Description
Factory-Direct Hot Rolled Coil Supply — Shandong Xin Jiyuan operates its own steel mill with three production lines, delivering Q235 Q345 hot rolled steel coil directly from slab to finished product without third-party sourcing gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345 Hot Rolled Steel Coil |
| Product Type | Steel Coil |
| Steel Grade | Q195, Q235, Q235B, Q345, Q345B, A36, SS400, St37, St37-2, St35, St35-4, St42, St52-4 |
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Section Shape | Coil |
| Size Range | Thickness 0.75–200mm, Width 600–2000mm |
| Coil ID | 508/610mm |
| Length | Customized |
| Technique | Hot Rolled |
| Surface Treatment | Coated / Oiled |
| Tolerance | ±1% |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Application | Construction, Shipbuilding, Machinery, Automotive, Bridges, Pressure Vessels |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Structural frames, bridge girders, building panels, column bases |
| Industrial Fabrication | Pressure vessels, machinery frames, crane booms, conveyor structures |
| Shipbuilding | Hull plates, deck structures, bulkhead panels |
| EPC Projects | Warehouse frames, logistics center structures, plant support systems |
Material Traceability Gaps Cost More Than Price Differences on Coil Orders
Third-party sourcing creates certification blind spots that surface at customs or site inspection.
When buyers procure Q235 Q345 hot rolled steel coil from trading companies who source from multiple mills, the material certification chain breaks. Heat numbers on mill test certificates no longer match the physical coils delivered. European project inspectors reject shipments lacking EN 10204 3.1 documentation traceable to specific heat lots. [NEED_CITE: EN 10204 inspection document types for steel products] The cost of air-freighting replacement material or delaying project handover dwarfs any initial price savings from fragmented sourcing. Our vertically integrated production eliminates this risk — every coil traces directly from our slab casting to finished product under one quality system.
Matching Coil Specifications to Structural Load Requirements
Hot rolled coil in Q235 and Q345 grades serves distinct structural roles based on yield strength hierarchy. Q235 provides adequate strength for secondary structures and non-load-bearing frames, while Q345 delivers higher yield for primary load-bearing members in bridges and industrial buildings. The 0.75–200mm thickness range covers everything from light-gauge forming applications to heavy structural plate. Width options from 600–2000mm allow optimization for specific cutting layouts, reducing material waste on project-specific fabrication. [NEED_CITE: structural steel grade selection for load-bearing applications]
Engineering Compliance and Certification Pathways
International projects demand documentation that proves conformity to recognized standards. Our Q235 Q345 hot rolled steel coil production meets GB standards for domestic specifications, while A36 and SS400 grades serve North American and Japanese project requirements respectively. European projects specifying S235/S275/S355 equivalents require chemical composition and mechanical property verification per EN standards. Third-party inspection through SGS, BV, or TÜV validates compliance at any production stage. The ±1% thickness tolerance ensures dimensional accuracy for precision fabrication work, while coated or oiled surface treatment protects against transit corrosion without affecting weldability.
Understanding Hot Rolled Coil Production and Grade Selection
Hot rolling produces steel coil by passing slabs through rolling mills at temperatures above recrystallization point, resulting in mill scale surface finish and improved formability compared to cold rolled alternatives. The Q-series grades (Q195 through Q345) follow Chinese GB standards where the number indicates minimum yield strength in MPa. A36 represents the American ASTM equivalent for general structural applications, while SS400 serves Japanese JIS specifications. European designations like St37 and St52-4 indicate tensile strength ranges in older DIN standards. Thickness tolerance of ±1% applies across the full 0.75–200mm range, though tighter tolerances may apply for specific gauge ranges. Surface treatment options include oiled finish for short-term corrosion protection during storage and transit, or coated variants for enhanced durability in corrosive environments.
