Description
Direct Mill Supply with Full Traceability — Q235 and Q355 hot rolled plates produced in-house with heat number tracking from slab to finished sheet.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q355 Hot Rolled Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | Q195, Q215, Q235, Q255, Q275, Q355, SS400, S275, S355 |
| Standard | AISI, ASTM, GB |
| Section Shape | Flat plate |
| Size Range | Thickness 1.8–20mm, Width 50–2200mm, Length up to 12m |
| Technique | Hot Rolled / Cold Rolled |
| Surface Treatment | Oiled / Non-oiled / DOS Oiled |
| Tolerance | ±1% |
| Ends | Mill edge / Cut edge |
| Application | Container manufacturing, Shipbuilding, Structural fabrication, Cutting & bending processing, Industrial platforms, Construction |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Structural Fabrication & EPC | Building frames, column base plates, connection gussets, platform grating supports |
| Shipbuilding & Marine | Deck plating, bulkhead stiffeners, hull patch panels |
| Container Manufacturing | Floor cross members, corner castings, side wall reinforcement plates |
| Industrial Equipment | Machine base plates, conveyor frame gussets, hopper liners |
| Infrastructure & Construction | Bridge bearing plates, embedded anchor plates, formwork support brackets |
Why Thickness Tolerance Decides Fabrication Cost on a Plate Order
A plate that measures 0.4mm under nominal at the edge can invalidate an entire CNC nesting plan.
When overseas buyers source Hot Rolled Carbon Steel Plate for Cutting and Welding Supplier from fragmented traders, dimensional inconsistency surfaces only after the first plasma cut. Edge plates from the same batch arrive thinner than center plates, forcing welders to adjust penetration parameters mid-job — or worse, scrap pieces that fail fit-up inspection. Material traceability gaps compound the problem: without heat number linkage from slab to sheet, mill test certificates become meaningless paperwork. [NEED_CITE: EN 10204 inspection document types for steel products]
How Multi-Grade Availability Matches Structural and Pressure Demands
Projects rarely need a single grade. A warehouse EPC may specify Q235B for secondary bracing but require Q355B for main portal frame connections — both sourced from the same mill heat to avoid galvanic mismatch during welding. Our vertically integrated production line rolls Q195 through Q355 and international equivalents S275, S355, SS400 on the same schedule, letting buyers consolidate grades into one shipment. The Hot Rolled Carbon Steel Plate for Cutting and Welding Supplier capability covers 1.8mm light gauge for container flooring up to 20mm heavy plate for column base connections, all within ±1% thickness tolerance.
Engineering Compliance Across EN, ASTM, and GB Frameworks
Structural steel plates for EU-bound projects must conform to EN 10025 chemical and mechanical requirements, while North American EPCs reference ASTM A36 or A572. Chinese GB/T 700 Q235 and GB/T 1591 Q355 map to these systems through established equivalence tables — but the mapping must be documented, not assumed. [NEED_CITE: steel grade equivalence between EN and ASTM standards] Third-party inspection by SGS or BV before shipment confirms chemistry and mechanical properties against the specified standard, preventing customs holds at destination ports. For shipbuilding applications, mill certificates referencing CCS, DNV, or ABS class society approvals accompany each consignment.
Understanding Grade Selection and Rolling Process for Plate Applications
Q235 remains the workhorse grade for general structural fabrication — adequate yield strength for building frames, platforms, and non-pressure containers. Q355 steps up for heavier load paths: crane runways, bridge girders, and industrial equipment bases where higher yield reduces section weight. The hot rolling process produces a mill scale surface that accepts shop primer directly, while cold rolled variants offer tighter surface finish for visible architectural elements. Surface treatment choice — oiled for transit corrosion protection, non-oiled for immediate painting, or DOS oiled for deep-drawing applications — depends on downstream processing. Thickness tolerance of ±1% ensures CNC plasma cutters maintain consistent kerf compensation across the full 50–2200mm width range.
Hidden Costs When Material Certification Falls Short
A shipment of Q355 plates arriving without valid mill test certificates triggers full re-testing at destination — costing thousands in laboratory fees and weeks of schedule delay. Mixed-grade delivery, where S275 plates are bundled with Q235 without clear separation, creates welding procedure qualification failures when fabricators assume uniform chemistry. [NEED_CITE: EN 10204 inspection document requirements for structural steel] Oversized plates beyond 12m length require specialized flat-rack container loading; without proper lashing planning, edge damage during ocean transit forces costly re-rolling or rejection.
