Description
Factory-Direct Bulk Supply — Three production lines running simultaneously with 20,000+ tons monthly capacity, covering S235JR, S355JR, Q235B, SS400, and ASTM A36 hot rolled carbon steel coil in ready stock for traders and project buyers.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | S235JR / S355JR / Q235B / SS400 / ASTM A36 Hot Rolled Carbon Steel Coil |
| Product Type | Steel Coil / Plate |
| Steel Grade | S235JR, S355JR, SAE1006, Q235B, SS400, ASTM A36, Q195–Q345 |
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Section Shape | Coil / Plate |
| Thickness | 2.0 mm – 25 mm |
| Width | 600 mm – 1500 mm |
| Technique | Hot Rolled |
| Surface Treatment | Dull finish / Oiled |
| Tolerance | ±1% |
| Processing Service | Welding, Punching, Cutting, Bending, Decoiling |
| Packing | Standard seaworthy packing (plastic film + waterproof paper + steel strips, one coil per pallet) |
| Application | Shipbuilding, Boiler, Container, Pipe making, Cold rolled feedstock, Construction, Transport, Gas containers |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Pipe Manufacturing | ERW and SSAW mill feedstock for structural and fluid transport pipes |
| Shipbuilding & Pressure Vessel | Hull plating, deck structures, boiler shells, gas container bodies |
| Construction & Infrastructure | Building frames, bridge girders, scaffolding components, transport trailer chassis |
| Cold Rolling Feedstock | Input material for cold reduced sheet used in appliance panels and automotive parts |
| General Fabrication | Small tool blanks, machinery base plates, warehouse racking uprights |
What Thickness Tolerance Costs When You Buy Hot Rolled Carbon Steel Coil by Theoretical Weight
A ±1% tolerance on a 25mm S355JR coil can mean the difference between a clean project margin and a two-ton shortfall at the destination port.
I learned this the hard way years ago — a Middle East buyer received a shipment of Q235B hot rolled coil where the negative tolerance had crept past acceptable limits. When they weighed the coils at destination, the entire container was nearly two tons light. Reshipping replacement material, absorbing freight penalties, and explaining the shortage to their end client took months. Since then, every coil I handle gets checked for actual thickness with ultrasonic gauges and verified against gross weight before loading. Global steel buyers continue to lose money on fragmented sourcing where the supplier ships theoretical weight but the coils arrive under gauge, and no mill test certificate backs the actual measurement [NEED_CITE: hot rolled steel coil thickness tolerance standards and weight verification practices].
Matching Coil Thickness and Width to Pipe Mill and Structural Fabrication Needs
When an ERW pipe mill orders S235JR or SS400 hot rolled carbon steel coil as feedstock, the width must align precisely with the pipe diameter and weld seam geometry — a 600mm coil for small-bore structural tubes, a 1500mm coil for large-diameter SSAW pipe. Our production lines slit and decoil to the exact width the buyer specifies, eliminating the waste of purchasing standard mill widths and paying for scrap. For shipbuilding and pressure vessel applications, S355JR coil at 8–20mm thickness provides the higher yield strength needed for hull and boiler plate without requiring secondary heat treatment, and every batch ships with original mill test certificates documenting chemical composition per EN and GB standards.
Engineering Compliance Across EN, ASTM, GB, and JIS Standards
Structural engineers specifying S235JR under EN 10025-2 need documentation that matches the standard exactly — not a generic “mild steel” label. The same applies to ASTM A36 for North American projects, SS400 under JIS G 3101 for Japanese-spec work, and Q235B under GB/T 700 for domestic Chinese standard projects shipped overseas. Each steel grade system has distinct requirements for chemical composition limits, tensile properties, and impact testing temperatures. Third-party inspection by SGS or BV verifies that the material shipped conforms to the specified standard before the container is sealed [NEED_CITE: steel grade equivalence and compliance requirements between EN ASTM GB JIS standards]. For projects requiring CE marking under EN 10210 or EN 10219, the mill test certificate must include Factory Production Control traceability — something that generic trading companies cannot provide.
Understanding the S-Series, Q-Series, and ASTM Grade Systems in Hot Rolled Coil
S235JR and S355JR follow the European EN 10025 designation where the number indicates minimum yield strength in MPa for thickness up to 16mm — S355JR delivers higher load-bearing capacity than S235JR, making it the preferred choice for heavier structural frames and bridge components. The Q-series (Q235B, Q345) follows the Chinese GB/T 700 standard where “Q” denotes yield strength and the suffix indicates quality grade and impact test requirements. ASTM A36 serves the North American market with its own carbon and manganese ranges. SAE1006 targets the low-carbon end for deep drawing and cold rolling feedstock. All these grades are available in hot rolled coil form from our mill, with the oiled surface treatment preventing rust during ocean transit without interfering with downstream welding or painting processes. The ±1% thickness tolerance ensures that structural calculations based on design thickness remain valid — critical when engineers size members assuming full-section properties [NEED_CITE: hot rolled carbon steel grade comparison across EN ASTM GB standards].
