Description
Factory-Direct Hot Rolled Carbon Steel Plate — Our own steel mill with 3 production lines and 2,800+ raw material specifications ensures full traceability from slab to delivered plate, eliminating third-party sourcing gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345 Carbon Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | Q235, Q235B, Q345, Q345B, Q195, St37, St42, St37-2, St35.4, St52.4, St35 |
| Standard | ISO9001, JIS, GS |
| Width | 600-2000mm |
| Length | 12m or custom required |
| Tolerance | ±1% |
| Technique | Hot Rolled / Cold Rolled |
| Surface Treatment | Hot Rolled |
| Processing Service | Welding, Punching, Cutting, Bending |
| Packing | Standard Seaworthy Packing |
| Application | Construction, Building Structures, Fabrication, Industrial Projects |
| MOQ | 5 Tons |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Building Construction | Base plates, column base connections, floor decking supports |
| Infrastructure Projects | Bridge gusset plates, foundation anchor plates, retaining wall brackets |
| Industrial Fabrication | Machine base frames, conveyor support structures, platform grating frames |
| EPC Projects | Warehouse portal frames, equipment skid base plates, pipe rack supports |
Why Dimensional Tolerance on Carbon Steel Plate Determines Weld Fit-Up Costs on Site
A ±1% tolerance gap between plates from different suppliers means re-cutting, re-drilling, and schedule delays at the assembly stage.
When structural steel plates arrive at a Middle East or African job site with inconsistent width or thickness, welders spend hours grinding edges to achieve proper fit-up before any welding begins. For Hot Rolled Carbon Steel Plate Q235 Q345 Supplier orders spanning multiple heats, thickness variation beyond tolerance forces fabricators to reject entire batches — even when chemistry and mechanical properties pass. We have seen projects where plates sourced from three different traders could not be assembled into a single truss connection because edge straightness and flatness varied by supplier. [NEED_CITE: dimensional tolerance requirements for structural steel plates in EN 10029]
Matching Q235 and Q345 Grades to Structural Load Requirements
For building frames and industrial platforms, Q235 plates serve as non-load-bearing base plates and connection brackets where moderate strength suffices. Q345 plates step up to primary load paths — column bases, beam-to-column moment connections, and crane runway supports — where higher yield strength reduces plate thickness and overall weight. As a Hot Rolled Carbon Steel Plate Q235 Q345 Supplier with vertically integrated production, we cast, roll, and plate-process Q235 and Q345 under one quality system, so every plate carries consistent chemistry from the same heat number regardless of whether you order 5 tons or 500 tons.
Engineering Compliance and Certification for International Projects
Structural plates for EU-bound projects require EN 10204 3.1 or 3.2 certificates with full chemical and mechanical traceability. Middle East EPC specifications often call for third-party inspection by SGS or BV before loading. African infrastructure tenders demand certificates of origin and mill test reports matching heat numbers stamped on every plate. Our Hot Rolled Carbon Steel Plate Q235 Q345 Supplier documentation package covers all three corridors — EN, ASTM-equivalent grade mapping, and SGS/BV witness points — prepared in-house before the plate leaves Jinan. [NEED_CITE: EN 10204 inspection document types for steel products]
Hot Rolling Process and Surface Condition for Fabrication
Hot rolled Q235 and Q345 plates develop a mill scale surface that must be removed by shot blasting before welding or painting. The hot rolling process produces a uniform grain structure through controlled cooling, giving Q345 its higher yield strength compared to Q235 without additional alloying. Width range from 600mm to 2000mm covers most gusset plate and base plate dimensions without requiring welded拼板, reducing fabrication cost. Custom lengths up to 12m allow fabricators to nest multiple parts from a single plate, minimizing scrap.
