Stainless Steel Coil Tube — Whole-Coil Pricing for High-Volume Procurement
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. offers premium-grade stainless steel coil tubes (also referred to as coil tubing or coiled tube) designed for industrial and commercial applications requiring flexible, continuous-length tube delivery. Available in a range of grades including 304, 304L, 316, 316L, 321, and 310S, these coil tubes provide superior corrosion resistance, mechanical strength, and dimensional precision. The product is supplied in continuous coil form, making it ideal for automated forming, bending, and cutting operations in downstream manufacturing.
Unique Selling Points
- Whole-Coil Flat Pricing Model: Each coil is offered at a single, transparent unit price with no splitting or partial-quantity charges. This pricing structure ensures cost predictability and eliminates hidden surcharges for minimum order adjustments.
- Inventory Optimization: The whole-coil pricing approach is particularly advantageous for spot inventory clearance and end-of-run (tail coil) processing, enabling buyers to secure competitive pricing on readily available stock.
- Seamless Continuity: Coiled delivery eliminates weld joints between tube sections, reducing failure points and ensuring uniform material properties along the entire length.
- Flexible Downstream Processing: Continuous coil format facilitates automated feeding into tube-cutting, coiling, spring-forming, and bending machinery, reducing labor costs and production downtime.
- Wide Grade Selection: Multiple stainless steel grades available to match specific corrosion, temperature, and mechanical performance requirements.
Material & Properties
Stainless steel coil tubes from Wenzhou Jixing Metal Materials are manufactured from austenitic and austenitic-ferritic stainless steels, offering excellent resistance to oxidation, pitting, and crevice corrosion in a variety of environments.
- Grade 304/304L: General-purpose austenitic stainless steel with outstanding formability and corrosion resistance in atmospheric, food-grade, and chemical processing environments. 304L offers lower carbon content for superior weldability.
- Grade 316/316L: Molybdenum-enhanced austenitic grade providing enhanced resistance to pitting and crevice corrosion, particularly in chloride-containing environments and marine applications.
- Grade 321: Titanium-stabilized austenitic grade with excellent resistance to intergranular corrosion at elevated temperatures (up to 870 °C / 1,598 °F).
- Grade 310S: High-temperature austenitic grade with superior oxidation resistance and thermal stability up to 1,150 °C / 2,094 °F.
Standard surface finishes include 2B (cold-rolled and annealed), BA (bright annealed), No. 4 brushed, and polished finishes. Tubes are available in annealed (soft), pickled, or solution-annealed conditions to meet specific mechanical property requirements.
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (Coiltube) |
| Product Code | No. 188 |
| Available Grades | 304, 304L, 316, 316L, 321, 310S, 430, 2205 (duplex), custom upon request |
| Outer Diameter (OD) | 3.0 mm (0.118 in) – 50.8 mm (2.000 in) |
| Wall Thickness | 0.3 mm (0.012 in) – 3.0 mm (0.118 in) |
| Coil Length | Continuous coil, typically 500 m – 3,000 m (1,640 ft – 9,842 ft) per coil |
| Coil Inner Diameter (ID) | 100 mm – 300 mm (3.94 in – 11.81 in) |
| Surface Finish | 2B, BA, No. 4, Mirror polished, Custom |
| Mechanical Condition | Annealed (soft), Pickled, Solution-annealed, Cold-worked |
| Standards | ASTM A213, ASTM A269, ASME SA-213, EN 10216-5, GB/T 12771, JIS G3459 |
| Tolerance (OD) | ±0.05 mm to ±0.20 mm (±0.002 in – ±0.008 in) |
| Tolerance (Wall) | ±10% of nominal wall thickness |
| Pricing Model | Whole-coil flat price — no splitting; single unit price per coil |
| Supply Type | Spot inventory / End-of-run (tail coil) clearance |
| Origin | Wenzhou, Zhejiang, China |
Manufacturing Process
The production of stainless steel coil tubes at Wenzhou Jixing Metal Materials follows a rigorous, multi-stage manufacturing process to ensure consistent quality and dimensional accuracy:
- Raw Material Selection: High-quality stainless steel wire rod or strip is sourced from certified mills, with full chemical composition verification and mechanical property testing prior to acceptance.
- Coil Forming / Tube Drawing: Continuous-length stainless steel wire is drawn through precision dies and formed into seamless tube geometry using either rotary piercing or capillary drawing methods, depending on the target OD and wall thickness.
