Stainless Steel Coil Tube — Actual Weighbridge Settlement
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. supplies premium-grade stainless steel coil tubes (盘管) engineered for demanding industrial, chemical, pharmaceutical, and food-grade applications. Delivered in continuous coil form, these tubes offer superior material utilization, reduced cutting waste, and seamless integration into downstream forming, welding, and machining operations. As a leading supplier in the Wenzhou stainless steel hub, our coil tube products are manufactured to international standards and backed by rigorous quality control protocols.
A defining feature of our commercial offering is the actual weighbridge settlement method (实际过磅结算) — a transparent, weight-based pricing and payment model that ensures complete fairness between buyer and seller.
Material & Properties
Our stainless steel coil tubes are available in a wide range of austenitic, ferritic, and duplex grades, each selected to meet specific performance requirements:
- 304 / 304L — Excellent general corrosion resistance; ideal for food processing, chemical equipment, and architectural applications.
- 316 / 316L — Superior chloride and pitting resistance; preferred for marine, pharmaceutical, and high-purity chemical environments.
- 321 — Stabilized for high-temperature service up to 870 °C; resistant to intergranular corrosion.
- 310S — Exceptional oxidation resistance for furnace components and heat treatment equipment.
- 430 / 439 — Cost-effective ferritic grades for decorative and atmospheric applications.
- 2205 Duplex — High yield strength with excellent chloride stress-corrosion cracking resistance.
Specifications
| Parameter | Specification / Range |
|---|---|
| Outer Diameter (OD) | Φ3.0 mm – Φ219.0 mm |
| Wall Thickness | 0.2 mm – 12.0 mm |
| Coil Length | Customizable (typically 20 – 100 m per coil) |
| Coil Inner Diameter | Φ100 mm – Φ500 mm |
| Surface Finish | No. 1, 2B, BA, No. 4, HL, Mirror (8K) |
| Manufacturing Method | Seamless (Pierced / Extruded) or Welded (ERW / EFW) |
| Standards | ASTM A213, ASTM A554, ASME SA-213, EN 10216, GB/T 12771, GB/T 13296 |
| Pricing Basis | Weight-based (per kg / per metric ton) |
| Settlement Method | Actual weighbridge / tail-lift scale measured net weight (实际过磅结算) |
Manufacturing Process
The production of our stainless steel coil tubes follows a tightly controlled multi-stage process:
- Raw Material Selection — Virgin stainless steel billets and slabs sourced from certified mills, with full chemical composition verification prior to processing.
- Piercing / Extrusion / Welding — Seamless tubes are produced via hot piercing or hydraulic extrusion; welded tubes are manufactured using ERW or EFW processes with precision edge alignment.
- Hot Rolling & Annealing — Tubes are hot-rolled to approximate dimensions and subsequently annealed in a controlled atmosphere to achieve required grain structure and mechanical properties.
- Cold Drawing / Sizing — For tighter tolerances, tubes undergo cold drawing through calibrated dies to achieve final OD and wall thickness specifications.
- Pickling & Passivation — Acid pickling removes scale and oxide layers; passivation treatment establishes a protective chromium oxide film for enhanced corrosion resistance.
- Coiling — Finished tubes are coiled onto mandrels at controlled tension to prevent deformation, ensuring uniform curvature and handling stability.
- Quality Inspection — Every coil undergoes 100% visual inspection, dimensional verification, and sample-based mechanical and chemical testing prior to dispatch.
Applications
Our stainless steel coil tubes serve a broad spectrum of industries:
- Heat Exchangers & Boilers — Coil tubes are ideal for tube bundles, condensers, and evaporators where continuous forming reduces material waste.
- Chemical & Petrochemical Processing — Resistant to aggressive media; used in reactors, distillation columns, and piping systems.
- Food & Beverage Processing — Hygienic-grade surfaces compliant with FDA and 3-A standards for dairy, brewing, and pharmaceutical lines.
- Automotive & Engineering — Exhaust systems, structural components, and hydraulic lines.
- Construction & Architecture — Decorative facades, railings, and structural supports.
- Energy & Power Generation — Boiler tubes, superheaters, and pressure vessel components.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains rigorous quality assurance aligned with international standards:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001 — Environmental Management System
- EN 10204 — Type 3.1 mill test certificates provided with every shipment
- CE Marking — Compliance with European pressure equipment directives (PED)
- NACE / AMPP — Coating and corrosion control compliance where applicable
- Third-Party Inspection — Available upon request (SGS, BV, TUV, etc.)
Unique Selling Points — Transparent Weight-Based Settlement
One of the most significant commercial advantages of sourcing coil tubes from Wenzhou Jixing Metal Materials Co., Ltd. is our commitment to the actual weighbridge settlement method (实际过磅结算). This approach offers the following benefits:
- Full Transparency — Each coil's net weight is measured using calibrated weighbridges (地磅) or tail-lift scales (吊秤) at the point of delivery, eliminating ambiguity.
- Fair Pricing — Buyers are invoiced based on the true net weight of the product received, not on theoretical or nominal weights that may include dimensional tolerances.
- Elimination of Tolerance Disputes — By settling on actual measured weight, both parties avoid costly disagreements arising from manufacturing tolerances in OD, wall thickness, and length.
- Industry Best Practice — Actual weighbridge settlement is the mainstream and most trusted pricing method for stainless steel coil tubes in China's industrial supply chain, and we adhere to it as standard practice.
- Verifiable Documentation — Weighbridge tickets and settlement records are provided with every transaction for full traceability and audit compliance.
Note: All stainless steel coil tubes are supplied with complete material traceability documentation, including heat number, chemical analysis, mechanical test reports, and dimensional certificates. Custom specifications, surface treatments, and coil configurations are available upon request to meet specific project requirements.