Description
Direct Mill Supply — Vertically integrated production from raw slab to finished cold-rolled plate
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SS400 / Q235B / SA516 Gr70 Cold-rolled High-carbon Steel Plates |
| Product Type | Steel Plate |
| Steel Grade | SS400, Q235B, SA516 Gr70 |
| Standard | JIS G3101 (SS400), GB/T 700 (Q235B), ASTM A516 (SA516 Gr70) |
| Thickness | 1.0 mm – 2.0 mm |
| Technique | Cold-rolled |
| Surface Treatment | Non-oiled |
| Hardness | Full Hard |
| Application | Industrial fabrication, Pressure vessels, Structural components, Heavy-duty machinery parts |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Pressure Vessel Manufacturing | Boiler shells, heat exchanger end caps, reactor vessel bodies per ASTM A516 requirements |
| Industrial Machinery | Machine base frames, conveyor roller housings, gear guard panels requiring wear resistance |
| Structural Steel Fabrication | Connection gusset plates, bracket stiffeners, column base plates for building frames |
| EPC & Infrastructure Projects | Platform grating supports, pipe rack clamps, equipment skid base plates |
Where Material Traceability Breaks Down on Cold-rolled Plate Orders
Single-source mill control eliminates the gap between raw steel and finished plate.
When procurement teams source cold-rolled high-carbon steel plates from trading companies or third-party processors, chemical composition reports often trace back to unknown slab heats. I once shipped a batch of SA516 Gr70 plates for pressure vessel fabrication — the buyer’s third-party re-inspection flagged carbon content below Gr70 minimum, forcing the entire lot to be downgraded to Gr.60. The re-rolling cost was absorbable; the ocean freight for the rejected container was not. That kind of traceability gap does not show up until the material reaches the buyer’s port.
Sourcing a SA516 Gr70 cold-rolled high-carbon steel plate from a vertically integrated mill means every heat number on the mill test certificate links directly to our own steelmaking records — no intermediate sourcing, no documentation hand-offs, no ambiguity when customs or end-client inspectors request traceability proof. [NEED_CITE: material traceability requirements for pressure vessel steel per ASME Section II]
How Full Hard Cold-rolled Condition Meets Wear-Critical Engineering Demands
Cold-rolled plates in full hard condition retain maximum hardness from the rolling reduction process, making them suitable for heavy-duty machinery parts and structural components where surface wear resistance matters more than formability. The non-oiled surface eliminates contamination risk for applications requiring subsequent welding or coating without pre-cleaning. At 1.0–2.0 mm thickness, these plates serve as stiffener elements, gusset connections, and machinery guards where dimensional precision from cold reduction ensures consistent fit-up during assembly. When EPC firms specify a SA516 Gr70 cold-rolled high-carbon steel plate for pressure vessel end caps, the full hard condition provides the baseline hardness that post-fabrication heat treatment can further refine.
Compliance Pathways Across JIS, GB, and ASTM Standards
Engineering specifications for cold-rolled plate often reference different national standards depending on the project location — JIS G3101 for SS400 in Southeast Asian infrastructure, GB/T 700 for Q235B in domestic Chinese EPC packages, and ASTM A516 for SA516 Gr70 in Middle Eastern and African pressure vessel contracts. Each standard defines its own chemical composition ranges and testing protocols, and cross-referencing between them requires careful comparison rather than assumption of equivalence. For EU-bound projects, EN 1090 fabrication standards demand full material certification traceable to the production heat, while AISC-compliant projects in the Americas require ASTM-specific mill test reports with supplementary testing as specified. [NEED_CITE: steel grade equivalence tables between JIS SS400 and GB Q235B] Our engineering team reviews shop drawings against the specified standard before production begins, ensuring the correct grade is rolled and documented from the start.
