Description
Direct Mill Supply, No Middlemen — Q235 and Q345 hot rolled carbon steel plates produced in our own facility, shipped with full heat-number traceability from slab to cut piece.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345 Hot Rolled Carbon Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | Q235, Q345, AISI Mild Steel |
| Standard | JIS, DIN, AISI |
| Thickness Range | 1mm–20mm |
| Technique | Hot Rolled |
| Surface Treatment | Hot Rolled Finish |
| Processing Services | Cutting, Bending, Welding |
| Application | Ship Building, Construction, Structural Fabrication |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Shipbuilding | Hull plating, deck stiffeners, bulkhead frames |
| Construction | Column base plates, beam splice connections, mezzanine flooring |
| Infrastructure | Bridge gusset plates, equipment support platforms |
| Industrial Fabrication | Conveyor frames, crane runways, storage rack uprights |
Material Traceability Gaps Cost More Than the Plate Itself
One unverified heat number can shut down an entire fabrication lot.
Overseas buyers sourcing Q235 Q345 hot rolled carbon steel plate cutting bending welding service from disconnected suppliers face a recurring problem: the mill test certificate arrives, but the chemistry does not match what the third-party inspector finds at the destination port. Carbon content drifts, manganese falls below grade minimums, and an entire container sits in customs while project timelines burn through penalty clauses. [NEED_CITE: material traceability requirements in EN 1090 structural fabrication] When the material source and the fabrication workshop are separate entities, accountability fractures — the mill blames the trader, the trader blames the processor, and the buyer holds the invoice.
How Hot Rolled Plates Match Structural Fabrication Demands
Q235 and Q345 hot rolled plates in the 1mm to 20mm range cover the thickness band most structural fabricators need for connection nodes, base plates, and gussets. The hot rolled finish provides a uniform oxide layer that accepts shop primer without aggressive surface prep, and the internal grain structure from controlled rolling supports consistent weld penetration — critical when your Q235 Q345 hot rolled carbon steel plate cutting bending welding service order includes full-penetration groove welds on primary members. Our in-house CNC plasma cutting holds dimensional tolerance tight enough that fabricated pieces arrive on site ready to bolt, eliminating the field-cutting delays that plague projects where plates are sourced separately from fabrication.
Engineering Compliance Across International Standards
Structural projects in the EU require EN 1090 execution class documentation, while Middle East and Southeast Asian infrastructure specs often reference AISC or BS equivalents. Q235 roughly maps to S235JR in the EN system and A36 in ASTM; Q345 corresponds to S355JR and A572 Grade 50 — but equivalence on paper does not satisfy customs inspectors or client QA auditors without proper certification chains. [NEED_CITE: steel grade equivalence between Chinese GB and European EN standards] Each plate we ship carries a mill test certificate tied to the original heat number from our own steel production lines, and our welding procedures are qualified to both AWS D1.1 and EN ISO 15614 so that fabricated assemblies clear inspection regardless of destination market.
Understanding Q235 vs Q345 for Load-Bearing Applications
The Q-series designation follows the Chinese GB/T 700 and GB/T 1591 standards, where the number indicates minimum yield strength in MPa. Q235 serves general structural purposes where moderate strength suffices — secondary frames, walkways, non-load-bearing enclosures. Q345 delivers higher yield strength for primary structural members, crane beams, and heavy equipment supports where deflection limits tighten. The hot rolling process produces a ferrite-pearlite microstructure that balances formability with strength, and the 1mm to 20mm thickness range covers everything from light gauge bracing plates to medium-weight column base plates. Surface condition from hot rolling — mill scale intact — provides short-term corrosion resistance during storage and transit, though long-term exposure demands blast cleaning and coating per project specification.
The Hidden Price of Unverified Steel Plates
Fabricators who accept Q235 Q345 hot rolled carbon steel plate cutting bending welding service quotes based on price alone often discover the real cost during welding. A plate labeled Q345 that actually delivers Q235 chemistry will crack under the thermal stress of multi-pass SAW welding; a heat number that traces back to a scrap remelt rather than primary steel production fails ultrasonic testing on critical joints. [NEED_CITE: consequences of material substitution in structural steel fabrication] The rework — cutting out failed welds, sourcing replacement plates, rescheduling cranes and crews — typically exceeds the original material savings by multiples, and that assumes the defect surfaces before erection.
