Stainless Steel Coil Tube — LME Nickel-Linked Pricing Framework
Product Overview
The Stainless Steel Coil Tube (Product No. 194) manufactured by Wenzhou Jixing Metal Materials Co., Ltd is a precision-engineered seamless and welded tubular product supplied in continuous coil form. This product line encompasses austenitic stainless steel grades — predominantly ASTM 304 (UNS S30400) and ASTM 316L (UNS S31603) — designed for demanding industrial applications requiring high corrosion resistance, mechanical integrity, and long-term service life.
A critical distinguishing feature of this product offering is the implementation of a LME Nickel Price Tracking Mechanism (London Metal Exchange Nickel Price Tracking Mechanism). Given that nickel constitutes approximately 60% of the raw material cost for 304-grade stainless steel and 70% for 316L-grade, Wenzhou Jixing has developed a transparent, formula-based price linkage system that enables monthly or quarterly price adjustments aligned with global nickel market dynamics. This approach ensures cost transparency, risk mitigation, and fair value delivery for both the manufacturer and the end purchaser.
Material & Properties
Grade Composition
The primary material grades available include:
- 304 / 304L (UNS S30400 / S30403) — General-purpose austenitic stainless steel with 18% Cr, 8% Ni. Offers excellent weldability, formability, and moderate corrosion resistance.
- 316L (UNS S31603) — Molybdenum-enhanced austenitic stainless steel with 16–18% Cr, 10–14% Ni, and 2–3% Mo. Provides superior resistance to chlorides, pitting, and crevice corrosion.
Nickel Cost Sensitivity Analysis
Nickel is the dominant cost driver in austenitic stainless steel production. The following table illustrates the nickel cost contribution across grades:
- 304 Grade: Nickel content of 8.0% (by weight) accounts for approximately 60% of the total raw material cost.
- 316L Grade: Nickel content of 10–14% (by weight) accounts for approximately 70% of the total raw material cost.
This high nickel cost sensitivity necessitates a structured price adjustment mechanism to maintain commercial viability and supply chain stability.
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (盘管 / Coiltube) |
| Product No. | 194 |
| Available Grades | 304, 304L, 316L (ASTM / EN equivalents available) |
| Outer Diameter (OD) | 3.0 mm – 219.0 mm (customizable) |
| Wall Thickness | 0.5 mm – 12.0 mm |
| Coil Length | 50 m – 500 m per coil (standard); custom lengths available |
| Surface Finish | 2B, BA (Bright Annealed), No. 4, No. 8, Mirror (600 grit and above) |
| Tolerance (OD) | ±0.1 mm (precision grade); ±0.3 mm (standard grade) |
| Tolerance (Wall) | ±0.05 mm (precision grade); ±10% (standard grade) |
| Manufacturing Process | Seamless (hot/cold rolled) and ERW/LSAW welded |
| Standards | ASTM A213, ASTM A269, ASTM A554, EN 10216-5, EN 10217-7, GB/T 14976 |
| Pricing Mechanism | LME Nickel-Linked Formula (Monthly/Quarterly Adjustment) |
| Nickel Cost Share (304) | ~60% of total raw material cost |
| Nickel Cost Share (316L) | ~70% of total raw material cost |
| Delivery Condition | Annealed & Pickled (AP), Cold Worked (CW), Solution Heat Treated |
| Packaging | Export-standard wooden pallet / steel frame with moisture-proof wrapping |
Manufacturing Process
The production of stainless steel coil tube at Wenzhou Jixing Metal Materials Co., Ltd follows a rigorous multi-stage process:
- Raw Material Sourcing: High-purity nickel ingots and stainless steel billets/slabs are procured based on real-time LME nickel price benchmarks. Incoming materials undergo spectrographic verification (PMI — Positive Material Identification) to confirm chemical composition compliance.
- Hot Rolling / Billet Piercing: For seamless tubes, billets are heated to 1,150–1,250°C and pierced through rotary or plug mills to produce hollow rounds (HMR).
- Cold Drawing / Cold Rolling: HMRs are cold-drawn through precision dies to achieve target OD and wall thickness with tight dimensional tolerances. This step also improves surface finish and mechanical properties.
- Welding (for welded tube variants): ERW (Electric Resistance Welding) or LSAW (Longitudinal Submerged Arc Welding) processes are employed with continuous in-line quality monitoring.
