Description
Factory Direct Supply — Vertically integrated steel mill and fabrication facility producing Q235B hot rolled steel coils with full material traceability from continuous casting slab to finished product.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B Hot Rolled Steel Coil |
| Product Type | Steel Coil |
| Steel Grade | Q195, Q235, Q235B, Q345, Q345B, A36, SS400, St37, St37-2, St52, St35 |
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Thickness | 0.75–200 mm |
| Width | 600–2000 mm |
| Length | Customized |
| Coil ID | 508 / 610 mm |
| Technique | Hot Rolled |
| Surface Treatment | Hot Rolled / Coated |
| Tolerance | ±1% |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Construction, Shipbuilding, Automotive, Bridges, Machinery, Pressure Vessels, Industrial Fabrication |
| MOQ | 1 Ton |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural frames, bridge components, building panels, platform decks |
| Industrial Fabrication | Pressure vessels, machinery bases, conveyor structures, storage tanks |
| Shipbuilding & Heavy Equipment | Hull sections, cargo containers, crane booms, offshore platform components |
What Thickness Tolerance Costs on a Structural Frame Order
±1% thickness precision eliminates on-site rework and structural miscalculation.
When sourcing Q235B hot rolled steel coils from fragmented suppliers, buyers face material certification gaps and inconsistent quality. A coil that arrives with actual thickness deviating beyond tolerance forces contractors to either reject the shipment or absorb costly delays while sourcing replacement material. The integration of raw material production and fabrication under one roof eliminates this gap — material traceability from slab to coil ensures every heat number matches the mill test certificate. [NEED_CITE: material traceability requirements in EN 1090 structural steel fabrication]
Precision Matching for Heavy-Duty Structural Applications
Q235B hot rolled steel coils in thickness range 0.75–200mm serve projects where load-bearing capacity and dimensional accuracy determine structural integrity. The hot rolled surface provides excellent weldability for connection assemblies, while optional coating extends service life in corrosive environments. Our engineering team reviews shop drawings before fabrication begins, ensuring coil dimensions align with CNC cutting programs and welding sequences.
Engineering Compliance and Certification Framework
Structural steel fabrication for international projects requires compliance with EN 1090, AWS D1.1, or AISC standards depending on destination market. Q235B meets GB/T 700 requirements and finds equivalence with A36 in ASTM systems for general structural applications. Third-party inspection from SGS, BV, or TÜV verifies chemical composition and mechanical properties before shipment. Custom width and thickness coils undergo dimensional inspection with full documentation package including weld maps and coating reports. [NEED_CITE: EN 1090 execution class requirements for structural steel components]
Steel Grade Selection and Hot Rolling Process
Q235B belongs to the Chinese GB standard system, offering yield strength suitable for general construction and industrial fabrication. The hot rolling process produces coils with uniform grain structure and improved formability compared to cold rolled alternatives. Thickness range from 0.75mm to 200mm covers applications from light gauge panels to heavy structural plates. Width options from 600mm to 2000mm accommodate various cutting patterns and minimize material waste. Processing services including welding, punching, cutting, and bending reduce on-site fabrication time and labor costs.
Hidden Costs of Incorrect Material Procurement
Procuring Q235B hot rolled steel coils without verified mill test certificates creates risk of material substitution and certification failure at customs. Coils sourced from third-party traders without direct mill access often lack complete chemical composition data per heat number. Negative tolerance beyond acceptable limits reduces actual load-bearing capacity while maintaining theoretical weight billing. Engineering projects requiring EN 1090 or AISC compliance cannot proceed without complete quality documentation tracing material from continuous casting to finished coil. [NEED_CITE: structural steel material certification requirements for EU market entry]
Integrated Supply Chain Advantages
Our vertically integrated facility combines steel production with structural fabrication, eliminating the gap between material supplier and processor. The own steel mill operates three production lines with over 2,800 specifications of raw material available. Certified welding procedures and qualified welders hold AWS and EN certifications for international project compliance. Complete quality documentation includes WPS, PQR, weld maps, dimensional inspection reports, and coating reports. Professional engineering support covers shop drawing review, material optimization, and fabrication sequencing to prevent costly rework.
Documentation & Compliance
- Mill test certificate documenting Q235B chemical composition and mechanical properties per heat number
- CE certificate confirming compliance with EN 1090 execution class requirements
- ISO 9001 quality management system certification for production processes
- SGS or BV third-party inspection report available before shipment
- Material traceability from continuous casting slab to finished coil by heat number
- Customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Q235B hot rolled steel coils packed with eye-to-sky or eye-to-wall orientation based on customer preference
- Inner protection with waterproof paper and plastic film prevents surface damage during ocean transit
- Outer wrapping with steel strips secures coil integrity for containers and bulk vessel loading
- Coil ID 508mm and 610mm options accommodate different decoiling equipment specifications
- Heat number and steel grade markings clearly visible on coil outer surface for site identification
- FOB, CIF, and DDP shipping terms available with professional oversized cargo loading planning
Streamlined Procurement for Project Buyers
Submit project drawings in PDF or DWG format along with steel grade requirements, thickness specifications, and quantity to receive preliminary assessment within 24 hours. Detailed quotation includes material cost, processing services, coating options, packing, and shipping to destination port. Shop drawing approval process ensures dimensional accuracy before production begins, with typical lead times confirmed upon order placement.
Frequently Asked Questions
Q: What is the difference between Q235B and A36 steel grades?
A: Q235B follows Chinese GB/T 700 standard while A36 conforms to ASTM A36/A36M. Both serve general structural applications with similar yield strength characteristics, though chemical composition limits differ slightly.
Q: Can you provide EN or ASTM equivalent grades for Q235B?
A: Q235B finds practical equivalence with A36 in ASTM system and S235JR in EN system for general structural applications. Complete chemical composition comparison available in mill test certificate.
Q: What is the lead time for custom width and thickness coils?
A: Standard specifications maintain ready stock for immediate dispatch. Custom width and thickness orders require typical production lead times confirmed upon drawing approval and deposit receipt.
Q: Do you offer theoretical weight or actual weight billing?
A: Both theoretical weight and actual weight billing options available based on customer preference. Weight calculation method confirmed in quotation before contract signing.
Q: What packaging standards do you use for seaworthy export?
A: Q235B hot rolled steel coils receive inner waterproof protection with paper and plastic film, outer steel strip binding, and optional wooden pallet support for container loading.
Request Your Q235B Hot Rolled Steel Coil Quotation
Send specifications including thickness, width, quantity, and destination port to receive detailed pricing with mill test certificate within 24 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
