Stainless Steel Coil Tube — Second-Tier Domestic Supplier Grade (Tier II)
1. Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. (温州吉兴金属材料有限公司) supplies high-quality Stainless Steel Coil Tube (盘管) sourced from China's second-tier domestic manufacturers — specifically JIULI (久立), Wujin (武进), Huaxin Lihua (华新丽华), and Yongxing (永兴). These suppliers constitute the backbone of China's industrial stainless steel pipeline supply chain, delivering a superior balance of cost-efficiency, mechanical performance, and material consistency.
The Second-Tier Domestic Grade (第二梯队) represents the optimal value proposition for industrial applications that demand reliable quality without the premium associated with Tier I import-grade materials. These products are widely accepted across most regulated industries, including petrochemical, food processing, pharmaceutical, and general engineering.
2. Material & Properties
2.1 Available Grades
- Austenitic Grades: 304 (S30408), 304L (S30403), 316 (S31608), 316L (S31603), 321 (S32108), 310S (S31008)
- Duplex Grades: 2205 (S31803), 2507 (S32750)
- Super-Austenitic: 904L (S31503)
2.2 Key Mechanical Properties (Typical — Grade 304/316L)
- Tensile Strength (抗拉强度): ≥ 520 MPa (304), ≥ 485 MPa (316L)
- Yield Strength (屈服强度): ≥ 205 MPa (304), ≥ 170 MPa (316L)
- Elongation (延伸率): ≥ 40% (304), ≥ 35% (316L)
- Hardness (硬度): ≤ 92 HRB (annealed condition)
- Corrosion Resistance (耐腐蚀性): Excellent resistance to atmospheric, aqueous, and chemical media
2.3 Unique Selling Points
- Cost-Performance Ratio (性价比): Up to 30–40% cost advantage over Tier I imported equivalents while maintaining ≥ 95% of performance specifications
- Industry Access (行业准入): Approved for use in the majority of regulated industrial sectors
- Supply Stability: Large-scale domestic production ensures consistent lead times and volume availability
- Customization Capability: Flexible order quantities and dimensional tolerances to meet project-specific requirements
3. Specifications
| Parameter | Specification | Standard Reference |
|---|---|---|
| Product Form | Coil Tube / Coil Pipe (盘管) | — |
| Outer Diameter (OD) | Φ 6.0 mm – Φ 219.1 mm | ASTM A213 / A269; GB/T 12771 |
| Wall Thickness (WT) | 0.5 mm – 12.0 mm | ASTM A213 / A269; GB/T 12771 |
| Coil Length | Continuous coil, typical 50 m – 500 m per coil | — |
| OD Tolerance | ± 0.10 mm (small bore); ± 0.25 mm (large bore) | ASTM A213 |
| WT Tolerance | ± 10% (minimum 0.05 mm absolute) | ASTM A213 |
| Surface Finish | Pickled & Passivated (P&P); Bright Annealed (BA) | ASTM A473 |
| End Condition | Cut ends, beveled, or plain | — |
| Heat Treatment | Solution Annealed (固溶退火) | ASTM A213 |
| Testing | Hydrostatic Test (水压试验); Eddy Current (涡流检测); SPIRIT (穿透检测) | ASTM A213; EN 10217 |
| Packaging | Wooden coil cradle with waterproof wrapping; export-grade | ISO 4180 |
| Supplier Tier | Second-Tier Domestic (第二梯队国产): JIULI / Wujin / Huaxin Lihua / Yongxing | — |
4. Manufacturing Process
- Raw Material Procurement: Virgin or certified recycled stainless steel billet/slab sourced from accredited mills within the JIULI, Wujin, Huaxin Lihua, and Yongxing production networks.
- Hot Rolling / Cold Drawing: Tubes are formed via hot-rolled seamless or cold-drawn processes depending on final diameter and wall thickness requirements.
- Piercing & Sizing: For seamless production, the billet is heated to 1,200–1,300°C and pierced through a mandrel; dimensions are refined through rolling mills.
- Solution Annealing (固溶处理): Tubes are heated to 1,050–1,150°C and rapidly quenched to achieve a uniform austenitic microstructure, ensuring maximum corrosion resistance and ductility.
- Pickling & Passivation (酸洗钝化): Surface oxidation and scale are removed via hydrofluoric/nitric acid pickling; a protective chromium oxide passive film is established.
- Coiling: The continuous tube is wound into a controlled-diameter coil on a precision coiler, maintaining uniform tension to prevent deformation.
- Non-Destructive Testing (NDT): Each coil undergoes 100% inline eddy current testing (ECT) and SPIRIT testing; hydrostatic testing is performed at pressures of 2–3× design pressure.
- Final Inspection & Packaging: Dimensional verification, chemical analysis, and mechanical testing confirm compliance; coils are packaged for domestic or export shipment.
5. Applications
- Petrochemical & Oil/Gas (石油化工): Heat exchanger tubing, process piping, and reactor internals
- Food & Beverage Processing (食品加工): Hygienic transfer lines, CIP/SIP-compatible piping systems
- Pharmaceutical (制药): Clean-in-place piping, bioreactor connections
- Power Generation (发电): Boiler tubes, condenser tubes, steam lines
- Marine & Offshore (海洋工程): Ballast systems, fuel lines, seawater piping
- General Engineering & Construction (通用工程): Structural supports, fluid conveyance, architectural applications
- Automotive & Aerospace (汽车/航空): Exhaust systems, fuel lines, hydraulic tubing
6. Quality Certifications
- ISO 9001:2015 — Quality Management System
- ISO 14001:2015 — Environmental Management System
- EN 10204 — Type 3.1 Inspection Certificate (Mill Test Report)
- ASTM A213 — Seamless Austenitic Stainless Steel Tube for High-Temperature Service
- ASTM A269 — Seamless and Welded Austenitic Stainless Steel Tube for Chemical and Allied Lines
- GB/T 12771 — Chinese National Standard for Welded Stainless Steel Tubes for General Purposes
- GB/T 13296 — Chinese National Standard for Seamless Stainless Steel Tubes
- API 5L / API 5CT — Available upon request for oil & gas applications
- PEI (Petroleum Engineering Institute) — Approved supplier for selected petrochemical projects
Supplier Note: The Second-Tier Domestic Grade (第二梯队国产) from JIULI, Wujin, Huaxin Lihua, and Yongxing represents China's industrial workhorse (工业主力军) segment. These products deliver proven reliability across the majority of industry access requirements (多数行业准入), making them the recommended specification for projects prioritizing cost-efficiency without compromising on critical performance parameters.