Description
Mill-Direct Hot Rolled Plates — 2,800+ thickness and width combinations held in our own yard, shipped with full heat-number traceability from slab to bundle.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235/Q345/A36 Hot Rolled Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | Q195, Q235, Q345, Q460, A36, S235JR, S355JR, St37-2, SS400, SS330 |
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Thickness | 0.35–200 mm |
| Width | 1000–2500 mm |
| Length | 2000–12000 mm |
| Technique | Hot Rolled |
| Surface Treatment | Black |
| Tolerance | ±1% |
| Processing Service | Bending, Welding, Decoiling, Cutting, Punching |
| Application | Shipbuilding, Construction, Petrochemical, Machinery Manufacturing, Structural Fabrication, Pressure Vessels, Bridges, Industrial Platforms |
| MOQ | 5 Ton |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Structural Fabrication & EPC | Column base plates, beam splice plates, gusset connections, truss node plates |
| Shipbuilding & Offshore | Deck plating, bulkhead stiffeners, hull framing members |
| Petrochemical & Pressure Vessels | Tank shells, saddle supports, platform grating bearers |
| Machinery & Industrial Platforms | Machine bases, crane runway beams, walkway tread plates |
| Bridges & Infrastructure | Splice plates, bearing stiffeners, diaphragm plates |
When Thickness Tolerance Decides Whether a Base Plate Fits
A ±1% tolerance on a 20 mm plate still means ±0.2 mm — tight enough for machined connections, loose enough to cause fit-up gaps if the mill rolls off-center.
Outsourced plate buyers often discover tolerance drift only at assembly: base plates drilled to drawing arrive with actual thickness 0.5 mm under nominal, forcing shims or re-machining on site. On a West African warehouse project I supported, a batch of Q235 plates cut to 18 mm nominal arrived at 17.3 mm actual — the anchor bolt holes no longer aligned with the embedded sleeves, and two weeks of schedule slipped while the crew re-drilled on the ground. [NEED_CITE: hot rolled plate thickness tolerance standards per EN 10029 and ASTM A6]
Matching Plate Grades to Structural Load Paths
A Hot Rolled Steel Plate Q235 S235JR A36 supplier who understands grade equivalence helps you avoid over-specifying. Q235 and S235JR share similar yield ranges for general framing; A36 covers the same ground in ASTM-governed projects. When the engineer calls for S355JR or Q345, the jump in yield strength matters for heavy base plates and bridge stiffeners — but swapping Q235 for S355JR on a non-critical platform grating just adds cost. We cross-reference grades against the project standard before quoting, so a client specifying A36 for a Middle East EPC job gets the right mill certificate without paying for S355JR chemistry they do not need.
Engineering Compliance and Certification Pathways
Structural plates for EU projects must carry CE marking under EN 1090-2, which demands traceable MTCs and approved welding procedures. ASTM A36 plates heading to North America need mill certs conforming to A6/A6M. Our own rolling mill issues EN 10204 3.1 certificates with heat-level chemistry and mechanical data; third-party inspection through SGS or BV is available at any stage. For shipbuilding, we supply plates meeting GB and ASTM ship-plate grades with class society documentation. [NEED_CITE: EN 1090-2 execution class requirements for structural steel fabrication]
Grade Selection and Rolling Process Explained
Hot rolling above recrystallization temperature gives the plate uniform grain structure and predictable formability — essential when the shop will bend, weld, or punch the plate after delivery. Q-series grades (Q195 through Q460) follow the Chinese GB system where the number indicates minimum yield strength in MPa; S-series (S235JR, S355JR) follows EN standards with JR denoting room-temperature impact testing; A36 and SS400 cover ASTM and JIS equivalents respectively. Thickness from 0.35 mm serves light gauge cladding supports, while 200 mm plates handle heavy press foundations and bridge bearings. The black mill scale surface is standard; shot blasting and primer coating are available when the fabrication shop skips surface prep or the project environment demands immediate corrosion protection.
Hidden Costs of Buying the Wrong Grade or Tolerance
Ordering Q235 when the drawing calls for S355JR means the plate fails structural inspection — no amount of re-welding fixes a yield strength shortfall. Plates with negative tolerance beyond the standard get rejected at customs when the inspector measures thickness with an ultrasonic gauge. Missing heat numbers on the MTC block CE marking for EU projects, and the shipment sits at port until the mill reissues documentation. [NEED_CITE: consequences of material grade substitution in structural steel engineering]
Why Source Hot Rolled Plates from XJY Structure
We roll our own slabs into finished plates, so every heat number on your MTC traces back to our melt shop — no third-party mill gaps. Our yard holds over 2,800 specification combinations across thickness, width, and grade, so a mixed order of Q235 base plates and S355JR splice plates ships in one consignment. In-house CNC cutting, plasma cutting, and punching mean your plates arrive sized and hole-drilled per shop drawings, eliminating the secondary handling that damages edges and delays assembly. Certified welding procedures (AWS and EN) cover any welding prep you need done before shipment. Full quality documentation — WPS, PQR, dimensional reports, coating thickness records — travels with every container.
Documentation & Compliance
- Mill Test Certificate per EN 10204 3.1 documenting Q235 and S355JR chemical composition and mechanical properties by heat number
- CE certificate for structural steel plates conforming to EN 1090-2 execution class requirements
- ISO 9001 quality management certificate covering the full rolling and fabrication process
- SGS or BV third-party inspection report available at rolling, cutting, or pre-shipment stage
- Material traceability sheet linking each plate to its heat number, slab record, and rolling pass log
- Export customs documents including packing list, bill of lading, and certificate of origin for the destination country
Packaging, Loading & Delivery
- Plates bundled with steel strips and edge protectors to prevent black scale damage during ocean transit
- Thickness-separated stacking with wooden dunnage to allow forklift access and avoid surface scratching on Q235 and A36 plates
- Cut-to-size plates wrapped individually when dimensions fall below 2000 mm length to prevent bundle shift
- Heat number and grade stenciled on each plate edge for site identification before installation
- Container loading optimized for 2000–12000 mm lengths to maximize 20ft and 40ft OT payload without overhang
- FOB, CIF, and DDP terms available with door-to-door tracking for project sites in the Middle East, Southeast Asia, and Africa
Start Your Plate Inquiry with Drawings and Grade Requirements
Send your project drawings (PDF or DWG), specify steel grade, thickness, width, length, and quantity, and note the destination standard (GB, EN, ASTM, or JIS). We return a detailed quote covering material, cutting, surface treatment, and packing within 24 hours, along with the mill test certificate template and production timeline.
Request a Quote with Full Material Traceability
Share your plate specifications, required standards, and destination port to receive pricing, MTC samples, and a production schedule.
Contact: admin@xjystructure.com | WhatsApp: +86 188 5315 7756
