Description
Factory-direct pricing, zero middlemen — every Q235 Q345 hot rolled carbon steel plate 1-20mm JIS DIN Factory Direct Supplier rolls off our own production lines with original mill test certificates attached.
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 |
| Thickness Range | 1mm–20mm |
| Technique | Hot Rolled |
| Surface Treatment | Hot Rolled Finish |
| Processing Service | Cutting, Bending, Welding |
| Application | Ship Building, Construction, Structural Fabrication |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Shipbuilding | Hull structural plates, deck flooring, bulkhead framing |
| Construction & Infrastructure | Building column base plates, platform grating supports, bridge gusset plates |
| Structural Fabrication | Machinery base frames, welded beam-to-column connections, equipment skids |
Why Chemical Composition Traceability Decides Whether Your Plates Pass Site Inspection
A mill test certificate that doesn’t match the actual chemistry is the single most expensive piece of paper on a construction site.
I’ve watched an entire container of Q345 plates get rejected at a Riyadh project gate because the carbon equivalent on the real material didn’t match what the cert claimed — welds cracked during fit-up, and the re-melting cost dwarfed the original plate price. When sourcing a Q235 Q345 hot rolled carbon steel plate 1-20mm JIS DIN Factory Direct Supplier, buyers frequently discover that certificates from trading companies are re-issued copies with no heat-number linkage to the actual batch [NEED_CITE: material traceability requirements in EN 10204 Type 3.1 inspection documents]. Fragmented sourcing across multiple yards means mixed heat numbers in a single order, making third-party SGS/BV verification impossible to reconcile against original mill records.
How Hot Rolled Finish Matches Structural Welding and Forming Demands
Hot rolled plates in Q235 and Q345 grades carry a mill scale surface that accepts primer coatings directly after blast cleaning, eliminating the extra passivation step required for oiled or pickled finishes. The 1mm–20mm thickness window covers everything from light gauge bracing gussets to heavy column base plates, and the hot rolled process ensures uniform grain structure that holds dimensional stability during flame cutting and bending. As a Q235 Q345 hot rolled carbon steel plate 1-20mm JIS DIN Factory Direct Supplier, we run every plate through our in-house lab for chemical composition and tensile verification before release — the same batch data appears on the mill test certificate handed to the buyer.
Engineering Compliance and Grade Selection for Load-Bearing Structures
Q235 and Q345 belong to the Chinese GB/T 700 and GB/T 1591 standard families, mapping broadly to S235JR and S355JR under EN 10025, and to A36 and A572 Gr.50 under ASTM — but equivalence is never automatic and must be confirmed against project-specific chemical and impact requirements [NEED_CITE: steel grade equivalence tables between GB, EN, and ASTM standards]. For shipbuilding applications, classification society rules may demand additional Charpy impact testing at sub-zero temperatures, which standard mill certificates do not always include. JIS and DIN compliance on this product line means the plates meet dimensional tolerance and surface quality benchmarks recognized across Southeast Asian and Middle Eastern port authorities. Third-party inspection by SGS or BV can be arranged before loading to generate independent verification reports that satisfy both customs and project owner QA teams [NEED_CITE: third-party inspection protocols for structural steel plate shipments].
Understanding Q235 vs Q345: Yield Strength, Weldability, and Cost Trade-offs
Q235 is a mild carbon steel with lower yield strength, chosen for non-critical structural members where formability and weldability matter more than load capacity — typical uses include secondary bracing, walkway supports, and temporary works. Q345 steps up the yield strength significantly, making it the default choice for primary load-bearing frames, crane runway beams, and heavy equipment bases where section weight optimization is critical. Both grades respond well to hot rolled processing, which produces a consistent ferrite-pearlite microstructure that supports clean flame-cutting edges and predictable bending radii. The hot rolled finish itself is a byproduct of the rolling temperature — it leaves a blue-grey oxide layer that provides short-term corrosion resistance during storage and transit, though long-term exposure demands proper surface preparation and coating. Negative tolerance on thickness is a reality in hot rolled plate production; buyers specifying structural calculations must confirm whether their project accepts mill standard tolerance or requires guaranteed minimum thickness.
The Hidden Cost of Ordering Plates Without Verified Chemistry
Plates that arrive on site with unverified chemistry create a cascade of downstream failures: weld procedure qualifications become invalid, structural engineers cannot sign off on as-built records, and customs authorities in markets like the EU and GCC may hold shipments lacking proper EN or ISO documentation [NEED_CITE: customs compliance requirements for structural steel imports in GCC countries]. A Q235 Q345 hot rolled carbon steel plate 1-20mm JIS DIN Factory Direct Supplier that cannot link each plate to its original heat number forces the buyer into expensive re-testing or outright rejection. The real cost is never the plate price — it is the crane idle time, the re-welding, the rescheduled inspection, and the liquidated damages for delayed handover.
Why Project Buyers Source This Plate From Xin Jiyuan
We operate three dedicated production lines running simultaneously, giving us the capacity to fulfill both urgent spot orders and scheduled project deliveries without queuing behind other customers. Every plate leaving our mill carries an original mill test certificate showing heat number, chemical composition, and mechanical test results — no re-issued documents, no broker copies. Our inventory covers over 2,800 specifications across plate, pipe, and section categories, meaning a project team ordering Q345 base plates can consolidate H-beams, welded pipes, and fabricated connections into a single shipment. We hold ISO 9001:2015 certification and Lloyd’s CE marking under EN 10210/10219, and we arrange SGS or BV third-party inspection at the buyer’s request before container sealing. Custom cut-to-size, bending, and welding services are handled in-house, reducing the buyer’s need to coordinate separate fabrication shops. Our export team manages the full documentation package — packing lists, bills of lading, certificates of origin — and optimizes container loading plans to maximize weight utilization for heavy plate shipments.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and tensile properties per GB/T 700 and GB/T 1591, linked to original heat number
- CE certificate under EN 10210/10219 for projects requiring European conformity marking on structural steel components
- ISO 9001:2015 quality management certificate covering the full production and inspection process
- SGS or BV third-party inspection report available upon request, verifying dimensional tolerance and surface quality before shipment
- Full material traceability by heat number from slab to finished plate, recorded in mill production logs
- Export customs documents including packing list, ocean bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Hot rolled Q235/Q345 plates bundled with steel strip ties and edge protectors to prevent coating damage and edge deformation during ocean transit
- Plates separated by wooden spacers within each bundle to allow ventilation and prevent moisture trapping under the hot rolled mill scale
- Container loading plans optimized for 1mm–20mm thickness combinations to maximize payload within 20GP and 40GP weight limits
- Cut-to-size plates stacked by dimension with heat number stenciled on each piece for on-site identification and traceability
- FOB, CIF, and DDP shipping terms available, with professional export documentation handling for Middle East, Southeast Asia, and African ports
How to Request a Quote and Verify Material Compliance
Submit your plate specifications — grade, thickness, width, length, quantity, and destination port — and receive a detailed quotation with factory-direct pricing, typical production lead times, and a sample mill test certificate format within hours. For project buyers requiring SGS/BV third-party inspection or custom cut-to-size processing, confirm these requirements at the inquiry stage so the production schedule and documentation package can be aligned from the start.
Start Your Q235/Q345 Plate Procurement With Verified Mill Documentation
Send your specifications and destination details to receive factory-direct pricing and original mill test certificates.
Contact:
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Website: www.sdxinjiyuan.com
