Description
One-Stop Steel Plate Procurement — SS400, Q235, and A36 hot rolled carbon steel plates in 6mm×1500mm×6000mm with bending processing, stocked from our own mill inventory of 2,800+ specifications.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SS400/Q235/A36 Hot Rolled Carbon Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | SS400, Q235, A36 |
| Standard | ASTM / DIN / JIS |
| Section Shape | Flat Plate |
| Thickness | 6mm |
| Width | 1500mm |
| Length | 6000mm |
| Technique | Hot Rolled |
| Surface Treatment | Hot Rolled (Black) |
| Process | Bending Processed |
| Application | Steel structure fabrication / Construction / Industrial platforms / Pressure vessels / Shipbuilding / General engineering |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Steel Structure Fabrication | Building frame columns and beams, truss connection gussets, base plates for column anchoring |
| Industrial Construction | Platform walkways, mezzanine floor grating supports, equipment mounting bases |
| Infrastructure & Civil Engineering | Bridge stiffener plates, retaining wall anchor plates, culvert reinforcement liners |
| Pressure Vessel & Tank Fabrication | Non-pressurized tank shells, containment bund walls, access hatch frames |
| Shipbuilding & Marine | Deck stiffener plates, bulkhead framing brackets, hatch cover support ribs |
Negative Tolerance on 6mm Plate: The Hidden Weight Loss That Fails Inspection
A 6mm hot rolled plate arriving at 5.2mm means 13% material loss — and the entire container gets rejected at site.
When procurement teams order SS400 Q235 A36 hot rolled carbon steel plate in 6mm thickness for structural fabrication, the mill tolerance band becomes the single most contested issue at delivery. Third-party inspectors measuring with ultrasonic gauges routinely find plates at the lower boundary or beyond — and when the project specification calls for minimum 6mm, anything below triggers a full lot rejection. The cost is not just the plate itself; it is the demurrage, the re-order lead time, and the idle crane waiting for replacement material. [NEED_CITE: hot rolled steel plate thickness tolerance standards per ASTM A6 / JIS G 3193]
Matching Bending-Processed Plate to Structural Frame Fabrication
When a general contractor in the Middle East orders SS400 Q235 A36 hot rolled carbon steel plate with pre-bending, the plates arrive already formed to the required radius or angle for column base connections and truss node plates. This eliminates the secondary bending step at the fabrication yard — where inconsistent heating can alter the metallurgical properties of a 6mm section. The hot rolled black surface accepts shop primer directly after shot blasting, and the flatness tolerance of a 1500mm×6000mm plate ensures clean fit-up against welded flanges. Our own mill produces the raw slab, rolls the plate, and performs the bending — so the heat number on the MTC traces straight back to the ladle analysis without a third-party dealer in the chain.
Engineering Compliance Across ASTM, DIN, and JIS Frameworks
Structural engineers specifying A36 for North American projects or SS400 for Japanese-standard designs need the plate to carry the correct certification mark at customs. A 6mm hot rolled plate conforming to ASTM A36 ships with an MTC referencing the A36 chemical composition and mechanical requirements; the same plate ordered under JIS G 3101 SS400 carries a different test report format — even though the base material may come from the same coil. DIN standards add dimensional tolerance requirements for flatness and camber that differ from both ASTM and JIS, which matters when the plate is being welded into a precision jig. [NEED_CITE: steel grade equivalence tables between ASTM A36 JIS SS400 and EN S235JR] Procurement teams who do not specify the exact standard at inquiry stage frequently receive plates with MTCs that the receiving inspector cannot match to the drawing callout.
Understanding Hot Rolled Carbon Steel Plate Grades and Bending Behavior
SS400, Q235, and A36 all fall into the mild carbon steel category, but they originate from three different national standard systems — JIS G 3101, GB/T 700, and ASTM A36 respectively. The carbon content across all three remains low enough to permit cold bending at 6mm thickness without pre-heating, though the minimum inside bend radius varies with the grade and the rolling direction. Hot rolled black surface retains a thin iron oxide layer that provides short-term rust resistance during storage but requires blast cleaning to Sa 2.5 before any protective coating is applied. The 6mm thickness sits at the boundary where plate and sheet classification shifts in several standards — affecting how tolerance tables are read and how the material is rated for load-bearing in structural calculations. [NEED_CITE: hot rolled plate bending radius guidelines relative to thickness and rolling direction]
The Real Cost of Unverified Plate Thickness and Grade Substitution
Ordering SS400 Q235 A36 hot rolled carbon steel plate from a trader who sources from multiple mills creates two risks: the MTC may not correspond to the physical plates in the container, and the thickness may sit at the extreme negative end of the tolerance band. When a 6mm plate measures 5.2mm across the lot, the structural engineer must recalculate the load capacity — and if the design has no margin, the entire batch becomes scrap. Customs authorities in the EU and Middle East increasingly cross-check MTC chemistry against the physical markings on each plate; mismatches trigger hold orders. [NEED_CITE: EN 10204 inspection document types 3.1 and 3.2 requirements for structural steel]
Why Fabricators Source This Plate From an Integrated Mill
Our Jinan facility operates three production lines for hot rolled plate and maintains over 2,800 steel specifications in stock — meaning a 6mm×1500mm×6000mm order in SS400, Q235, or A36 can be pulled from finished inventory rather than queued behind a new rolling schedule. The bending processing is done in-house on CNC press brakes calibrated to the specific grade and thickness, so the formed dimensions are verified against the shop drawing before the plate leaves the workshop. Every plate carries a heat number that links back to our in-house laboratory’s chemical analysis and mechanical test results — no certificate from an unknown subcontractor. Third-party inspection by SGS, BV, or TüV is arranged at our facility before loading, not at a distant port warehouse.