Why Buyers Consolidate Plate Procurement with Xin Jiyuan
Our own steel mill produces 2,800+ specifications of raw material, eliminating the sourcing gap between slab producer and plate processor. Every Hot Rolled Carbon Steel Plate for Cutting and Welding Supplier order carries full heat number traceability from our melt shop to your fabrication floor. In-house CNC cutting, plasma cutting, drilling, and edge beveling mean plates arrive fabrication-ready — no secondary processing at your yard. Certified welding procedures (AWS/EN) and qualified welders handle any custom fabrication per your engineering drawings. Complete quality documentation packages — WPS, PQR, weld maps, dimensional reports — travel with every shipment. Professional loading teams manage oversized plate logistics for EU, Middle East, Southeast Asian, and African project sites.
Documentation & Compliance
- Mill Test Certificate documenting Q235/Q355 chemical composition and mechanical properties per GB/T 700 or GB/T 1591, with heat number traceability
- EN 10204 3.1 or 3.2 inspection certificates for EU structural projects requiring third-party witness testing
- ISO 9001 quality management certificate covering the full production chain from steelmaking to plate finishing
- SGS or BV third-party inspection report confirming dimensional tolerance, surface condition, and marking prior to shipment
- Material traceability report linking each plate to its original heat number, slab casting record, and rolling schedule
- Full customs documentation package including packing list, bill of lading, and certificate of origin for destination port clearance
Packaging, Loading & Delivery
- Hot rolled Q235 and Q355 plates bundled with high-tensile steel strips and edge protectors to prevent coil edge damage during ocean transit
- Oiled surface treatment applied uniformly to prevent rust formation during storage and shipping, especially for non-oiled orders requiring immediate painting upon arrival
- 12m length plates loaded in dedicated flat-rack containers with timber dunnage separation; shorter cut-to-size plates consolidated in 20ft or 40ft general purpose containers for cost efficiency
- Cut-to-size plates processed per customer drawings with beveled edges, drilled holes, or cambered profiles, marked with heat number and grade designation on each piece
- Heat number and steel grade stenciled on every plate surface with weather-resistant paint, matching mill test certificate documentation
- FOB, CIF, and DDP shipping terms available with door-to-door logistics coordination for project sites across Middle East, Southeast Asia, and Africa
Start Your Plate Procurement with Verified Specifications
Submit your project drawings (PDF/DWG), steel grade requirements, thickness and width specifications, and destination port to receive a detailed quotation within 24 hours — including material cost, fabrication processing, coating, packing, and shipping breakdown. Our engineering team reviews shop drawings for material optimization and fabrication sequencing before production begins. Confirm certification requirements (EN 10204, SGS, BV) and delivery timeline to align with your project schedule.
Get Your Hot Rolled Plate Quotation with Mill Test Certificate
Share your specifications and required standards to receive pricing, production schedule, and complete documentation package details.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjystructure.com
Website: www.xjystructure.com
Frequently Asked Questions
Q: How do Q235, S275JR, and SS400 compare for structural applications?
A: Q235 (GB/T 700), S275JR (EN 10025), and SS400 (JIS G3101) are general structural grades with similar yield strength ranges. Q235 is the Chinese standard equivalent, widely used for building frames and platforms. S275JR is specified for European projects requiring CE marking under EN 10204. SS400 is common in Japanese-specification projects across Southeast Asia. All three grades are available from our mill with full chemical and mechanical certification.
Q: Can you supply cut-to-size plates with edge preparation per our drawings?
A: Yes. Our in-house processing services include CNC cutting, plasma and flame cutting, drilling, bending, and edge beveling per your engineering drawings. Plates are processed to exact dimensions with beveled edges for welding preparation, drilled holes for bolted connections, or cambered profiles for specific structural requirements. Each processed piece is marked with heat number and grade for traceability.
Q: What certifications and test reports accompany each shipment?
A: Every shipment includes Mill Test Certificate per EN 10204 3.1 documenting chemical composition and mechanical properties, with heat number traceability. Third-party inspection by SGS, BV, or TÜV is available prior to shipment for projects requiring independent verification. ISO 9001 certification covers our quality management system. For EU projects, CE marking documentation and EN 10204 3.2 certificates with third-party witness testing can be provided.
Q: How do you ensure material traceability and prevent mixed-grade delivery?
A: Our vertically integrated production means every plate is tracked from slab casting through rolling to finished product. Heat numbers are assigned at the melt shop and maintained through all processing stages. Each plate is stenciled with grade designation and heat number. During loading, plates of the same grade and heat are bundled together with clear separation markings. Mill test certificates reference specific heat numbers, allowing buyers to verify material identity upon receipt.
Q: What is the production lead time and how do you handle oversized plate logistics?
A: Standard production lead time for stock grades (Q235, Q355) is typical production lead times from contract signing and deposit receipt. Custom grades or non-standard dimensions require additional time for mill scheduling. Plates up to 12m length are loaded in flat-rack containers with professional lashing. Oversized plates exceeding container dimensions are shipped on break-bulk vessels with specialized loading plans. Our logistics team coordinates door-to-door delivery including customs documentation and port clearance support.
