First-Tier Domestic Stainless Steel Coil Tube — Baofeng Clean Series by Wenzhou Jixing Metal Materials
Product Overview
The Baofeng Clean Series Stainless Steel Coil Tube is a premium-grade, continuously coiled tubular product manufactured by Wenzhou Jixing Metal Materials Co., Ltd, a recognized first-tier domestic leader in the stainless steel tubing supply chain. Engineered for demanding industrial applications, this coil tube combines exceptional dimensional precision, superior surface cleanliness, and consistent metallurgical properties. As a top-tier domestic supplier, Wenzhou Jixing delivers production capacity, annual output value, and quality certifications that rank among the industry's highest standards, ensuring reliable supply continuity for large-scale procurement programs.
Industry Position: Wenzhou Jixing Metal Materials occupies the first-tier (domestic leader) position in the stainless steel coil tube supply chain, distinguished by industry-leading production capacity, output value, and comprehensive quality certifications.
Material & Properties
The Baofeng Clean Series is available in multiple austenitic and duplex stainless steel grades, selected to meet specific corrosion resistance, mechanical strength, and thermal performance requirements across diverse industrial environments.
Available Grades
- 304 / 304L (UNS S30400 / S30403): General-purpose austenitic grade with excellent corrosion resistance, weldability, and formability. Suitable for food processing, chemical, and architectural applications.
- 316 / 316L (UNS S31600 / S31603): Molybdenum-enhanced austenitic grade offering superior resistance to pitting and crevice corrosion in chloride-containing environments.
- 321 (UNS S32100): Titanium-stabilized austenitic grade with outstanding resistance to intergranular corrosion, ideal for high-temperature service.
- 310S (UNS S31008): High-temperature austenitic grade with exceptional oxidation resistance up to 1100°C (2012°F).
- 2205 Duplex (UNS S31803): Duplex austenitic-ferritic grade providing high yield strength, excellent resistance to chloride stress corrosion cracking, and good toughness.
Mechanical Properties (Typical)
| Property | 304 / 304L | 316 / 316L | 2205 Duplex |
|---|---|---|---|
| Tensile Strength (MPa) | ≥ 520 | ≥ 515 | ≥ 550 |
| Yield Strength (MPa) | ≥ 205 | ≥ 170 | ≥ 450 |
| Elongation (%) | ≥ 40 | ≥ 40 | ≥ 25 |
| Hardness (HB) | ≤ 201 | ≤ 217 | ≤ 310 |
| Maximum Service Temperature (°C) | 870 | 870 | 300 |
Surface Finish Options
- Pickled & Passivated (2B): Clean, matte surface suitable for general industrial use.
- Polished (No. 4): Fine ground, satin finish for aesthetic and hygienic applications.
- Mirror Polish (8K): Highly reflective finish for decorative and specialized applications.
- Electropolished: Ultra-clean, corrosion-resistant surface for pharmaceutical and food-grade applications.
Specifications
| Parameter | Specification |
|---|---|
| Outer Diameter (OD) | 3.00 mm – 152.40 mm (0.118 in – 6.000 in) |
| Wall Thickness | 0.30 mm – 6.00 mm (0.012 in – 0.236 in) |
| Coil Length (per coil) | Up to 1,000 m (3,281 ft) continuous coil |
| Coil Weight (typical) | 500 kg – 3,000 kg (1,100 lb – 6,600 lb) |
| OD Tolerance | ±0.05 mm (±0.002 in) for OD ≤ 25 mm; ±0.08 mm (±0.003 in) for OD > 25 mm |
| Wall Thickness Tolerance | ±10% of nominal |
| Roundness | ≤ 5% of OD |
| Coil Flatness | ≤ 0.5 mm/m (≤ 0.020 in/ft) |
| Applicable Standards | ASTM A213 / A269 / A270, EN 10216-5, GB/T 12771, JIS G3459 |
| End Condition | Plain end, beveled, or customized per drawing |
| Delivery Condition | Annealed & Pickled (A&P), or solution annealed |
Manufacturing Process
The Baofeng Clean Series coil tubes are produced through a fully integrated, precision-controlled manufacturing process that ensures consistent quality from raw material to finished coil:
- Raw Material Selection: High-purity stainless steel strip sourced from certified mills, with full chemical and mechanical traceability. Incoming material undergoes 100% spectral analysis (PMI) verification.
