Description
Direct Mill Supply — Hot rolled plates rolled, tested, and documented under one roof.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 Q345 SS400 A36 Hot Rolled Carbon Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | Q195, Q235, Q345, Q460, SS400, A36, SS330-SS540, ST12-ST14, SPHC-SPHE |
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Thickness | 0.35-200mm |
| Width | 1000-2500mm |
| Length | 2000-12000mm |
| Technique | Hot Rolled |
| Surface Treatment | Black |
| Tolerance | ±1% |
| Processing Service | Bending, Welding, Decoiling, Cutting, Punching |
| Application | Construction, Petrochemical, Machinery Manufacturing, Transportation, Shipbuilding, Bridge, Boiler, Container, Fabrication |
| MOQ | 1 Ton |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Building frames, column base plates, bridge gussets, platform decking |
| Petrochemical & Energy | Pressure vessel shells, boiler end caps, tank farm flooring |
| Machinery Manufacturing | Crane boom side plates, excavator counterweight brackets, conveyor frame gussets |
| Shipbuilding & Transportation | Deck plating, bulkhead stiffeners, container corner castings |
| Steel Fabrication | Beam-to-column connection plates, truss node plates, stair stringers |
What Material Traceability Gaps Cost on a Fabricated Steel Order
A missing heat number on a mill certificate can halt customs clearance and trigger full-batch rejection at site.
When buyers source plates from traders rather than integrated mills, the chain from slab to finished plate breaks. Certificates get reissued, heat numbers get swapped, and third-party inspectors at destination ports flag inconsistencies. I have seen entire shipments of Q235 plates rejected after arrival because the yield strength test results did not align with the declared heat — the cost of ocean freight, insurance, and replacement material fell entirely on the buyer. [NEED_CITE: material traceability requirements under EN 10204 Type 3.1 inspection documents] For a Q235 Q345 A36 hot rolled carbon steel plate supplier operating as a vertically integrated mill and fabricator, every plate carries its original heat number from casting through final inspection — no middleman, no re-certification risk.
Matching Plate Grades to Structural Fabrication Demands
A Q235 Q345 A36 hot rolled carbon steel plate supplier serving EPC and fabrication clients must cover the grade spectrum from mild structural carbon to higher-strength low-alloy equivalents. Q235 maps to general building frames and non-critical connection plates where formability matters more than load capacity. Q345 steps up for primary beam-to-column joints and crane runway beams. A36 and SS400 serve North American and Japanese-spec projects respectively, avoiding the need for separate procurement streams. Our own rolling lines produce all these grades from the same slab yard, so a single purchase order covering mixed grades still traces back to one quality system and one set of mill certificates.
Engineering Compliance and Certification Pathways
Structural plates for load-bearing frames must conform to the mechanical and chemical requirements of the declared standard — GB/T 700 for Q235, GB/T 1591 for Q345, ASTM A36 for A36, and JIS G3101 for SS400. [NEED_CITE: equivalence mapping between GB, ASTM, EN, and JIS structural steel grades] For EU-bound projects, EN 1090-2 execution class requirements demand documented welding procedure qualification and material certification traceable to the original heat. Our plates ship with full chemical composition and mechanical property reports, and we accommodate SGS or BV third-party inspection at the mill before loading. The ±1% thickness tolerance across the 0.35-200mm range keeps fabrication shops within dimensional acceptance criteria for CNC cutting and automated welding setups.
Steel Grade Selection and Hot Rolling Fundamentals
The Q-series (Q195 through Q460) follows the Chinese GB system where the number after “Q” indicates minimum yield strength in MPa. Q235 remains the workhorse grade for general construction — adequate for secondary structures, platforms, and non-welded connections. Q345 delivers roughly 50% higher yield for primary frames, reducing section weight without sacrificing load capacity. A36 and SS400 serve as international equivalents for projects specifying ASTM or JIS standards, and our mill produces them on the same hot strip lines with adjusted chemistry and rolling schedules. [NEED_CITE: hot rolling process effects on microstructure and mechanical properties of carbon steel plates] The black surface from hot rolling is suitable for further coating — shot blasting and primer application proceed without additional surface preparation beyond mill scale removal. For thicknesses above 20mm, controlled rolling or normalizing may be specified to refine grain structure for improved through-thickness toughness, particularly in bridge and heavy fabrication applications.