Understanding Cold-rolled vs. Hot-rolled for Plate Selection
The cold-rolling process passes hot-rolled coil through reduction stands at room temperature, producing tighter thickness tolerances, smoother surface finish, and higher strength through strain hardening. For a SA516 Gr70 cold-rolled high-carbon steel plate at 1.0–2.0 mm, this means the dimensional accuracy required for precision-machined pressure vessel components or CNC-cut structural gussets. Full hard condition indicates the plate has not undergone annealing after cold reduction — the trade-off is higher hardness and wear resistance at the expense of reduced ductility for cold forming. Non-oiled surface treatment is specified when the end application involves welding, painting, or coating where oil residue would cause adhesion failure or weld porosity. Hot-rolled plates, by contrast, offer better formability for deep-drawn components but carry wider thickness tolerances and mill scale that requires blasting before coating. [NEED_CITE: cold rolling reduction effects on mechanical properties of carbon steel plate]
Hidden Costs When Plate Chemistry Does Not Match the Heat Number
Ordering a SA516 Gr70 cold-rolled high-carbon steel plate based on a trader’s generic certificate — rather than a heat-specific mill test report — exposes the project to chemistry mismatches that only surface during fabrication or third-party inspection. Carbon content below the Gr70 minimum reclassifies the material to Gr.60, which may not satisfy the design pressure calculation for the vessel. Manganese and silicon deviations affect weldability and heat treatment response. When customs authorities at the destination port request original mill documentation linking heat numbers to chemical composition, gaps in the traceability chain can delay clearance for weeks. The cost of re-rolling and re-shipping always exceeds the cost of sourcing from an integrated mill with complete documentation from slab to finished plate. [NEED_CITE: ASTM A516 chemical composition requirements and grade classification]
Why Integrated Mill-to-Fabrication Sourcing Reduces Procurement Risk
Our own steel production facility operates three melting and rolling lines with over 2,800 specifications in active inventory, meaning the SA516 Gr70 cold-rolled high-carbon steel plate you order is produced, cold-rolled, and inspected under a single quality management system. Every plate carries a heat number traceable to our ladle analysis records — there is no intermediary sourcing point where documentation can be lost or substituted. Our fabrication division provides CNC cutting, drilling, and edge preparation to engineering drawings, so the plate arrives at your site as a finished component rather than raw material requiring secondary processing. Certified welding procedures (WPS/PQR) and qualified welders (AWS/EN certified) ensure that any fabrication performed in-house meets international code requirements. We have delivered pressure vessel plates and structural components to projects across the EU, Middle East, Southeast Asia, and Africa — each shipment accompanied by a complete quality documentation package including mill test certificates, dimensional inspection reports, and coating specifications.
Documentation & Compliance
- Mill test certificate documenting SA516 Gr70 chemical composition (C, Mn, Si, P, S) and tensile properties per ASTM A516, traceable to production heat number
- EN 10204 3.1 / 3.2 certification format available for EU pressure vessel and structural steel projects requiring independent inspection verification
- Third-party inspection reports from SGS, BV, or TÜV covering dimensional checks, surface quality, and ultrasonic testing as specified in purchase order
- Material traceability sheet linking each plate to its heat number, ladle analysis, cold-rolling reduction pass, and final inspection lot
- Export customs documentation including packing list, bill of lading, and certificate of origin formatted for destination-country clearance requirements
- Welding procedure specifications (WPS) and procedure qualification records (PQR) for any fabrication services performed on SA516 Gr70 or SS400 plates
Packaging, Loading & Delivery
- Cold-rolled full hard plates bundled with steel strapping and edge protectors to prevent surface scratching and edge damage during ocean transit
- Non-oiled surface plates wrapped in waterproof paper and plastic film to prevent moisture contact without introducing oil contamination before welding or coating
- Thickness-specific stacking with interleaving separators for 1.0 mm and 1.5 mm plates to prevent surface marking under bundle weight
- Heat number and grade identification stenciled on each bundle for on-site traceability verification upon arrival
- Container loading plans optimized for 1.0–2.0 mm plate dimensions to maximize payload within 20ft and 40ft standard shipping containers
- FOB, CIF, and DDP delivery terms available with professional oversized cargo loading and lashing for project-sized shipments
How to Initiate a Cold-rolled Plate Inquiry for Your Project
Share your project drawings (PDF or DWG format), required steel grade (SS400, Q235B, or SA516 Gr70), thickness specifications, quantity, and destination port. Our engineering team responds within 24 hours with a preliminary assessment including shop drawing review, material optimization recommendations, and a detailed quotation covering material, cold-rolling, cutting, and shipping costs. We confirm production scheduling and mill test certificate availability before contract execution.
Request Your SA516 Gr70 Cold-rolled Plate Quotation with Mill Test Certification
Submit your specifications, steel grade, and quantity to receive a detailed quotation with complete mill test documentation.
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