The Hidden Cost of Sourcing Plates from Trading Companies
When a trading company supplies Q345 plates sourced from an unknown mill, the mill test certificate may show correct chemistry but the actual rolling reduction and cooling rate remain unverified. This leads to plates that pass lab tests but crack during bending or drilling — a failure mode we have traced back to improper thermomechanical control at mills that cut costs on controlled rolling. For Hot Rolled Carbon Steel Plate Q235 Q345 Supplier procurement, the risk is not just material rejection but structural safety liability once plates are welded into load-bearing frames. [NEED_CITE: thermomechanical rolling requirements for structural steel plates]
Why Procurement Teams Choose Our Vertically Integrated Supply
We operate our own steel mill with 3 production lines and over 2,800 raw material specifications, meaning every Hot Rolled Carbon Steel Plate Q235 Q345 Supplier order starts from slabs we cast ourselves — no third-party plate sourcing, no certificate chain gaps. Our in-house理化实验室 tests every heat for chemical composition and mechanical properties before plates are released for cutting. CNC plasma cutting, drilling, and bending services let you receive finished components rather than raw plates, reducing your fab shop workload. Standard seaworthy packing with edge protectors preserves plate surface quality during ocean freight to Middle East, Southeast Asia, and African ports. We hold ISO 9001 certification and accommodate SGS/BV/TÜV third-party inspection at any production stage.
Documentation & Compliance
- Mill test certificate per EN 10204 3.1 documenting Q235B and Q345B chemical composition, yield strength, and tensile properties by heat number
- ISO 9001 quality management certificate covering the full production chain from slab casting to plate cutting and packing
- SGS or BV third-party inspection report available for pre-shipment dimensional verification and visual surface examination
- Material traceability report linking each plate to its original heat number, rolling schedule, and test specimen location
- Certificate of origin and customs documentation including packing list, bill of lading, and commercial invoice for destination port clearance
- Grade equivalence mapping between Q235/Q345 and European St37/St52 designations for engineering approval submissions
Packaging, Loading & Delivery
- Hot rolled Q235 and Q345 plates bundled with steel straps and edge protectors to prevent surface damage and mill scale flaking during ocean transit
- Standard seaworthy packing with waterproof paper interleave for plates destined to humid coastal ports in Southeast Asia and West Africa
- Custom cut-to-length plates up to 12m nested and strapped separately by heat number for easy site identification and traceability
- Container loading optimized for 600-2000mm width plates with wooden cradles to prevent edge deformation during handling
- Heat number and steel grade stamped on every plate corner with weather-resistant paint for permanent site identification
- FOB, CIF, and DDP delivery terms available with professional oversized cargo loading plans for heavy plate shipments
Start Your Plate Procurement with Complete Documentation
Submit your project drawings, steel grade requirements, plate dimensions, and destination port to receive a detailed quotation including material cost, CNC processing charges, packing, and freight — along with sample mill test certificates for your engineering team’s review.
Request Hot Rolled Carbon Steel Plate Quotation with Mill Test Certificates
Share your specifications, steel grades, and quantities to receive pricing and documentation samples within 24 hours.
Company: 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 and Q345 for structural plate applications?
A: Q235 is a mild carbon steel grade suitable for non-load-bearing base plates, brackets, and connection accessories. Q345 offers higher yield strength for primary structural members such as column bases, beam connections, and crane supports. Both grades are available in hot rolled condition with full mill test certification.
Q: Can you supply Q235 plates with EN 10204 3.2 third-party certification for EU projects?
A: Yes. We provide EN 10204 3.2 certificates witnessed by independent inspection agencies such as SGS, BV, or TÜV. The inspection covers chemical composition verification, mechanical testing, and dimensional checks against your project specifications.
Q: What is the minimum order quantity for custom-cut plates versus standard mill sizes?
A: The MOQ is 5 tons for both standard mill plates and custom-cut plates processed to your drawing dimensions. Custom cutting includes CNC plasma cutting, drilling, and edge preparation per your fabrication requirements.
Q: How do you ensure dimensional accuracy for CNC-processed plates?
A: All CNC cutting and drilling is performed on computer-controlled equipment with ±1mm positional accuracy. Each processed plate undergoes dimensional inspection against approved shop drawings before packing, with inspection reports included in the documentation package.
Q: What grade equivalence mapping do you provide for international engineering approvals?
A: We supply grade equivalence documentation mapping Q235 to S235JR/St37, Q345 to S355JR/St52, and other international designations. This mapping supports engineering submissions for projects in Europe, Middle East, and Africa where local codes reference EN or ASTM standards.