Hidden Costs of Sourcing Plates Without Verified Certification
Plates sourced through intermediaries without original mill certificates create three categories of hidden cost. First, customs authorities in the EU and Middle East increasingly require EN 10204 Type 3.1 certificates with verifiable heat numbers — plates without them face hold or rejection at port. Second, fabrication shops discovering material mismatches during welding — such as unexpected carbon equivalent values causing cold cracking — face rework costs that far exceed the initial price savings from unverified supply. Third, structural engineers signing off on as-built documentation need full traceability; missing certificates delay project handover and final payment. [NEED_CITE: consequences of non-conforming structural steel in international construction projects]
Why Integrated Mill-and-Fabricator Supply Reduces Procurement Risk
We roll the plates ourselves on three production lines covering over 2,800 raw material specifications — there is no gap between the slab we cast and the plate you receive. Every Q235 Q345 A36 hot rolled carbon steel plate supplier claim we make is backed by our own理化实验室 testing each heat before release. Our fabrication division then cuts, drills, and welds those same plates into finished components, meaning the material certification chain never leaves our control. For projects requiring mixed grades in a single shipment — say Q345 for primary columns and Q235 for secondary bracing — we consolidate from one mill, one quality system, and one set of shipping documents. Third-party inspection by SGS or BV is arranged at our facility before loading, so buyers verify quality before the container seals.
Documentation & Compliance
- Mill Test Certificate documenting Q235/Q345/A36 chemical composition and mechanical properties per GB/T 700, GB/T 1591, or ASTM A36, traceable to original heat number
- Third-party inspection report from SGS or BV covering dimensional checks, surface quality, and witness testing at our mill
- ISO 9001 quality management certificate covering the full production chain from slab reheating through final plate inspection
- Material traceability sheet linking each plate to its heat number, rolling schedule, and test coupon location
- Export customs documentation including packing list, bill of lading, and certificate of origin for destination-country clearance
- Welding procedure specifications (WPS) and procedure qualification records (PQR) for downstream fabrication using these plate grades
Packaging, Loading & Delivery
- Plates bundled with steel strip ties and edge protectors, sized to match the 1000-2500mm width range for stable container or break-bulk loading
- Black surface plates coated with anti-rust oil on request to prevent transit corrosion during ocean shipment to humid climates
- Custom cutting to project-specific lengths within the 2000-12000mm range reduces on-site waste and fits container floor plans without overhang
- Heat number and grade stenciled on each plate edge for on-site identification and traceability verification during fabrication
- Mixed-grade orders consolidated into single shipments with separate bundle markings, simplifying customs declaration and site receiving
- FOB, CIF, and DDP terms available with professional oversized cargo loading plans for plates above 20mm thickness
Starting Your Plate Procurement with Verified Documentation
Share your project drawings, required grades (Q235, Q345, A36, SS400), thickness and quantity, and destination port — we respond within 24 hours with a quotation including material cost, processing charges, and full documentation scope. For fabrication projects, we also review shop drawings and provide material optimization suggestions before contract signing. Confirm your certification requirements (EN 1090, AWS, or project-specific specs) and we align the mill test certificate package accordingly.
Frequently Asked Questions
Q: Can you supply Q235, Q345, and A36 plates in a single shipment with separate certificates for each grade?
A: Yes. As an integrated mill and fabricator, we produce all these grades on our own rolling lines. Each grade ships with its own mill test certificate traceable to the specific heat number, and mixed-grade orders are bundled separately with clear markings.
Q: What is the thickness tolerance for your hot rolled plates?
A: Our hot rolled carbon steel plates maintain ±1% thickness tolerance across the full 0.35-200mm range, verified by ultrasonic measurement at the mill before shipment.
Q: Do you offer third-party inspection before loading?
A: Yes. We accommodate SGS, BV, or client-nominated inspectors at our facility for dimensional checks, surface inspection, and witness testing. The inspection report is included in the shipping documentation package.
Q: Can you cut plates to custom dimensions before shipping?
A: Yes. Our processing services include CNC cutting, plasma cutting, drilling, bending, and punching. Custom-cut plates ship with the same mill test certificate as the parent plate, maintaining full traceability.
Q: What surface condition do the plates arrive in?
A: Standard delivery is hot rolled black finish with mill scale. Anti-rust oil coating is available on request for ocean transit protection. Shot blasting and primer application can be arranged if required for downstream fabrication.
Get Your Q235 Q345 A36 Hot Rolled Carbon Steel Plate Quote with Full Mill Certification
Send your specifications, grade requirements, and destination port to receive a detailed quotation and sample mill test certificate within 24 hours.
Mobile/WhatsApp/WeChat: +86 188 5315 7756 | Email: admin@xjystructure.com
