Description
Factory-Direct Carbon Steel Plates — Hot-rolled Q235 Q345 A36 SS400 plates verified against mill certificates before shipment, eliminating grade substitution risk on structural projects.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 SS400 A36 Carbon Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | Q235, Q345, SS400, A36, S235JR, S355JR, St37-2, Q195, Q460, SS330, SS540, ST12, ST14, SPHC |
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Section Shape | Flat Plate |
| Size Range | Width 1000–2500 mm, Length 2000–12000 mm |
| Thickness | 0.35–200 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, Boilers, Containers |
| MOQ | 28 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & EPC | Building column base plates, bridge deck stiffeners, industrial platform flooring |
| Shipbuilding | Hull plate sections, deck plating, bulkhead panels |
| Petrochemical | Pressure vessel shells, storage tank bottoms, pipe support saddles |
| Machinery Manufacturing | Equipment base frames, crane boom side plates, conveyor support structures |
| Structural Fabrication | Welded box girders, column splice plates, moment connection plates |
When ASTM A36 and Q345 Arrive on the Same Drawing — Which Mill Certificate Holds Up
Grade equivalence documentation decides whether the plate passes inspection or gets rejected at the port.
On a high-rise project in Riyadh, we received a batch of 20mm carbon steel plates labeled Q345B — but when the client’s third-party inspector ran tensile tests, the yield strength barely hit Q235 levels. The whole lot got rejected, the structure was already half-framed, and we scrambled to air-freight replacements. That single shipment cost us months of trust. Now every ASTM A36 Q235 Q345 carbon steel plate supplier shipment we handle gets verified against original mill certificates before it ever hits the container. [NEED_CITE: steel grade equivalence between EN and ASTM standards]
Missing chemistry data or mismatched mechanical properties don’t just delay a single pour — they cascade through welding procedures, bolt torque schedules, and final structural sign-off. When your ASTM A36 Q235 Q345 carbon steel plate supplier cannot produce heat-number traceable MTCs per batch, customs brokers in the EU will hold the container until CE documentation is reconciled.
Matching Plate Thickness and Grade to Structural Load Paths
Hot-rolled carbon steel plates in the 0.35–200 mm range cover everything from thin gauge cladding backers to heavy base plates under column loads. For EPC contractors framing industrial structures, Q345 plates in the 16–40 mm band carry primary beam-to-column connections where yield strength directly governs section sizing. Shipbuilders specifying S355JR need Charpy impact values at sub-zero temperatures — a requirement the mill must confirm on the MTC, not just the sales sheet. Our in-house physical and chemical laboratory tests every heat before release, so the ASTM A36 Q235 Q345 carbon steel plate supplier documentation you receive matches what arrives on site.
Engineering Compliance Across EN, ASTM, and GB Frameworks
Structural plates for EU-bound projects must carry CE marking under EN 10210 or EN 10219, and the mill test certificate must reference the specific product standard — not just a generic “steel plate” description. ASTM A36 plates shipped to North America require compliance with AISC material requirements, while Q235 and Q345 follow GB/T 709 and GB/T 1591 respectively. [NEED_CITE: EN 10219 cold-formed hollow section requirements] When a single project sources plates across multiple standards, having one ASTM A36 Q235 Q345 carbon steel plate supplier who can issue separate MTCs per standard — with heat numbers traceable to the original slab — eliminates the documentation gaps that trigger customs holds. Custom cutting to exact blank dimensions reduces on-site waste and welding distortion, especially for pressure vessel dished ends and boiler tube sheets.
How Steel Grade Selection Affects Weldability and Fatigue Life
Q235 and A36 sit at the lower end of the carbon equivalent scale, making them straightforward to weld with common SMAW and GMAW processes without preheat — suitable for secondary structures and non-critical connections. Q345 and S355JR offer higher yield strength for primary load-bearing members, but their increased carbon equivalent demands attention to preheat temperatures and heat input limits to avoid hydrogen-induced cracking in thick sections above 30 mm. [NEED_CITE: carbon equivalent and preheat requirements for structural steel] The hot-rolled black surface on these plates is mill-scale, which must be removed by shot blasting before painting or galvanizing if the design calls for corrosion protection in marine or industrial environments. Thickness tolerance of ±1% means a nominal 20mm plate could measure 19.8mm — acceptable for most structural work, but pressure vessel fabricators often require tighter tolerances negotiated at order stage.