- Coiling & Forming: Precision CNC-controlled coiling equipment shapes the flat strip into seamless coil tubes with tight dimensional tolerances. Advanced servo-driven forming ensures uniform wall thickness throughout the coil length.
- Welding (for welded coil tube): Where applicable, orbital TIG (GTAW) welding is performed with inert gas shielding (argon or helium) to produce clean, uniform weld seams. Weld quality is verified via automated optical monitoring.
- Heat Treatment: Solution annealing is conducted at controlled temperatures (1050°C – 1150°C / 1922°F – 2092°F) followed by controlled cooling to restore full austenitic microstructure and optimize corrosion resistance.
- Pickling & Passivation: Tubes are subjected to acid pickling to remove oxide scale, followed by passivation treatment to restore the protective chromium oxide layer, ensuring maximum corrosion resistance.
- Surface Finishing: Internal and external surfaces are polished or electropolished as specified, achieving the required surface cleanliness and finish grade.
- Quality Inspection: Every coil undergoes comprehensive inspection including dimensional measurement, ultrasonic testing (UT), hydrostatic pressure testing, visual inspection, and chemical composition verification.
- Coiling & Packaging: Finished tubes are coiled on protective mandrels, wrapped in moisture-resistant packaging, and labeled with full traceability documentation for shipment.
Applications
The Baofeng Clean Series stainless steel coil tubes are designed for a wide range of demanding industrial applications where reliability, corrosion resistance, and dimensional precision are critical:
- Heat Exchangers & Condensers: Continuous coil tube eliminates joints and potential leak points in heat exchange applications, improving thermal efficiency and reducing maintenance requirements.
- Food & Beverage Processing: Hygienic-grade surfaces meet FDA and 3-A sanitary standards for dairy, brewing, and food processing equipment.
- Pharmaceutical & Biotechnology: Electropolished and passivated surfaces support GMP-compliant cleanroom environments and CIP/SIP sterilization protocols.
- Chemical & Petrochemical Processing: 316L and 2205 duplex grades withstand aggressive chemical environments, including chlorides, acids, and caustic solutions.
- Power Generation: Used in boiler tubes, superheaters, and economizers where high-temperature resistance and long service life are essential.
- Automotive Industry: Applied in catalytic converter substrates, exhaust systems, and fuel cell components.
- Oil & Gas: Resistant to sour gas environments (H₂S, CO₂) and suitable for subsea and offshore applications.
- Water Treatment & Desalination: Corrosion-resistant performance in brackish and seawater environments.
Quality Certifications & Compliance
As a first-tier domestic leader, Wenzhou Jixing Metal Materials maintains an extensive portfolio of quality certifications and complies with the most rigorous international standards:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and process control.
- ISO 14001:2015 — Environmental Management System certification demonstrating commitment to sustainable manufacturing practices.
- ISO 45001:2018 — Occupational Health & Safety Management System certification.
- CE Marking — Compliance with European Union directives for pressure equipment and machinery.
- ASME Stamp — Authorized for manufacture of pressure-containing components to ASME Section VIII Division 1.
- EN 10204 3.1 Certificates — Third-party material certification available upon request for all shipments.
- Mill Test Reports (MTR) — Full traceability documentation including chemical analysis, mechanical test results, and heat treatment records provided with each lot.
- NSF/ANSI 61 — Certification for drinking water system components (where applicable).
- PED (Pressure Equipment Directive 2014/68/EU) — Compliance for pressure equipment applications.
Unique Selling Points
- First-Tier Domestic Leadership: Wenzhou Jixing Metal Materials is recognized as a top-tier domestic supplier, offering the highest production capacity, output value, and certification coverage in the Chinese stainless steel coil tube market.
- Baofeng Clean Quality Standard: The Baofeng Clean designation represents a proprietary quality benchmark exceeding standard industry requirements for surface cleanliness, dimensional accuracy, and metallurgical consistency.
- Industry-Leading Production Capacity: Large-scale manufacturing infrastructure ensures reliable supply for high-volume procurement programs with minimal lead times.
- Full Traceability: Every coil is accompanied by comprehensive documentation including heat number, chemical analysis, mechanical test data, and dimensional inspection records.
- Customization Capability: Flexible production parameters allow customization of dimensions, surface finish, end treatment, and packaging to meet specific customer requirements.
- Supply Chain Reliability: As a first-tier supplier, Wenzhou Jixing provides stable supply continuity, competitive pricing, and responsive after-sales technical support.