Description
Factory-direct cold-rolled plate supply — Every SS400 Q235B SA516 Gr70 cold-rolled high-carbon steel plate ships with original mill test certificates and ISO 9001 certified traceability from our Jinan production lines.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SS400/Q235B/SA516 Gr70 Cold-rolled High-carbon Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | SS400, Q235B, SA516 Gr70 |
| Standard | JIS G3101 (SS400), GB/T 700 (Q235B), ASTM A516 (SA516 Gr70) |
| Section Shape | Flat plate |
| Thickness | 1.0–2.0 mm |
| Technique | Cold-rolled |
| Surface Treatment | Non-oiled |
| Hardness | Full Hard |
| Application | Industrial fabrication / Pressure vessels / Structural components / Machinery parts |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Pressure vessel manufacturing | Boiler end caps, heat exchanger shells, storage tank heads per ASME code |
| General machinery | Conveyor frame side plates, gear guard panels, machine base shims |
| Structural fabrication | Bracing gussets, connection plates, stiffener ribs in building frames |
| Industrial equipment | Hopper liners, chute wear plates, silo partition walls |
Thickness Tolerance on Full-Hard Cold-Rolled Plates Determines Fabrication Fit-Up
A 0.05 mm deviation on a 1.2 mm plate means rejected weld prep and re-cutting costs on a 20-ton order.
Global buyers of SS400 Q235B SA516 Gr70 cold-rolled high-carbon steel plate frequently discover tolerance drift only after plates arrive at the fabrication shop — holes misalign, bend radii crack on full-hard material, and weld joint geometry fails inspection. When hardness is inconsistent across the coil length, CNC plasma cutters produce variable kerf widths, and downstream stamping dies wear prematurely. Missing or incomplete mill test certificates compound the problem: customs holds the container, the project timeline slips, and the buyer absorbs demurrage charges that dwarf the original price savings. [NEED_CITE: cold-rolled steel plate thickness tolerance standards for full-hard condition]
Matching Full-Hard Cold-Rolled Plate to Structural and Pressure Applications
The 1.0–2.0 mm thickness range in full-hard condition serves applications where dimensional precision and surface flatness matter more than formability. SS400 Q235B SA516 Gr70 cold-rolled high-carbon steel plate in non-oiled finish accepts direct welding, powder coating, or industrial painting without solvent degreasing — a practical advantage on high-volume fabrication lines where oil residue causes coating adhesion failures. Our production lines hold cold-rolled tolerance across the full width, so gusset plates and stiffener ribs drop into jigs without force-fitting.
Engineering Compliance and Grade Selection Across Three Standards
SA516 Gr70 plates for pressure vessel work must conform to ASTM A516 requirements for elevated-temperature service, and each heat requires traceable chemistry documentation for ASME code compliance. SS400 under JIS G3101 and Q235B under GB/T 700 serve general structural roles where yield strength classification drives member sizing. Buyers sourcing for EU markets need to verify whether CE marking under EN 10210/10219 applies to their plate fabrication scope, while projects in Southeast Asia and the Middle East typically accept JIS or GB grades with mill test certificates for customs clearance. [NEED_CITE: ASTM A516 SA516 Gr70 pressure vessel plate requirements] Non-oiled surface treatment eliminates the need for pre-weld cleaning on structural connections, reducing labor hours on site.
Cold-Rolling Process and Full-Hard Condition: What Buyers Need to Know
Cold-rolling reduces plate thickness below hot-rolled capability while improving surface finish and dimensional accuracy. In full-hard condition, the material retains maximum work-hardened strength from the reduction process — suitable for wear-resistant liners and structural shims, but unsuitable for deep drawing or tight-radius bending without intermediate annealing. The non-oiled surface means no rolling oil residue remains, which matters for applications requiring immediate painting or welding. SS400, Q235B, and SA516 Gr70 represent three distinct standard systems: JIS (Japanese), GB (Chinese national), and ASTM (American). While SS400 and Q235B share similar yield strength ranges for general structural use, SA516 Gr70 targets pressure vessel service with stricter chemistry controls and mandatory impact testing at specified temperatures. [NEED_CITE: cold-rolled full-hard steel plate mechanical behavior and formability limits]
Hidden Costs of Specifying the Wrong Grade or Accepting Incomplete Documentation
Ordering Q235B when the engineering drawing calls for SA516 Gr70 means the plate fails ASME code review — the entire batch gets rejected at the pressure vessel shop, and replacement lead time pushes the project past its commissioning window. Plates shipped without heat-number traceability cannot pass third-party inspection, and customs authorities in GCC and South American ports routinely hold steel imports lacking proper mill test certificates. [NEED_CITE: steel import documentation requirements for customs clearance] Full-hard cold-rolled plates with out-of-tolerance thickness force fabricators to either reject the material or machine it down — both options erase the cost advantage of buying direct.
