Description
Factory-Direct Carbon Steel Coil Supply — Hot and cold rolled coils produced on our own lines, shipped without trading margins to 50+ countries.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Carbon Steel Coil Hot/Cold Rolled |
| Product Type | Steel Coil |
| Steel Grade | Q195, Q235, Q345 |
| Standard | AISI, ASTM, DIN, JIS, GB, SUS, EN |
| Technique | Cold Rolled / Hot Rolled |
| Thickness | 0.13–4.0 mm |
| Width | 600–3000 mm |
| Weight per Coil | 8–35 MT/Coil |
| Coil ID | 508 mm, 610 mm / According to customer requirements |
| Surface Treatment | Smooth, Patterned, Checker |
| Application | Shipping building, engineering construction, mechanical manufacturing, automotive, appliance, machinery, printing, construction, building material, bicycles, power generation, petrochemicals, pharmaceutical equipment, chemical equipment, sea water equipment, heat exchangers, condensers, pulp and paper industry, agricultural equipment, axle parts, crane booms |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Engineering Construction | Building frames, scaffolding tubes, structural purlins |
| Mechanical Manufacturing | Conveyor structures, crane booms, axle parts, machinery housings |
| Automotive & Transportation | Vehicle body panels, bicycle frames, agricultural equipment chassis |
| Petrochemical & Power | Heat exchangers, condensers, chemical storage tanks, pipeline wraps |
| Shipbuilding | Deck plating, bulkhead liners, hull structural sections |
Where Negative Tolerance on a Steel Coil Order Becomes a Structural Liability
A 0.08 mm shortfall on a 0.5 mm cold-rolled coil means 16% less load-bearing cross-section than your engineer calculated.
I once watched an entire container of 0.5 mm cold-rolled coil get rejected at destination because the buyer’s third-party gauge read 0.42 mm. The mill had pushed negative tolerance to the edge to save weight, and the structural engineer’s load table assumed nominal thickness. When you source a Custom Carbon Steel Coil Hot Cold Rolled Supplier without in-house gauge verification on every coil, you inherit that gap between mill paperwork and actual steel. [NEED_CITE: cold rolled steel thickness tolerance standards per ASTM A568]
Matching Coil Thickness and Width to Structural and Forming Demands
The 0.13–4.0 mm thickness range and 600–3000 mm width span of this Custom Carbon Steel Coil Hot Cold Rolled Supplier product line cover everything from light-gauge appliance wraps to heavy structural forming stock. Hot-rolled coils in Q345 serve crane booms and axle parts where higher yield strength matters; cold-rolled Q195 and Q235 coils feed automotive body stamping and bicycle frame tubing where surface finish and dimensional consistency take priority. Coil ID options of 508 mm and 610 mm align with standard decoiler mandrels used across Southeast Asian and Middle Eastern fabrication shops, eliminating the need for re-winding.
Engineering Compliance and Certification Pathways
For projects governed by EN 1993 or AISC design codes, the steel grade designation on the mill test certificate must trace back to a recognized national or international standard — GB/T 700 for Q235, ASTM A36 for equivalent carbon content, or EN 10025 for S-series substitution. [NEED_CITE: steel grade equivalence between GB Q235 and ASTM A36] Our in-house physical and chemical laboratory tests every heat before release, and we hold Lloyd’s Register EU CE certification (EN 10210/10219) plus Singapore FPC, which clears customs in the EU and Southeast Asia without supplementary testing delays. When your project spec calls for SGS or BV third-party inspection, we coordinate the hold point at our facility so the inspection report ships with the coil documentation.
Steel Grade Selection and Rolling Process Fundamentals
Q195 offers the lowest carbon content in this range, making it the preferred choice for deep-drawing and bending operations where cracking risk must be minimized. Q235, with its moderate carbon and manganese balance, serves general structural framing and welded assemblies. Q345 (equivalent to ASTM A572 Gr. 50 in many applications) delivers higher yield strength for crane booms, heavy axle parts, and load-bearing structural members. [NEED_CITE: mechanical property comparison of Q195 Q235 Q345 carbon steel grades]
Hot-rolled coils are produced above the recrystallization temperature, resulting in a scaled surface that is suitable for structural applications where surface appearance is secondary to thickness and strength. Cold-rolled coils undergo further reduction at room temperature, producing a smooth, oil-finished surface with tighter thickness tolerance — critical for automotive panels, appliance housings, and precision-formed components. Patterned and checker surface variants are available for flooring, stair treads, and anti-slip platforms where traction matters more than formability.
