Description
Factory-Direct Hot Rolled Coils — Every Q235 Q345 hot rolled steel coil ships straight from our Jinan mill with in-house lab-tested mill test certificates, cutting out trader markups on heavy-gauge orders.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235 / Q345 Hot Rolled Steel Coil |
| Product Type | Steel Coil |
| Steel Grade | Q195, Q235, Q235B, Q345, Q345B, A36, SS400, St37, St37-2, St35, St35.4, St42, St52.4 |
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Thickness | 0.75–200 mm |
| Width | 600–2000 mm |
| Length | Customized |
| Coil ID | 508 / 610 mm |
| Technique | Hot Rolled |
| Surface Treatment | Hot Rolled / Coated |
| Tolerance | ±1% |
| Processing Service | Bending, Welding, Decoiling, Cutting, Punching |
| Application | Shipbuilding, Construction, Machinery, Automotive, Bridges, Pressure Vessels, Fabrication |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Shipbuilding & Offshore | Hull plating, deck structures, bulkhead frames using thick-gauge St37–St52.4 coils |
| Construction & Infrastructure | Building frames, bridge girders, rebar support structures with Q345B high-strength coils |
| Machinery Manufacturing | Crane booms, excavator frames, conveyor bases requiring precise decoiling and cutting |
| Pressure Vessel Fabrication | Storage tanks, boiler shells, heat exchanger bodies with certified Q235B / A36 material traceability |
| Automotive & Transport | Truck chassis rails, trailer floor beams, container corner castings |
Where Grade Equivalence Between GB, ASTM, and EN Decides Whether Your Shipment Clears Customs
Mismatched grade documentation is the single most common reason hot rolled coil shipments get held at destination ports.
Procurement teams ordering Q235B for projects designed to ASTM A36 or EN S235JR often discover — after the container arrives — that the mill test certificate references GB/T 700 instead of the specified standard. Customs brokers in the EU and Middle East flag this as non-conforming documentation, and the cargo sits bonded while the buyer scrambles for equivalence letters or pays for third-party re-certification. On a 200mm-thick Q345 coil destined for a bridge project, even a two-week delay means idle cranes and penalty clauses. [NEED_CITE: steel grade equivalence between EN 10025 and ASTM A36 standards]
Matching Coil Thickness and Width to Structural Load Paths
A 0.75mm Q235 coil decoiled for light-gauge purlin profiles serves a completely different load path than a 60mm Q345B plate cut for bridge girder web sections. The Q235 Q345 hot rolled steel coil range from 0.75–200mm thickness and 600–2000mm width covers both ends of that spectrum from a single mill source. Our in-house physical and chemical laboratory tests every heat for dimensional tolerance (±1%), tensile behavior, and composition before the coil leaves the line — so the Q345B you spec for a high-rise moment frame actually carries the yield class the structural engineer calculated for.
Engineering Compliance Across GB, ASTM, and EN Frameworks
Structural designs referencing EN 1993 (Eurocode 3) require material certificates conforming to EN 10025-2, while AISC-specifed projects in North America demand ASTM A36 or A572 test reports. Our Q235 Q345 hot rolled steel coil production covers GB/T 700, GB/T 1591, ASTM A36, and JIS G3101 under one roof, with mill test certificates issued per EN 10204 3.1 format. For EU-bound shipments, we arrange Lloyd’s CE verification and SGS pre-shipment inspection so the documentation package matches what the port authority expects. [NEED_CITE: EN 10204 inspection document types for steel products]
Decoding the Q-Series, S-Series, and ASTM Grade Systems
Q235 and Q235B both conform to GB/T 700, but the “B” suffix indicates impact testing at 20°C — critical for structures in cold climates. Q345B (GB/T 1591) offers higher yield strength than Q235B and roughly corresponds to ASTM A572 Gr.50 and EN S355JR in structural applications, though exact equivalence requires cross-referencing chemical composition limits and testing temperatures. The St37–St52.4 range (DIN standards) overlaps with both Q-series and S-series grades, and our mill test certificates list the actual chemical composition and mechanical results so your engineer can verify compliance rather than rely on grade-name assumptions alone. Hot rolled surface finish is standard; coated treatment options address corrosion exposure in marine or industrial environments. [NEED_CITE: comparison of structural steel grades across international standards]
The Hidden Cost of Accepting Negative Tolerance Beyond Specification
A coil ordered at 20mm thickness with ±1% tolerance should arrive between 19.8mm and 20.2mm. Some suppliers routinely ship at the lower boundary — or below it — and invoice on theoretical weight. The buyer pays for 20mm steel, receives 19.4mm material, and discovers the discrepancy only when the fabricator’s ultrasonic gauge flags the plate during bridge assembly. At that point, the structural engineer must recalculate load capacity, the contractor faces rework, and the project timeline absorbs weeks of delay. Our Q235 Q345 hot rolled steel coil shipments include dimensional inspection reports with actual measured thickness at multiple points across the coil width, verified by our in-house lab before loading. [NEED_CITE: negative tolerance practices in hot rolled steel coil trade]
Why Project Procurement Teams Source Hot Rolled Coils From Our Jinan Mill
We operate three production lines covering over 2,800 specifications, with wall thickness capability up to 40mm for heavy structural sections and coil thickness reaching 200mm for plate-type orders. Every Q235 Q345 hot rolled steel coil ships with mill test certificates generated from our own physical and chemical laboratory — not outsourced to third-party testers after the fact. Full international certifications include ISO 9001:2015, Lloyd’s CE (EN 10210/EN 10219), Singapore FPC, and SGS/BV verification. We participated in drafting China’s cold-formed steel industry standards in 2018, and our material traceability runs from heat number through final coil packaging. Custom non-standard widths, coil IDs, and cut-to-length sheets are available with MOQ as low as 1 ton for trial orders.