- Coiling: The formed tube is wound onto precision coils with controlled tension to prevent deformation, kinking, or surface damage during winding.
- Heat Treatment: Solution annealing at 1,010–1,120°C followed by controlled cooling (air or water quench) to achieve full austenitic microstructure and optimal corrosion resistance.
- Pickling & Passivation: Acid pickling removes scale and oxide layers; passivation restores the protective chromium oxide film on the surface.
- Final Inspection: Comprehensive testing including hydrostatic pressure testing, dimensional verification (calipers, ultrasonic thickness gauges), and visual/surface inspection.
Applications
Stainless steel coil tubes are widely utilized across diverse industries due to their combination of corrosion resistance, mechanical strength, and hygienic properties:
- Food & Beverage Processing: Hygienic piping systems, heat exchangers, and process lines (304/316L with BA or No. 4 finish).
- Pharmaceutical & Biotechnology: CIP/SIP-compatible tubing for clean-in-place and steam-in-place processes.
- Chemical & Petrochemical Industry: Reactor tubing, condensers, and transfer lines handling aggressive media (316L preferred for chloride environments).
- Oil & Gas: Downhole tubing, wellhead components, and offshore platform piping.
- Automotive: Exhaust systems, fuel lines, and heat exchanger tubes.
- Architecture & Decoration: Structural railings, facade systems, and decorative elements.
- Medical Equipment: Endoscope tubing, surgical instrument handles, and implant-grade applications.
- Energy & Power Generation: Boiler tubes, superheater elements, and heat recovery systems.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management framework with the following certifications and compliance standards:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and continuous improvement.
- ISO 14001:2015 — Environmental Management System certification.
- ISO 45001:2018 — Occupational Health and Safety Management System.
- EN 10204 3.1 — Third-party inspection and certification of product conformity.
- ASTM / ASME Compliance — Products manufactured and tested in accordance with applicable American standards.
- PED (Pressure Equipment Directive 2014/68/EU) — CE marking for pressure equipment applications.
- NACE MR0175 / ISO 15156 — Compliance for sour service environments (where applicable).
- MILL TEST CERTIFICATES (MTC) — Full chemical composition and mechanical property reports provided with every shipment.
Unique Selling Points — LME Nickel-Linked Pricing Framework
The hallmark differentiator of this product offering is the LME Nickel Price Tracking and Linkage Formula (LME Nickel Price Tracking and Linkage Formula), which provides the following advantages:
- Transparency: The pricing formula is explicitly linked to the publicly available LME Nickel 3-Month Futures price, eliminating opaque cost structures and enabling buyers to independently verify pricing reasonableness.
- Cost Predictability: Monthly or quarterly adjustment cycles provide a structured cadence for price updates, allowing purchasers to plan budgets with greater confidence compared to ad-hoc or spot-market pricing.
- Risk Sharing: The formula-based approach distributes nickel price volatility risk equitably between supplier and buyer, fostering long-term commercial relationships.
- Formula Structure: The linkage formula typically takes the form: Unit Price = Base Price + (LME Nickel Price × Nickel Coefficient × Grade Multiplier), where the Nickel Coefficient reflects the grade-specific nickel weight percentage and the Grade Multiplier accounts for processing cost differentials between 304 (~60% Ni cost share) and 316L (~70% Ni cost share).
- Market Responsiveness: In periods of nickel price appreciation, the formula ensures sustainable production without margin erosion; during price declines, buyers benefit from immediate cost reductions without negotiation delays.
- Competitive Positioning: This pricing mechanism positions Wenzhou Jixing as a forward-thinking supplier that aligns commercial practices with global commodity market realities, enhancing trust and reducing procurement friction.
Conclusion
The Stainless Steel Coil Tube (Product No. 194) from Wenzhou Jixing Metal Materials Co., Ltd represents a convergence of metallurgical excellence and commercial innovation. By integrating a rigorous LME Nickel Price Tracking Mechanism into the procurement framework, the company addresses the fundamental challenge of nickel cost volatility — which drives 60–70% of raw material expenses — while maintaining uncompromising standards in material quality, dimensional precision, and international compliance. This approach ensures that customers receive a technically superior product backed by a commercially transparent and sustainable pricing model.