100 Million, is a reliable supplier of high-quality carbon steel coils. Our Q235B carbon steel coil in 3–12mm thickness and 1250–2000mm width is specifically designed for manufacturing mechanical parts, offering excellent weldability, formability, and cost efficiency. Backed by ISO9001 certification and a team of 51–100 experienced professionals, we ensure consistent quality and timely delivery to markets worldwide including North America, South America, Europe, Asia, and Africa.
Key Features & Technical Specifications
Our Q235B carbon steel coil is produced under strict quality control to meet the demanding requirements of mechanical part manufacturing. Below are the core characteristics:
- Material Grade: Q235B per GB/T 700 – equivalent to ASTM A36 / S235JR, offering good tensile strength and elongation.
- Thickness Range: 3 mm to 12 mm, with tolerance as per GB/T 709 (Class A or B available upon request).
- Width Range: 1250 mm to 2000 mm, with slit edges or mill edges optional.
- Surface Finish: Standard black (as rolled) or pickled & oiled for better corrosion resistance.
- Mechanical Properties: Yield strength ≥ 235 MPa, tensile strength 370–500 MPa, elongation ≥ 26% (for thickness ≤ 16mm).
- Weldability & Formability: Excellent for stamping, bending, and welding – ideal for brackets, gears, shafts, and housings.
- Coil Weight: Customizable from 3 tons to 15 tons per coil, with inner diameter 508 mm or 610 mm.
- Packaging: Standard sea-worthy packaging with inner waterproof paper, steel skids, and outer steel strips or wooden cases.
| Parameter | Specification |
|---|---|
| Thickness (mm) | 3.0 – 12.0 |
| Width (mm) | 1250 – 2000 |
| Standard | GB/T 700 (Q235B) |
| Yield Strength (MPa) | ≥ 235 |
| Tensile Strength (MPa) | 370 – 500 |
| Elongation (%) | ≥ 26 |
| Surface | Black (as rolled) / Pickled & Oiled |
| Coil Inner Diameter | 508mm / 610mm (optional) |
Advantages for Mechanical Parts Manufacturing
This Q235B coil is a preferred choice for mechanical parts due to its balanced strength and ductility. Key benefits include:
- Cost-effective: Lower alloy content reduces material cost without sacrificing performance for non-critical structural parts.
- Easy processing: Can be cut, welded, stamped, and bent using standard equipment – reduces tooling wear.
- Consistent quality: Our ISO9001 quality management system ensures tight dimensional tolerances and uniform mechanical properties across coils.
- Versatile applications: Suitable for brackets, frames, gears, shafts, and other mechanical components in automotive, agricultural machinery, construction equipment, and general industry.
- Customizable sizes: We offer slitting, cutting-to-length, and edge trimming services to meet your exact specifications.
Why Choose Hemaokang Steel?
As a newly established but rapidly growing steel exporter, we combine modern production facilities with a dedicated team of 51–100 employees. Our ISO9001-certified factory ensures every coil is tested and inspected before shipment. With an annual export value exceeding US$50 Million, we have built a strong supply chain covering more than 15 markets across North America, South America, Europe, Africa, Asia, and Oceania. Our commitment to on-time delivery, competitive pricing, and after-sales support makes us a trusted partner for mechanical parts manufacturers worldwide.
We welcome inquiries for custom thicknesses, widths, and special packaging. Our team is ready to provide mill test certificates, technical datasheets, and free samples upon request. Contact us today to discuss your requirements and experience the Hemaokang difference.
Frequently Asked Questions (FAQ)
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Q: What is the equivalent grade of Q235B in international standards?
A: Q235B roughly corresponds to ASTM A36 (USA) and S235JR (EN 10025). However, please check your local standard for exact equivalence. -
Q: Can you supply coils with a thickness of 3mm exactly?
A: Yes, we can produce any thickness within the 3–12mm range. Tolerances follow GB/T 709, and tighter tolerances are available upon request for an additional cost. -
Q: What is the typical coil weight for 1250mm width?
A: Typical coil weight ranges from 5 to 10 tons, but we can customize from 3 tons up to 15 tons per coil depending on the thickness and width. -
Q: Do you offer cutting-to-length or slitting services?
A: Yes, we can slit coils to narrower widths (e.g., 200mm–1249mm) and cut to fixed lengths. Please specify your requirements when ordering. -
Q: What is the lead time for this product?
A: For standard sizes, lead time is approximately 15–20 days after order confirmation. Custom sizes may take 20–30 days. We provide expedited shipping options for urgent orders. -
Q: Is the coil suitable for welding without preheating?
A: For thicknesses under 20mm, Q235B generally does not require preheating. For thicker sections (above 12mm), we recommend a preheat of 100–150°C to avoid cracking. Always follow appropriate welding procedures. -
Q: How do you ensure the quality of the coils?
A: Our factory is ISO9001 certified. Each coil undergoes chemical composition analysis, mechanical testing, and dimensional inspection. Mill test certificates are provided with each shipment. -
Q: What packaging do you use for export?
A: Standard packaging includes inner waterproof paper, steel skids (or wooden pallets), and steel strapping. For long-distance sea freight, we can add extra protection such as wooden crates or VCI paper at your request.
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