Documentation & Compliance
- Mill test certificate documenting Q235B / Q345B chemical composition (C, Mn, Si, S, P) and mechanical properties per GB/T 700 and GB/T 1591, formatted to EN 10204 3.1
- CE certificate per EN 10210 / EN 10219 for shipments entering EU member states, issued through Lloyd’s Register
- ISO 9001:2015 quality management certificate covering hot rolled coil production, testing, and dispatch
- SGS or BV third-party inspection report available upon request, covering dimensional verification, surface quality, and packaging condition before container sealing
- Full material traceability by heat number linking each coil to its ladle analysis, rolling schedule, and test results
- Export documentation package including commercial invoice, packing list, bill of lading, and certificate of origin for destination customs clearance
Packaging, Loading & Delivery
- Hot rolled Q235 Q345 steel coils bundled with minimum three steel strips and edge protectors to prevent edge wave damage during ocean transit, especially critical for 2000mm-width coils
- Surface protection: standard hot rolled coils shipped with mill oil coating to prevent transit rust; coated-grade coils wrapped in waterproof paper and plastic film to preserve the surface treatment
- Container loading optimized by coil weight distribution — 508mm and 610mm ID coils loaded on cradle saddles to prevent ovalization, with weight kept under 27 tons per 20ft container for heavy-gauge (over 100mm) orders
- Cut-to-length sheets from decoiled coils packed in wooden crates with interleaving paper, available for construction sites requiring ready-to-weld plates rather than coil handling
- Each coil marked with heat number, steel grade (Q235B / Q345B / A36), thickness, width, and coil weight for site identification and traceability
- Shipping terms available FOB, CIF, and DDP to 50+ countries, with professional container loading supervision to prevent shifting during voyage
Getting Your Hot Rolled Coil Inquiry Priced and Certified
Send us the steel grade, thickness, width, coil ID, quantity, and destination port — we return a detailed quotation within 12 hours including unit price, lead time, and shipping terms. If your project requires non-standard dimensions or specific surface treatment, we provide custom production options with mill test certificate samples for your engineer’s review. Third-party inspection through SGS or BV can be arranged before loading to confirm dimensional and surface compliance at the port.
Frequently Asked Questions
Q: How do Q235B, A36, and S235JR compare — can they be used interchangeably?
A: Q235B (GB/T 700), A36 (ASTM), and S235JR (EN 10025-2) share similar carbon and manganese ranges, making them broadly comparable for general structural use. However, each standard defines slightly different limits for phosphorus, sulfur, and impact testing requirements. Our mill test certificates list the actual chemical and mechanical results so your engineer can verify compliance against the specific standard referenced in your structural drawings.
Q: What is the difference between theoretical weight and actual weight, and how is negative tolerance handled?
A: Theoretical weight is calculated from nominal dimensions and standard density (7.85 g/cm³). Actual weight is measured on the scale. Our tolerance is ±1% on thickness, meaning a 20mm coil measures between 19.8mm and 20.2mm. We invoice on actual weight unless otherwise agreed, and every shipment includes a dimensional inspection report showing measured values across the coil width.
Q: Can non-standard widths or coil IDs be customized, and what is the MOQ?
A: Standard widths run 600–2000mm and coil IDs are 508mm or 610mm. Non-standard widths and special coil IDs are available through custom production. The MOQ is 1 ton, which applies to both standard stock and custom orders.
Q: Which surface treatment options are available for hot rolled coils?
A: Standard hot rolled coils ship with mill oil to prevent transit corrosion. For applications requiring enhanced corrosion resistance, coated treatment options are available. Pickled and oiled (PO) finish can also be specified for improved surface quality before further processing such as cold rolling or galvanizing.
Q: How are hot rolled steel coils packed and loaded to prevent edge damage during ocean freight?
A: Coils are bundled with at least three steel strips and fitted with edge protectors. For wide coils (over 1500mm), additional edge guards are applied. Coils are loaded on cradle saddles inside the container to prevent ovalization, and weight is distributed to stay within container limits. Waterproof wrapping is applied for coated-grade coils.
Request Your Q235 Q345 Hot Rolled Steel Coil Quote With Mill Test Certificates
Submit your grade, thickness, width, quantity, and destination port to receive a detailed quotation and sample mill test certificate within 12 hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjypipe.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjypipe.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