Why Project Teams Source Fabricated Plates From Our Facility
Our own steel production facility with three rolling lines means every plate we cut, bend, or weld starts as slab we melted and rolled — no trading company inserts a layer of uncertainty between your specification and the chemistry report. When your Q235 Q345 hot rolled carbon steel plate cutting bending welding service order arrives, the mill test certificate references our heat numbers, our rolling records, and our in-house laboratory results. The fabrication workshop sits adjacent to the mill, so plates move from storage to CNC cutting without leaving the site, eliminating transport damage and mix-up risks. We maintain over 2,800 specifications in raw material inventory, so standard thicknesses ship from stock while custom-cut pieces follow approved shop drawings through our welding bay, where every procedure is qualified and every welder holds current certification to AWS or EN standards.
Documentation & Compliance
- Mill test certificate documenting Q235 and Q345 chemical composition and mechanical properties per GB/T 700 and GB/T 1591, tied to original heat number
- EN 1090 factory production control certificate for structural steel fabrication execution
- ISO 9001 quality management system certificate covering steel production and fabrication processes
- SGS or BV third-party inspection report available for pre-shipment verification of dimensions, coating thickness, and material chemistry
- Welding procedure specifications (WPS) and procedure qualification records (PQR) per AWS D1.1 or EN ISO 15614 for all welded assemblies
- Export documentation including packing list, bill of lading, certificate of origin, and fumigation certificate for wooden packaging
Packaging, Loading & Delivery
- Hot rolled Q235 and Q345 plates bundled with steel straps and edge protectors to prevent surface scratching during ocean transit
- Cut-to-size fabricated plates wrapped in waterproof paper and plastic film, separated by timber dunnage to avoid contact damage
- Container loading optimized for 1mm to 20mm thickness combinations, with heavier gauge plates positioned at the bottom to distribute weight evenly
- Heat number and steel grade stenciled on each plate edge for site identification and traceability verification
- FOB, CIF, and DDP terms available with professional stowage planning for oversized fabricated components exceeding standard container dimensions
Start Your Fabrication Inquiry With Drawings and Specifications
Submit your project drawings in PDF or DWG format along with steel grade requirements, thickness specifications, and applicable standards, and our engineering team responds within one day with a preliminary assessment covering material, fabrication, coating, and logistics costs. We prepare shop drawings for your approval before production begins, ensuring every cut, bend, and weld matches your design intent — then we ship with complete documentation so your Q235 Q345 hot rolled carbon steel plate cutting bending welding service order clears customs and reaches site on schedule.
Frequently Asked Questions
Q: What is the difference between Q235 and Q345 steel plates for structural applications?
A: Q235 provides moderate yield strength suitable for secondary structures, walkways, and enclosures, while Q345 delivers higher yield strength for primary load-bearing members, crane beams, and heavy supports. Both grades are available in hot rolled finish from 1mm to 20mm thickness with full mill test certification.
Q: Can you provide cutting, bending, and welding services to custom drawings?
A: Yes, our in-house fabrication workshop handles CNC plasma and flame cutting, plate bending, and MIG/MAG/SAW welding per approved shop drawings. We prepare detailed shop drawings for your review and approval before production begins.
Q: What quality documentation is included with each shipment?
A: Each shipment includes mill test certificates with chemical composition and mechanical properties tied to original heat numbers, welding procedure specifications, procedure qualification records, dimensional inspection reports, and coating thickness measurements. Third-party inspection reports from SGS or BV are available upon request.
Q: What is the typical lead time for custom-fabricated steel plates?
A: Standard thickness plates ship from stock inventory, while custom-cut and welded assemblies follow typical production lead times after shop drawing approval. Exact schedules depend on order complexity and current workshop capacity.
Q: Do you handle export packing and oversized cargo loading for international delivery?
A: Yes, we provide professional packing with waterproof protection and timber dunnage, plus specialized loading plans for oversized fabricated components. We coordinate container stowage and can arrange door-to-door logistics to major ports worldwide.
Get Your Q235 Q345 Hot Rolled Carbon Steel Plate Quote Today
Send your project drawings, steel grade requirements, and target specifications to receive a detailed quotation with mill test certificate documentation and fabrication timeline.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.xjystructure.com
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