The Hidden Cost of Buying S235JR S355JR Hot Rolled Carbon Steel Coil Without Verified Certification
Material that arrives without a valid mill test certificate, or with certificates that do not match the heat number stamped on each coil, creates cascading failures: customs authorities hold the shipment, the project inspector rejects the material, and the buyer faces re-procurement delays that push out entire construction schedules. Steel grade substitution — receiving Q235B when S355JR was specified — may pass visual inspection but fails under structural load verification, creating safety liability that no amount of cost savings can justify [NEED_CITE: consequences of non-compliant steel material in structural engineering projects]. Working with a factory-direct supplier that provides original mill test certificates, supports SGS/BV third-party inspection, and maintains heat number traceability from slab to finished coil eliminates every one of these risks.
Procuring Direct From a Mill With Three Production Lines and Full Documentation
Our Jinan facility operates three hot rolling lines producing over 20,000 tons monthly across 2,800+ specifications — meaning S235JR, S355JR, Q235B, SS400, and ASTM A36 hot rolled carbon steel coil in both standard and custom widths is available from ready stock or produced to order within typical lead times. Every coil carries an original mill test certificate showing chemical composition and mechanical properties, and we arrange SGS or BV third-party inspection at the buyer’s request before loading. Factory-direct pricing with no trading company margin applies to both trial orders of 1 ton and full-container bulk purchases. Our export team handles container loading optimization — critical when shipping heavy steel coil where improper weight distribution can damage the container floor or exceed port crane limits — and provides complete customs documentation including packing list, bill of lading, and certificate of origin.
Documentation & Compliance
- Mill test certificate documenting S235JR / S355JR / Q235B / SS400 / ASTM A36 chemical composition and mechanical properties per EN 10025, GB/T 700, JIS G 3101, or ASTM A36 as specified
- CE certificate and Factory Production Control documentation for projects requiring EN 10210 / EN 10219 compliance in European markets
- ISO 9001:2015 quality management certificate covering the full hot rolled coil production and inspection process
- SGS or BV third-party inspection report verifying thickness, width, surface condition, and grade conformance before container sealing
- Heat number traceability from slab to finished coil, stamped on each coil and cross-referenced in the mill test certificate
- Complete export customs documentation including packing list, bill of lading, certificate of origin, and commercial invoice
Packaging, Loading & Delivery
- Each S235JR / S355JR / Q235B hot rolled carbon steel coil packed individually with plastic film inner layer, waterproof paper middle layer, and outer steel strip binding on a wooden pallet to prevent edge damage and moisture ingress during ocean transit
- Oiled surface treatment applied at the mill protects the dull finish from atmospheric corrosion during shipping without affecting weldability or paint adhesion at the destination
- Container loading plans optimized by our export team based on coil weight and diameter — a 1500mm wide coil at 20mm thickness requires careful weight distribution to stay within container payload limits
- Cut-to-length and decoiling service available before shipment for buyers who need plate rather than coil format, reducing secondary processing costs at the fabrication yard
- Heat number, steel grade, thickness, width, and production date marked on each coil and on the outer packing for easy identification during unloading and inventory management
- FOB, CIF, and DDP shipping terms available with real-time tracking from Jinan inland depot through Qingdao port to destination
Requesting a Quote With Mill Test Certificates and Loading Plans
Submit your required steel grade, thickness, width, quantity, and destination port — we respond within 12 hours with factory-direct pricing, available stock status or production lead time, and a preliminary container loading plan. For non-standard widths or custom cut-to-length requirements, share your fabrication drawing and we will confirm feasibility and MOQ. All quotes include mill test certificate provision and the option to add SGS or BV third-party inspection before shipment.
Frequently Asked Questions
Q: What is the difference between S235JR, ASTM A36, Q235B, and SS400 — can they be substituted for each other?
A: These grades belong to different standard systems (EN, ASTM, GB, JIS) with similar but not identical chemical composition and mechanical property ranges. S235JR and ASTM A36 are often considered roughly equivalent for general structural use, but they are not formally interchangeable without engineering approval. We supply all four grades and can provide mill test certificates showing the actual test results so your engineer can verify compliance with the specified standard.
Q: How do you verify the thickness and quality of each hot rolled carbon steel coil before shipment?
A: Every coil undergoes three-stage in-house inspection covering thickness measurement with ultrasonic gauges, width verification, and surface condition check. Original mill test certificates accompany each batch. SGS or BV third-party inspection is available on request to independently verify dimensions, grade conformance, and surface quality before the container is sealed.
Q: Can you supply custom widths or cut-to-length plates from hot rolled coil?
A: Yes. Our processing services include slitting to custom widths within the 600–1500mm range, cut-to-length plate production, decoiling, bending, punching, and welding. Share your required dimensions and quantity, and we will confirm feasibility, MOQ, and lead time.
Q: What is the minimum order quantity for S235JR S355JR hot rolled carbon steel coil?
A: The MOQ is 1 ton, supporting both trial orders for new buyers and full-container bulk shipments for established trading partners. Volume-based discount programs apply for recurring orders.
Q: How do you handle export packing and container loading for heavy steel coil?
A: Each coil is packed on a wooden pallet with plastic film, waterproof paper, and steel strip binding. Our export team prepares container loading plans based on coil weight and dimensions to ensure safe weight distribution and maximum container utilization. FOB, CIF, and DDP terms are available.
Secure Factory-Direct Pricing With Full Mill Documentation
Send your specifications — steel grade, thickness, width, quantity, and destination — to receive a bulk quote with mill test certificates and container loading plans within 12 hours.
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
