Description
Factory-Direct Bulk Supply — Every SS400, Q235, and Q345 hot rolled carbon steel plate ships with original mill test certificates and full heat-number traceability, cutting out middlemen to deliver volume pricing on tear drop checker plate orders.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SS400 / Q235 / Q345 Hot Rolled Carbon Steel Plate |
| Product Type | Steel Plate |
| Steel Grade | SS400, Q235, Q345 |
| Standard | JIS G3101 (SS400), GB/T 700 (Q235), GB/T 1591 (Q345) |
| Section Shape | Flat Plate |
| Thickness | 1.2 mm – 2.0 mm |
| Technique | Hot Rolled |
| Surface Treatment | Tear Drop (Checker Plate) |
| Origin | China |
| Application | Industrial flooring, building structures, machinery bases, stair treads, platform decking |
| MOQ | 1 Ton |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Stair treads, walkway platforms, scaffolding decking for site access |
| Industrial Manufacturing | Machinery base plates, equipment support frames, factory floor grating |
| Commercial Building | Anti-slip flooring in loading bays, mezzanine platforms, warehouse catwalks |
| EPC Projects | Modular platform decking for oil & gas and power plant maintenance access |
Why Material Traceability Decides Whether Your Checker Plate Clears Customs
A missing heat number on a mill test certificate can hold an entire container at port for weeks.
When importing hot rolled carbon steel plate for industrial flooring or platform decking, customs authorities in many markets require original mill test certificates that match the physical cargo — heat number by heat number, plate by plate. Buyers who source from fragmented suppliers often discover that certificates were copied from different batches, or that the steel grade stamped on the plate does not match the chemistry reported on the paperwork. The result is customs holds, SGS re-inspection costs, and project delays that no amount of price savings can offset.
Sourcing from a single high-volume SS400 Q235 Q345 hot rolled carbon steel plate supplier with in-house quality control and third-party inspection capability eliminates this gap entirely [NEED_CITE: steel plate import documentation requirements for customs clearance].
How Tear Drop Checker Plate Matches Industrial Flooring Demands
The tear drop surface pattern formed during hot rolling creates a raised, slip-resistant profile that meets the functional requirements of industrial flooring, platform decking, and stair treads without additional anti-slip treatment. At 1.2 mm to 2.0 mm thickness, these plates serve light-duty structural and walking surface applications where full heavy-gauge plate would be over-specified. The hot rolled process ensures uniform mechanical properties across the sheet, providing consistent weldability for on-site fabrication into platform modules or machinery bases. As a bulk SS400 Q235 Q345 hot rolled carbon steel plate supplier, we maintain ready stock across all three grades so that project buyers can consolidate flooring, stair, and platform requirements into a single shipment.
Engineering Compliance and Grade Selection for Structural Applications
For platform decking and industrial flooring, the structural design typically follows national or international building codes that specify minimum yield strength requirements for walking surfaces and light structural members. SS400 per JIS G3101 is widely accepted across Southeast Asian and Middle Eastern projects, while Q235 and Q345 per Chinese GB standards dominate African and South American EPC specifications [NEED_CITE: steel grade equivalence between JIS GB and ASTM systems for structural plate]. The tear drop checker plate surface does not affect structural calculations but must be accounted for in weight estimation and load planning. Third-party inspection by SGS or BV confirms both chemical composition and dimensional tolerance before shipment, ensuring compliance with project specifications and import regulations.
Steel Grade and Hot Rolling Process Explained
SS400, Q235, and Q345 represent three distinct strength tiers across different national standard systems. SS400 is a general structural grade under JIS G3101, suitable for non-critical structural members and flooring where moderate strength is required. Q235, governed by GB/T 700, offers comparable performance and is the most widely specified mild steel grade in Chinese-standard projects. Q345 per GB/T 1591 provides higher yield strength, making it the preferred choice for load-bearing platform structures and machinery bases where deflection limits are tighter.
The hot rolling process heats steel slabs above recrystallization temperature and passes them through rollers to achieve the target thickness. This produces a mill scale surface that, when combined with the tear drop pattern, creates the characteristic checker plate profile. Hot rolling ensures through-thickness grain uniformity, which directly supports weldability and formability during on-site fabrication. The 1.2 mm to 2.0 mm thickness range is achieved through controlled rolling passes and is suitable for applications where weight reduction matters but structural integrity must be maintained.