The Hidden Cost of Unverified Coil Tolerance and Missing Mill Certificates
When a coil arrives at site with thickness below the ordered nominal value, the consequences cascade: structural engineers must re-calculate load tables, fabricators discover mismatched joint clearances, and project inspectors flag the material for rejection. [NEED_CITE: consequences of negative thickness tolerance in structural steel procurement] Missing or incomplete mill test certificates cause customs holds in the EU and North America, where EN 10219 and ASTM A568 require documented chemical composition and mechanical properties before release. A Custom Carbon Steel Coil Hot Cold Rolled Supplier who cannot provide heat-number traceability shifts the entire compliance burden onto the buyer.
Why Global Buyers Source Carbon Steel Coils Through Xin Jiyuan
We operate three dedicated production lines with in-house physical and chemical laboratories, meaning every coil is gauge-verified and chemistry-tested before it leaves the facility — no third-party lab delays, no paperwork gaps. Our catalog covers 2,800+ specifications across square and rectangular tubes, round pipes, plates, coils, and section steel, so when your project needs both coil and fabricated structural members, you consolidate sourcing with one supplier instead of coordinating five. We hold 41 invention patents including proprietary sharp-corner rectangular tube technology, and our CE, ISO 9001:2015, Lloyd’s Register, and Singapore FPC certifications clear customs across 50+ export markets. Custom non-standard widths, coil IDs, and surface treatments are produced to order, and our professional loading team optimizes container stowage for heavy coil cargo to minimize freight cost per ton.
Documentation & Compliance
- Mill test certificate documenting Q195/Q235/Q345 chemical composition and mechanical properties per GB/T 700, with heat number traceability
- CE certificate per EN 10210/EN 10219 for EU market compliance on structural steel coil applications
- ISO 9001:2015 quality management system certificate covering the full cold-rolled and hot-rolled coil production process
- SGS or BV third-party inspection report available upon request, coordinated at our facility prior to shipment
- Material traceability by heat number linking each coil to its original slab chemistry and rolling schedule
- Customs document package including packing list, bill of lading, and certificate of origin for destination-country clearance
Packaging, Loading & Delivery
- Cold-rolled coils packed in seaworthy export packaging with steel strip bundling and edge protectors to preserve the smooth surface finish during ocean transit
- Hot-rolled coils bundled with anti-rust oil coating and moisture-resistant wrapping to prevent scale-related surface degradation in humid climates
- Container loading optimized for 8–35 MT coil weights, with wooden cradles and chocking to prevent coil shift during heavy-lift port handling
- Custom coil ID (508 mm or 610 mm) matched to buyer’s decoiler mandrel specification, eliminating on-site re-winding
- Heat number and steel grade stenciled on each coil ID and outer wrap for on-site identification and traceability verification
- FOB, CIF, and DDP shipping terms available with real-time tracking to ports across the EU, North America, India, Southeast Asia, and the Middle East
Getting a Coil Quote That Matches Your Project Spec
Submit your required thickness, width, steel grade, surface treatment, and destination port, and we return a detailed quotation within 12 hours — including unit price, mill test certificate availability, production lead time, and applicable certification documentation. For non-standard widths or custom coil ID requirements, we provide a technical review confirming feasibility before you commit to a deposit.
Frequently Asked Questions
Q: What is the thickness tolerance on cold-rolled Q195 and Q235 coils?
A: Cold-rolled coils in this product line are produced to standard commercial tolerance per the applicable GB, ASTM, or EN standard specified in your order. Every coil is gauge-verified in our in-house laboratory before shipment, and the mill test certificate documents the actual measured thickness.
Q: Can you supply coils with CE certification for EU projects?
A: Yes. We hold Lloyd’s Register EU CE certification per EN 10210/EN 10219, and our mill test certificates include the chemical composition and mechanical properties required for EU customs clearance and structural compliance.
Q: What is the minimum order quantity for custom-width coils?
A: MOQ depends on the specific width, thickness, and steel grade requested. Standard widths from 600–3000 mm are available from stock; non-standard widths are produced to order. Submit your specification for a confirmed MOQ and lead time.
Q: Do you provide third-party inspection before shipment?
A: Yes. We coordinate SGS or BV inspection at our facility at the pre-shipment hold point. The third-party inspection report is included in the shipping documentation package alongside the mill test certificate and bill of lading.
Q: Can hot-rolled and cold-rolled coils be loaded in the same container?
A: Yes. Our loading team optimizes container stowage for mixed coil cargo, using wooden cradles and chocking to secure both hot-rolled and cold-rolled coils and prevent surface damage or shift during transit.
[Request Your Carbon Steel Coil Quotation Today]
Send your specification — thickness, width, steel grade, surface treatment, quantity, and destination port — to receive a detailed quotation and mill test certificate sample within 12 hours.
Email: admin@sdxjysteel.com
WhatsApp / Mobile: +86 188 5315 7756
Website: www.sdxjysteel.com
