Stainless Steel Coil Tube — Transparent Alloy-Linked Pricing Program
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. offers a comprehensive range of cold-rolled and cold-drawn stainless steel coil tubes engineered for demanding industrial applications. This product line encompasses austenitic, duplex, and super-austenitic grades, supplied in continuous coil form for maximum downstream processing efficiency. A defining feature of this offering is the company's Ni/Mo/Cr Linked Price Adjustment Mechanism — a transparent, formula-driven pricing framework that protects both buyer and seller against the volatility of the global nickel, molybdenum, and chromium markets.
Material & Properties
The coil tube product line is manufactured from high-purity stainless steel alloys, with the most common grades including:
- 304 / 304L — General-purpose austenitic with excellent formability and corrosion resistance
- 316 / 316L — Molybdenum-enhanced austenitic for superior chloride pitting resistance
- 321 / 347 — Stabilized grades for elevated-temperature service
- 904L — High-alloy super-austenitic for aggressive chemical environments
- 2205 Duplex — Combined strength and corrosion performance for pressure-vessel applications
Each alloy composition is certified to ASTM, EN, JIS, and GB standards. The material exhibits non-magnetic austenitic structure (except duplex grades), low carbon content in the "L" variants to prevent sensitization, and mechanical properties verified through tensile, hardness, and impact testing at every production batch.
Specifications
| Parameter | Range / Detail |
|---|---|
| Outer Diameter (OD) | Φ3.0 mm – Φ108 mm |
| Wall Thickness | 0.2 mm – 6.0 mm |
| Coil Weight | Up to 2,000 kg per coil (standard); custom on request |
| Surface Finish | No. 1, 2B, BA, No. 4, HL, Mirror (custom available) |
| Tolerance (OD) | ±0.05 mm – ±0.15 mm (per GB/T 14976 / ASTM A554) |
| Tolerance (WT) | ±10% of nominal wall thickness |
| Manufacturing Method | Seamless (hot/cold rolled) or Welded (ERW/AW) |
| Standard References | ASTM A511, ASTM A554, GB/T 14976, EN 10216-5 |
| Delivery Condition | Annealed, pickled, or solution-annealed |
Manufacturing Process
Production follows a rigorous multi-stage process to ensure dimensional accuracy, microstructural integrity, and surface quality:
- Slab Casting & Hot Rolling — High-purity billets are cast via EAF or AOD route, then hot-rolled into seamless tube blanks or cold-rolled strip for welded tube production.
- Forming — Blanks are pierced and drawn (seamless) or strip is formed and welded (ERW/autogenous) to achieve the target OD and wall thickness.
- Cold Reduction — Multi-pass cold drawing or rolling refines dimensions to tight tolerances and enhances mechanical properties through controlled work hardening.
- Solution Annealing — Tubes are heated to 1,010–1,150 °C and rapidly quenched to restore full austenitic structure and maximize corrosion resistance.
- Pickling & Descaling — Chemical pickling removes oxide scale, yielding a clean, uniform surface ready for finishing.
- Surface Finishing — Electropolishing, mechanical polishing, or passivation is applied as specified.
- Coiling & Packaging — Finished tube is coiled onto steel cores, wrapped in protective film, and packed for shipment.
Pricing Transparency: Ni/Mo/Cr Linked Adjustment Mechanism
A unique differentiator of the Wenzhou Jixing procurement program is its alloy-linked price adjustment formula, designed to provide cost certainty in a volatile metals market:
- Base Price Lock — At contract signing, a base price is locked for the agreed order quantity, ensuring initial cost certainty.
- Alloy Surcharge Formula — The final unit price incorporates an additive surcharge calculated from the monthly average of LME (London Metal Exchange) futures for nickel (Ni), molybdenum (Mo), and chromium (Cr), weighted according to the specific alloy grade.
- Monthly Recalculation — The surcharge is recalculated each month based on published LME settlement data, ensuring that price movements in raw alloy costs are passed through transparently and without arbitrary markup.
- Formula Transparency — The exact weighting coefficients and calculation methodology are disclosed in the contract, eliminating disputes and building long-term trust between buyer and supplier.
Example Formula Structure: Final Price = Locked Base Price + (Ni_LME_Monthly_Avg × W_Ni × Ni_Coeff) + (Mo_LME_Monthly_Avg × W_Mo × Mo_Coeff) + (Cr_LME_Monthly_Avg × W_Cr × Cr_Coeff) + Processing Margin
This mechanism shields buyers from sudden, unexplained price escalations while ensuring the supplier can sustain production quality through periods of elevated alloy costs — a win-win framework for long-term supply chain partners.
Applications
Stainless steel coil tubes from this program are deployed across a wide spectrum of industries:
- Heat Exchangers & Boilers — Coil tubes for shell-and-tube, plate, and air-cooled heat exchangers in power generation and petrochemical refining.
- Chemical Processing — Reactor internals, distillation columns, and piping in acid, alkali, and halide-containing environments.
- Food & Beverage — Hygienic-grade coil tube for dairy processing, brewing, and pharmaceutical equipment (316L, electropolished).
- Oil & Gas — Downhole tubing, wellhead assemblies, and offshore platform piping in corrosive sour-service conditions.
- Architecture & Decoration — Formed coil tube for handrails, facades, and structural elements requiring aesthetic finish and weather resistance.
- Automotive & Aerospace — Exhaust systems, fuel lines, and structural components demanding high-temperature strength and fatigue resistance.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a rigorous quality management system with the following certifications and compliance frameworks:
- ISO 9001:2015 — Quality Management System certification for consistent process control and continuous improvement.
- ISO 14001 — Environmental Management System ensuring responsible resource use and emissions control.
- ISO 45001 — Occupational Health and Safety management for a safe production environment.
- EN 10204 3.1 Certificates — Third-party material test certificates provided with every shipment, confirming chemical composition, mechanical properties, and dimensional compliance.
- NACE MR0175 / ISO 15156 — Compliance for sour-service applications (H₂S-resistant grades).
- PED (EU 2014/68/EU) — Pressure Equipment Directive conformity for pressure-vessel and piping applications.
Why Choose Wenzhou Jixing Metal Materials Co., Ltd.
- Transparent Pricing — The Ni/Mo/Cr LME-linked formula eliminates hidden cost risks and builds procurement confidence.
- Full Traceability — Every coil is serialized and traceable from raw material heat number to final delivery.
- Custom Flexibility — Non-standard OD, wall thickness, surface finish, and coil dimensions are accommodated with competitive lead times.
- Integrated Quality Assurance — In-line ultrasonic testing, hydrostatic pressure testing, and spectrometric composition analysis at every critical process stage.
- Strategic Location — Based in Wenzhou, Zhejiang — a global hub for stainless steel processing — providing access to optimized logistics and competitive port freight.