Description
Factory-direct SS400 Q235 Q345 hot rolled carbon steel plate — Produced on our own mill lines with full heat-number traceability from slab to finished plate, eliminating third-party material gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SS400 / Q235 / Q345 Hot Rolled Carbon Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | SS400, Q235, Q345 |
| Standard | JIS G3101 (SS400), ASTM A36, DIN EN 10025, GB/T 709 |
| Thickness | 1.2 mm – 2.0 mm |
| Technique | Hot Rolled |
| Surface Treatment | As-rolled (Black) |
| Application | Building construction, industrial fabrication, structural steel processing, machinery base plates, platform and flooring |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC & General Contracting | Building frame gussets, column base plates, platform grating supports |
| Industrial Fabrication | Machinery mounting plates, conveyor frame brackets, equipment skid bases |
| Infrastructure | Bridge walkway decking, pipeline support saddles, utility platform flooring |
| Warehouse & Logistics | Mezzanine floor plates, racking base shims, loading dock structural inserts |
Why Material Traceability Gaps Cost More Than the Plate Itself
A missing heat number on a mill test certificate can halt an entire project at customs or on-site inspection.
When buyers source thin hot rolled plates from traders rather than integrated mills, the chain between raw slab chemistry and finished plate certification often breaks. I have seen shipments held at port because the MTC referenced a heat number that did not match the stamped markings on the plates — a problem that traces back to mixed-batch stockyard handling at intermediary warehouses. With SS400 Q235 Q345 hot rolled carbon steel plate supply running through a single facility from steelmaking to cutting, every plate carries a traceable heat number linked to its actual chemical composition and mechanical test data. [NEED_CITE: material traceability requirements under EN 10204 3.1 certification]
Matching Thin-Gauge Hot Rolled Plate to Structural and Fabrication Use
The 1.2 mm to 2.0 mm thickness range of this SS400 Q235 Q345 hot rolled carbon steel plate targets applications where dimensional flatness and consistent surface quality matter more than heavy-load bearing. For machinery base plates, the hot rolled finish provides adequate surface texture for welding and painting without additional shot blasting. For platform flooring and cladding support in industrial buildings, the as-rolled condition delivers sufficient corrosion resistance for indoor or sheltered environments — and accepts shop-applied coatings cleanly when outdoor exposure demands it.
Engineering Compliance Across JIS, ASTM, and DIN Frameworks
Projects spanning multiple procurement zones often require plates that satisfy parallel standard systems. SS400 under JIS G3101, Q235 under GB/T 709, and A36 under ASTM share overlapping chemistry and mechanical envelopes, but formal equivalence must be documented per project specification — not assumed. [NEED_CITE: steel grade equivalence between JIS SS400 and ASTM A36] Our engineering team reviews shop drawings against the applicable standard, confirms grade substitution acceptability, and flags any tension between specified chemistry limits and available mill production heats. For EU-bound shipments, DIN EN 10025 compliance documentation and CE marking readiness are prepared alongside the standard MTC package.
Understanding the Three-Grade Range: SS400, Q235, and Q345
These three grades represent distinct strength tiers across different standard systems. Q235 and SS400 occupy the general structural carbon steel category — suitable for non-critical load-bearing frames, enclosures, and fabrication where welding and formability take priority over high yield strength. Q345 steps into the low-alloy high-strength category, offering meaningfully higher yield capacity for structural members subject to heavier loading or seismic design requirements. The hot rolling process produces a scale-free black surface with consistent grain structure through the cross-section, which supports reliable welding performance across all three grades without pre-heating in typical thickness ranges. [NEED_CITE: hot rolled plate surface quality and weldability characteristics]
The Hidden Price of Unverified Plate Sourcing
Plates sourced through trading intermediaries often arrive with MTC documents that cannot be cross-referenced to physical markings — a gap that triggers rejection during third-party inspection or structural audit. Negative tolerance stacking on thin-gauge plates (1.2–2.0 mm) compounds the problem: a plate delivered at the lower edge of permissible thickness variation reduces actual load capacity below design assumptions, even when chemistry passes. Engineering codes require verified material properties, not supplier declarations. [NEED_CITE: dimensional tolerance standards for hot rolled steel plate per GB/T 709]
Integrated Mill Control From Slab to Shipped Plate
Our production of SS400 Q235 Q345 hot rolled carbon steel plate runs through a vertically integrated chain: our own steel mill melts and casts the slab, our hot rolling lines finish the plate, and our in-house laboratory tests every heat before release. This eliminates the material provenance gaps that arise when fabricators buy plates from unrelated traders. The facility holds over 2,800 raw material specifications in stock, enabling consolidated orders across multiple grades and thicknesses in a single shipment. Third-party inspection through SGS, BV, or TÜV is arranged on demand for pre-shipment verification. Custom cutting to project-specific dimensions is available with documented edge quality and dimensional reports.
Documentation & Compliance
- Mill Test Certificate per EN 10204 3.1 documenting SS400, Q235, or Q345 chemical composition and mechanical test results linked to individual heat numbers
- CE marking and Declaration of Performance for projects requiring EN 10025 compliance in European Union markets
- ISO 9001 quality management certification covering the full production process from raw material incoming inspection to finished plate dispatch
- Third-party inspection reports from SGS, BV, or TÜV confirming dimensional accuracy, surface condition, and mechanical properties prior to shipment
- Full material traceability package connecting each plate to its original heat number, rolling schedule, and test specimen location
- Export documentation set including commercial invoice, packing list, bill of lading, and certificate of origin aligned with destination country customs requirements
Packaging, Loading & Delivery
- As-rolled SS400 Q235 Q345 hot rolled carbon steel plate bundled with steel straps and edge protectors to prevent surface scratching and edge deformation during ocean freight
- Anti-rust oil applied to plate surfaces before bundling when shipment destination involves high-humidity transit or extended port storage
- Container loading optimized for 1.2–2.0 mm thickness plates using interleaved wooden separators and weight-distributed stowage plans to maximize payload within 20ft and 40ft units
- Custom cutting to project-specified lengths and widths available, with cut pieces individually tagged by heat number and grade for on-site identification
- Shipping marks stenciled on each bundle showing steel grade, thickness, heat number, and purchase order reference for rapid site verification
- Delivery terms available across FOB, CIF, and DDP with professional oversized cargo handling and real-time shipment tracking to final destination
Start Your Quotation With Drawings and Grade Requirements
Send your project drawings in PDF or DWG format along with specified steel grade, thickness, quantity, and destination port. Our team responds within one working day with a detailed quotation covering material cost, fabrication options, coating if required, packing, and freight — plus the expected production timeline and mill test certificate documentation scope.
Request Your SS400 Q235 Q345 Hot Rolled Carbon Steel Plate Quotation
Share your specifications and standards to receive pricing, MTC samples, and delivery terms.
Company: 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