Hidden Costs of Sourcing the Wrong Grade or Unverified Material
Ordering Q345 plate but receiving Q235 material — a scenario I have witnessed firsthand on West African project sites — means the flooring will not meet the structural engineer’s load calculations. The plate may pass visual inspection but will fail mechanical testing, forcing complete replacement at a cost far exceeding the original price difference. Similarly, plates with excessive negative tolerance reduce actual load-bearing capacity below design specifications, creating safety risks that only surface during structural audits or, worse, after installation failure. Missing or mismatched mill test certificates trigger customs rejections and third-party re-inspection fees that can exceed the material cost itself [NEED_CITE: consequences of steel grade mismatch in structural applications].
Why Bulk Buyers Choose Us as Their SS400 Q235 Q345 Hot Rolled Carbon Steel Plate Supplier
We operate three production lines with monthly capacity exceeding 20,000 tons, allowing us to fulfill both trial orders and full-container bulk shipments from ready stock or scheduled production runs. Every plate we supply carries an original mill test certificate with full heat-number traceability from slab to finished product — a practice I insisted on after seeing entire shipments rejected due to grade substitution. Our in-house laboratory conducts three-stage inspection covering chemical composition, dimensional tolerance, and surface quality. For buyers requiring independent verification, we arrange SGS or BV third-party inspection at the mill before container loading. Our professional export team handles documentation, customs clearance paperwork, and container loading optimization to maximize payload per shipment. Volume-based discount programs reward long-term procurement partners with pricing that improves as order frequency increases.
Documentation & Compliance
- Mill test certificate documenting SS400, Q235, or Q345 chemical composition and mechanical properties per JIS G3101 or GB/T 700/1591, with heat number traceability
- ISO 9001:2015 quality management system certificate covering the full production and inspection process
- SGS or BV third-party inspection report available upon request, confirming grade, thickness, and surface quality before shipment
- Material traceability documentation linking each plate to its original heat number and rolling batch
- Complete customs documentation package including packing list, bill of lading, and certificate of origin
- CE marking documentation available for projects requiring European market compliance
Packaging, Loading & Delivery
- Tear drop checker plates bundled with steel strips and edge protectors to prevent surface damage to the raised pattern during transit
- Anti-rust oil applied to plate surfaces before bundling to preserve the hot rolled finish during ocean shipping
- Container loading plans optimized for 1.2 mm to 2.0 mm thickness plates to maximize payload while maintaining weight distribution
- Heat number and steel grade stenciled on each bundle for on-site identification and traceability verification
- Cut-to-size service available for buyers requiring specific dimensions beyond standard mill lengths
- FOB, CIF, and DDP shipping terms supported with professional export documentation handling
How to Initiate Your Bulk Plate Procurement
Submit your specifications including steel grade, thickness, quantity, and destination port via email or WhatsApp to receive a competitive bulk quotation within 12 hours. We will provide the corresponding mill test certificate format and confirm third-party inspection availability before production begins. For non-standard dimensions or mixed-grade container orders, our team will prepare a consolidated loading plan and delivery schedule.
Request Your SS400 Q235 Q345 Hot Rolled Carbon Steel Plate Quote Today
Send your specifications and quantity requirements to receive factory-direct pricing with full mill test certification.
Company: 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
Frequently Asked Questions
Q: What is the difference between SS400, Q235, and Q345 steel grades for checker plate applications?
A: SS400 is a Japanese standard general structural grade under JIS G3101, Q235 is a Chinese mild steel grade per GB/T 700 with comparable performance, and Q345 is a higher-strength Chinese grade per GB/T 1591 offering greater yield strength for load-bearing applications. For industrial flooring and platform decking, SS400 and Q235 are typically sufficient, while Q345 is preferred for machinery bases and structural platforms requiring tighter deflection control.
Q: Can you provide mill test certificates for every batch of hot rolled carbon steel plate?
A: Yes, every batch of SS400, Q235, and Q345 hot rolled carbon steel plate we supply comes with an original mill test certificate documenting chemical composition and mechanical properties, with full heat-number traceability from slab to finished plate.
Q: Do you offer third-party inspection for steel plate orders?
A: Yes, we arrange SGS or BV third-party inspection at the mill upon request. The inspection covers chemical composition verification, dimensional tolerance measurement, and surface quality assessment before container loading.
Q: What is the minimum order quantity for tear drop checker plate?
A: The minimum order quantity is 1 ton, supporting both trial orders and full-container bulk shipments. We maintain ready stock in standard thicknesses from 1.2 mm to 2.0 mm for rapid fulfillment.
Q: Can you supply non-standard thickness or cut-to-size plates?
A: Yes, we offer cut-to-size service for buyers requiring specific dimensions beyond standard mill sizes. Custom thickness orders are available with typical production lead times of 15 to 25 days depending on specifications and quantity.