- Heat Treatment: Tubes undergo solution annealing at temperatures between 1,010 °C and 1,150 °C (1,850 °F – 2,092 °F), followed by controlled cooling, to relieve residual stresses and restore full austenitic structure.
- Pickling & Passivation: The oxide scale formed during heat treatment is removed through acid pickling (typically nitric-hydrofluoric acid blend), followed by passivation to restore the protective chromium oxide layer.
- Surface Finishing: Tubes are polished, brushed, or bright-annealed as specified, with final surface quality verified against visual and roughness standards.
- Dimensional Inspection: Each coil is inspected for OD, wall thickness, roundness, and straightness using automated laser measurement systems and manual gauging.
- Coiling & Packaging: Finished tubes are coiled onto standardized spools, wrapped in protective film or paper, and secured with steel strapping for safe transport.
Applications
Stainless steel coil tubes from Wenzhou Jixing Metal Materials serve a broad range of industrial and consumer applications:
- Automotive Industry: Exhaust systems, fuel lines, brake lines, and turbocharger tubing requiring corrosion resistance and high-temperature durability.
- Food & Beverage Processing: Hygienic fluid transfer lines, dairy equipment, brewing systems, and pharmaceutical processing where sanitary-grade surface finishes are essential.
- Heat Exchangers & Cooling Systems: Continuous coil tubes used in air conditioning coils, radiators, condensers, and industrial heat exchanger bundles.
- Spring & Coil Manufacturing: Raw material for compression springs, torsion springs, and coil-forming operations where consistent wire/tube properties are critical.
- Chemical & Petrochemical Processing: Process piping, reactor tubing, and heat-transfer elements in aggressive chemical environments.
- Medical & Dental Equipment: Tubing for surgical instruments, endoscopes, and medical device components requiring biocompatibility and sterilizability.
- Construction & Architectural: Structural tubing, railings, handrails, and decorative elements for commercial and residential applications.
- Oil & Gas Industry: Downhole tubing, wellhead assemblies, and marine offshore platforms requiring resistance to sour gas and seawater corrosion.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system and adheres to internationally recognized standards:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and process control.
- ISO 14001 — Environmental Management System certification for sustainable manufacturing practices.
- ASTM / ASME Compliance — Product testing and certification in accordance with ASTM A213, ASTM A269, and ASME SA-213 specifications.
- EN Standards — Conformance with European standards including EN 10216-5 for seamless stainless steel tubes.
- Third-Party Inspection — Available upon request: SGS, Bureau Veritas, or TÜV inspection and testing for export orders.
- Mill Test Certificates (MTC) — EN 10204 Type 3.1 certificates provided with every shipment, documenting chemical composition, mechanical properties, and heat treatment records.
- NACE MR0175 / ISO 15156 — Available for sour-service grades (316, 316L, duplex) meeting oil and gas industry requirements.
Commercial & Pricing Information
Whole-Coil Flat Pricing: All stainless steel coil tubes are offered at a single, transparent price per coil. The entire coil is sold as one unit — no splitting, no partial-quantity pricing adjustments, and no additional handling charges for coil division. This straightforward pricing model is particularly well-suited for buyers managing spot inventory clearance, end-of-run (tail coil) stock, or bulk procurement where cost certainty and supply continuity are paramount.
- Minimum Order Quantity: One full coil (length varies by specification; typical range 500 m – 3,000 m per coil).
- Pricing Basis: Per coil at a flat unit price, inclusive of material, processing, and packaging. No surcharges for splitting or partial delivery.
- Inventory Availability: Spot stock available for immediate dispatch on popular grades (304, 304L, 316, 316L). Tail-coil and clearance pricing available for end-of-production-run inventory.
- Lead Time: 3–7 business days for in-stock coils; 15–30 days for custom specifications.
- Payment Terms: T/T, L/C, or other negotiable terms based on order volume and buyer relationship.
Why Choose Wenzhou Jixing Metal Materials?
Wenzhou Jixing Metal Materials Co., Ltd. is a trusted supplier of stainless steel coil tubes, combining competitive whole-coil pricing with rigorous quality control, extensive grade availability, and flexible commercial terms. The company's commitment to transparent pricing, reliable supply, and adherence to international standards makes it an ideal procurement partner for manufacturers, distributors, and engineering firms seeking dependable stainless steel tube solutions at optimal cost.