Procurement Confidence from a Verified Mill Source
Every SS400 Q235B SA516 Gr70 cold-rolled high-carbon steel plate leaves our Jinan facility after three-stage in-house inspection covering thickness, surface quality, and hardness verification. We operate three production lines with monthly capacity exceeding 20,000 tons, and our inventory covers 2,800+ specifications — meaning standard sizes ship from stock while custom thickness or width orders run on dedicated schedules. Factory-direct pricing applies to all orders with no trading company margin added, and volume discount programs reward buyers who consolidate recurring procurement. Our export team handles container loading optimization for heavy plate shipments, ensuring weight distribution meets port regulations and maximizes container payload.
Documentation & Compliance
- Mill test certificate documenting SS400, Q235B, or SA516 Gr70 chemical composition and mechanical properties per JIS G3101, GB/T 700, or ASTM A516
- ISO 9001:2015 quality management certificate covering cold-rolled plate production processes
- Lloyd’s CE certificate (EN 10210/10219) for projects requiring European conformity marking
- SGS or BV third-party inspection report available upon request for pre-shipment quality verification
- Full material traceability by heat number linking each plate to its original slab and rolling record
- Export documentation package including commercial invoice, packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Cold-rolled full-hard plates bundled with steel straps and edge protectors to prevent surface scratching during transit
- Non-oiled surface plates wrapped in waterproof paper and plastic film to prevent corrosion during ocean freight
- Container loading plans optimized for 1.0–2.0 mm plate dimensions to maximize payload within weight limits
- Heat number and steel grade marked on each plate edge for on-site identification and traceability verification
- FOB, CIF, and DDP terms available with professional customs documentation for destination clearance
- Typical production lead times apply for custom orders, with standard sizes shipping from ready stock
Start Your Procurement With Complete Specifications
Submit your thickness, width, length, steel grade, and destination port requirements to receive a competitive bulk quotation with mill test certificate confirmation. Our team responds within 12 hours with pricing, delivery schedule, and documentation details for your SS400 Q235B SA516 Gr70 cold-rolled high-carbon steel plate inquiry.
Frequently Asked Questions
Q: What is the difference between SS400, Q235B, and SA516 Gr70 — and which grade suits my project?
A: SS400 (JIS G3101) and Q235B (GB/T 700) are general structural grades with similar yield strength ranges, suitable for building frames, machinery parts, and industrial fabrication. SA516 Gr70 (ASTM A516) is a pressure vessel grade designed for elevated-temperature service with stricter chemistry controls and mandatory impact testing. Choose SA516 Gr70 for boiler and pressure vessel work; SS400 or Q235B for structural and general manufacturing applications.
Q: Can you provide third-party inspection and original mill test certificates for customs clearance?
A: Yes. Every batch ships with original mill test certificates documenting chemical composition and mechanical properties. SGS or BV third-party inspection is available on request for pre-shipment verification. Complete export documentation including certificate of origin supports customs clearance in destination countries.
Q: What is the MOQ for cold-rolled high-carbon steel plates, and do you support split shipments?
A: Our flexible MOQ starts from 1 ton for trial orders. We support split shipments across multiple steel grades and thicknesses within a single container, allowing buyers to consolidate procurement from one source.
Q: How do you ensure thickness tolerance and surface quality on full-hard cold-rolled plates?
A: Our cold-rolled production lines maintain precision thickness control across the 1.0–2.0 mm range. Three-stage in-house inspection verifies dimensional accuracy, surface finish, and hardness before dispatch. Non-oiled surface treatment ensures clean plates ready for welding or coating.
Q: What are the delivery terms and typical lead time for bulk orders?
A: We offer FOB, CIF, and DDP terms. Standard sizes ship from ready stock for urgent requirements. Custom orders follow typical production lead times with real-time tracking and professional container loading optimization.
Request Your Cold-Rolled Plate Quotation Today
Send your specifications — steel grade, thickness, width, length, quantity, and destination port — to receive factory-direct pricing with mill test certificate confirmation.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxinjiyuan.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