The Real Cost of Accepting Plates Without Verified Chemistry
When a mill substitutes a lower grade without documentation, the structural engineer’s calculations no longer match the as-built material. A Q345 connection designed for 345 MPa yield suddenly performs at 235 MPa — the safety factor shrinks, deflections increase, and the inspector flags the discrepancy during final walkthrough. Rework means cutting out welded connections, sourcing replacement plates, and re-welding under schedule pressure. [NEED_CITE: structural steel inspection requirements for material substitution] ASTM A36 Q235 Q345 carbon steel plate supplier shipments without third-party inspection reports from SGS or BV leave the buyer exposed when the receiving country’s authority demands independent verification. The cost of air-freighting 20 tons of replacement plates dwarfs the price difference between verified and unverified material.
Why Procurement Teams Consolidate Plate Orders with Us
We operate three dedicated production lines with in-house physical and chemical laboratories, meaning every plate is tested for chemistry and mechanical properties before it leaves the mill — not sampled from a neighboring coil. Our ASTM A36 Q235 Q345 carbon steel plate supplier capability covers 2,800+ specifications across thicknesses up to 200mm, including non-standard widths and lengths that typical traders cannot source without weeks of delay. CE certification under EN 10210/EN 10219 and ISO 9001:2015 registration ensure your EU and international projects clear customs without documentation disputes. We hold 41 invention patents and participated in drafting China’s cold-formed steel industry standards — technical depth that translates into accurate grade recommendations when your drawing calls for a material we can cross-reference across GB, ASTM, EN, and JIS systems. Professional loading plans optimize container weight distribution for heavy plate shipments, and our logistics team coordinates FOB, CIF, and DDP terms to 50+ countries with real-time tracking.
Documentation & Compliance
- Mill test certificate documenting Q235/Q345 chemical composition and mechanical properties per GB/T 709 and GB/T 1591, with heat number traceability to the original slab
- CE certificate confirming compliance with EN 10210/EN 10219 for S235JR and S355JR plates destined for EU construction projects
- ISO 9001:2015 quality management certificate covering the full production process from incoming raw material inspection to final dimensional verification
- SGS or BV third-party inspection report available upon request, covering visual examination, dimensional checks, and witness testing for mechanical properties
- Material traceability report linking each plate to its heat number, rolling schedule, and test results for both chemical composition and tensile/impact performance
- Customs documentation package including packing list, bill of lading, and certificate of origin formatted for the destination country’s import requirements
Packaging, Loading & Delivery
- Hot-rolled black surface plates bundled with high-tensile steel strips at intervals matching the 2000–12000 mm length range, with edge protectors to prevent coating damage during handling
- Surface protection via mill oil coating applied before bundling to prevent rust formation during ocean transit, especially critical for Q235 and A36 grades destined for humid climates
- Container loading plans optimized for 28-ton MOQ shipments, with weight distribution calculated to maximize payload while maintaining axle load limits at destination port
- Custom cutting service available to deliver plates in exact blank dimensions, reducing on-site cutting waste and improving material utilization for pressure vessel and boiler fabrication
- Each plate marked with heat number, steel grade, and dimensional identification per the mill’s standard practice, with bundle tags duplicating the information for quick yard identification
- Logistics coordination across FOB, CIF, and DDP terms with door-to-door delivery to 50+ countries, including project cargo handling for oversized plates exceeding standard container dimensions
Getting Your Quote with Verified Mill Documentation
Submit your plate specifications — including steel grade, thickness, width, length, quantity, and destination port — and receive a detailed quotation within 12 hours, complete with applicable mill test certificate formats and CE/ISO documentation confirmation. For non-standard dimensions or project-specific grade requirements, our technical team provides cross-reference guidance across GB, ASTM, EN, and JIS standards to ensure your procurement matches the engineering specification.
Request Your ASTM A36 Q235 Q345 Carbon Steel Plate Quotation
Send your specifications via email or WhatsApp to receive pricing, mill test certificate samples, and delivery timelines — with full documentation support from order confirmation through customs clearance.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Email: admin@sdxjysteel.com
WhatsApp: +86 188 5315 7756