Documentation & Compliance
- Mill Test Certificate documenting SS400, Q235, or A36 chemical composition and mechanical properties per JIS G 3101, GB/T 700, or ASTM A36, issued under EN 10204 3.1 format
- Third-party inspection report from SGS, BV, or TüV covering dimensional verification, surface quality, and ultrasonic thickness measurement on 6mm plates
- Material traceability sheet linking each plate’s heat number to ladle analysis, rolling date, and bending processing record
- Customs documentation package including packing list, bill of lading, and certificate of origin formatted for destination port requirements
- Welding procedure specification (WPS) and procedure qualification record (PQR) available for the specific grade when plates are destined for welded structural assemblies
- ISO 9001 quality management certificate covering the full production scope from slab reheating through hot rolling, bending, and final inspection
Packaging, Loading & Delivery
- 6mm×1500mm×6000mm hot rolled black plates stacked in bundles secured with steel strapping, with edge protectors to prevent corner damage during transit
- Surface protection by anti-rust oil coating applied after rolling to prevent black oxide flaking during ocean shipment
- Container loading optimized for 6mm plate weight distribution across 20ft and 40ft open-top or flat-rack units, with timber dunnage separating layers
- Heat number and grade marking stenciled on each plate surface in weather-resistant paint, with bundle tags matching the MTC
- FOB Jinan or Qingdao port, with CIF and DDP options available to major ports across the Middle East, Southeast Asia, and Africa
- Custom cutting to non-standard lengths available before shipment, with kerf allowance calculated and charged per actual weight
Getting Your Quotation Right the First Time
Submit your drawing or specification sheet listing the exact grade (SS400, Q235, or A36), thickness, width, length, and quantity — along with the destination port and required certification standard. We return a detailed quotation within 24 hours covering material, bending processing, surface treatment, packing, and freight, with a clear breakdown of the MTC format and third-party inspection scope included.
Frequently Asked Questions
Q: What is the difference between SS400, Q235, and A36 for the same 6mm plate?
A: All three are mild carbon steel grades from different national standards — JIS, GB, and ASTM respectively. The chemical composition and mechanical property requirements differ slightly, and the MTC format follows the corresponding standard. The physical plate may be interchangeable for many general structural applications, but the engineer’s specification and the customs documentation must match the designated grade.
Q: Can you provide third-party inspection before shipment for 6mm hot rolled plates?
A: Yes. SGS, BV, and TüV inspections are arranged at our Jinan facility. The inspection covers dimensional checks including ultrasonic thickness measurement, visual surface quality assessment, and verification of heat number markings against the MTC. The inspection report is issued before the plates are released for container loading.
Q: What is the thickness tolerance for 6mm hot rolled carbon steel plate?
A: Thickness tolerance follows the applicable standard — ASTM A6 for A36, JIS G 3193 for SS400, and GB/T 709 for Q235. The tolerance band differs across these standards. We produce to standard tolerance by default; if your project requires tighter tolerance, specify this at inquiry so we can confirm availability and any price adjustment.
Q: Do you offer custom bending for 6mm plates to match our shop drawings?
A: Yes. Bending is performed on CNC press brakes at our fabrication workshop. Submit your shop drawing with bend radius, angle, and flat-to-flat dimensions. We return a bending feasibility assessment and include the processing cost in the quotation. Formed plates are dimensionally inspected before packing.
Q: What documentation do you provide for customs clearance and project handover?
A: Each shipment includes a full documentation package: commercial invoice, packing list, bill of lading, certificate of origin, Mill Test Certificate per EN 10204 3.1, and third-party inspection report if requested. All documents are prepared in English and formatted to the requirements of the destination country’s import regulations.
Get Your SS400 Q235 A36 Hot Rolled Carbon Steel Plate Quotation
Send your specification and quantity to receive a detailed offer with MTC sample and production timeline.
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