Hidden Costs of Incorrect Grade Selection and Certification Failures
Specifying Q235 when project engineering requires Q345 creates structural safety risks that surface during load testing or inspection. Conversely, over-specifying higher grades increases material costs without engineering justification. Missing or incomplete mill test certificates trigger customs holds on international shipments, particularly for EU projects requiring CE marking documentation. [NEED_CITE: CE marking requirements for structural steel components] Negative tolerance beyond acceptable ranges reduces actual section properties, compromising structural calculations. Our integrated quality system provides complete traceability from heat number through final inspection, preventing these costly failures.
Why Procurement Teams Choose Vertically Integrated Coil Supply
Our own steel mill with three production lines means direct control over slab quality, rolling parameters, and final inspection criteria. The 2,800+ specification range covers virtually any structural steel requirement without sourcing from third parties. Every Q235 Q345 hot rolled steel coil undergoes in-house gauge and surface inspection before release. Our engineering team reviews shop drawings and provides material optimization recommendations before production begins. Complete quality documentation packages include WPS, PQR, dimensional inspection reports, and coating certificates. International project experience acro*familiarity with regional compliance requirements and documentation standards.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB standards, with EN 10204 3.1 format available for European projects
- Third-party inspection reports from SGS, BV, or TÜV verifying dimensional accuracy and surface quality at any production stage
- ISO 9001 certified quality management system with complete heat number traceability from slab to finished coil
- Material traceability documentation linking each coil to specific heat lots with full chemical and mechanical test results
- Customs documentation including packing list, bill of lading, and certificate of origin formatted for destination country requirements
- Coating inspection reports for oiled or coated surface treatment verification per project specifications
Packaging, Loading & Delivery
- Hot rolled coils secured with steel strapping and edge protectors to prevent edge damage during ocean transit, with oiled surface treatment providing corrosion protection
- Coil ID options of 508mm or 610mm accommodate different uncoiling equipment specifications at fabrication facilities
- Width optimization from 600–2000mm allows efficient container loading, with 20-ton payloads standard for 20-foot containers
- Custom length cutting and decoiling services available before shipment, reducing secondary processing at project sites
- Heat number and grade identification marked on each coil inner diameter for site traceability verification
- FOB, CIF, and DDP shipping terms available with professional oversized cargo loading expertise for heavy coil shipments
Initiating Your Coil Procurement Process
Submit project drawings, specifications, steel grade requirements, and destination port to receive preliminary assessment within 24 hours. Our engineering team reviews material requirements and provides shop drawing recommendations before production begins. Complete mill test certificates and third-party inspection arrangements confirmed before contract signing.
Start Your Q235 Q345 Hot Rolled Steel Coil Inquiry
Share your project specifications, required grades, and delivery destination to receive detailed quotation with complete documentation package.
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
Frequently Asked Questions
Q: What is the difference between Q235, Q345, and A36 grades for structural applications?
A: Q235 and Q345 follow Chinese GB standards where the number indicates minimum yield strength in MPa. Q235 suits secondary structures and non-load-bearing applications, while Q345 provides higher strength for primary structural members. A36 represents the American ASTM equivalent for general structural use, with similar mechanical properties to Q235.
Q: Can you provide mill test certificates for European project compliance?
A: Yes, we provide mill test certificates in EN 10204 3.1 format documenting chemical composition and mechanical properties for each heat lot. Third-party inspection through SGS, BV, or TÜV is available at any production stage for additional verification required by European projects.
Q: Do you offer cutting and processing services before shipment?
A: Yes, our in-house processing capabilities include CNC cutting, plasma cutting, bending, punching, and decoiling. Custom sheet sizes can be produced from coil before shipment, eliminating secondary processing requirements at your fabrication facility.
Q: How do you ensure thickness tolerance across the full 0.75–200mm range?
A: Our ±1% thickness tolerance applies across the complete specification range. In-house gauge inspection verifies dimensional accuracy before coil release. Our own steel mill production with three rolling lines ensures consistent quality control from slab to finished product.
Q: What surface treatment options are available for corrosion protection?
A: We offer oiled surface treatment for short-term corrosion protection during storage and transit, suitable for indoor applications or immediate fabrication. Coated variants provide enhanced durability for outdoor exposure or corrosive environments. Surface treatment selection depends on your project’s storage conditions and fabrication timeline.
