Stainless Steel Coil Tube with Chemical Degreasing Inner Surface Treatment
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. presents a premium-grade stainless steel coil tube engineered with a specialized chemical degreasing inner surface treatment process. This advanced finishing technique employs a continuous alkaline cleaning agent circulation flushing system to ensure the internal bore of the coil tube is completely free of organic contaminants, including rolling oils, drawing lubricants, and other hydrocarbon residues introduced during upstream manufacturing stages.
The chemical degreasing process is a critical quality assurance step that guarantees the purity and integrity of the tube's inner surface, making it suitable for demanding applications where product contact cleanliness, fluid purity, and long-term corrosion resistance are paramount. The resulting surface finish achieves exceptional chemical cleanliness, providing a reliable foundation for subsequent passivation, electropolishing, or direct end-use in sanitary and process industries.
Material & Properties
- Base Material: Austenitic stainless steel grades including 304, 304L, 316, 316L, 321, 310S, and 904L
- Form: Continuous coil tube (coiled configuration for ease of transport, storage, and downstream forming)
- Inner Surface Treatment: Chemical degreasing via alkaline cleaning agent circulation flushing
- Surface Purity: Removal of all organic residues — rolling oils, drawing oils, emulsions, and hydrocarbon contaminants
- Post-Treatment Readiness: Surface prepared for subsequent passivation, electropolishing, or direct sanitary-grade use
- Corrosion Resistance: Maintained and enhanced by elimination of organic contamination that could promote localized corrosion
Specifications
| Parameter | Specification |
|---|---|
| Product Category | Stainless Steel Coil Tube |
| Manufacturing Process | Seamless / Welded (available upon request) |
| Surface Treatment Level | Inner Surface — Chemical Degreasing |
| Cleaning Method | Alkaline cleaning agent circulation flushing |
| Target Contaminants Removed | Rolling oil, drawing oil, emulsions, and organic residues |
| Available Grades | 304, 304L, 316, 316L, 321, 310S, 904L |
| Outer Diameter Range | 6.0 mm – 300 mm (custom sizes available) |
| Wall Thickness Range | 0.3 mm – 12.0 mm (custom sizes available) |
| Coil Length | Standard coil lengths; customized upon request |
| Post-Treatment Compatibility | Passivation, electropolishing, annealing, peening |
| Standards Compliance | ASTM A213, ASTM A269, GB/T 12771, EN 10216-5 |
Manufacturing Process
Chemical Degreasing — Alkaline Cleaning Agent Circulation Flushing
The inner surface chemical degreasing process is performed through a rigorous, controlled multi-stage procedure:
- Pre-Inspection: Incoming coil tube undergoes visual and dimensional inspection to confirm baseline quality before surface treatment.
- Alkaline Cleaning Agent Formulation: A specially formulated alkaline cleaning solution — comprising high-pH surfactants, chelating agents, and emulsifiers — is prepared at controlled temperature and concentration to maximize saponification and emulsification of organic contaminants.
- Circulation Flushing: The alkaline cleaning agent is circulated through the entire internal bore of the coil tube under controlled pressure and flow rate. The continuous circulation ensures uniform contact between the cleaning solution and the inner surface, effectively dissolving and emulsifying all adhered organic residues.
- Dwell Time & Temperature Control: The process is maintained at optimal temperature (typically 60–80°C) for a calibrated dwell period to ensure complete chemical reaction with contaminants without damaging the base metal.
- Rinse Cycle: Following degreasing, a thorough multi-stage water rinse removes all residual cleaning agent, preventing any alkaline carryover that could compromise subsequent treatments.
- Post-Treatment Drying & Inspection: The degreased tube is dried and inspected for surface cleanliness, verifying the complete removal of rolling oils, drawing oils, and all organic residues.
Quality Control Measures
- Surfactant-based cleaning agent ensures emulsification of non-polar hydrocarbon oils
- Circulation method guarantees coverage of the full internal surface area, including bends and transitions in the coil
- Post-cleaning water quality monitoring to confirm absence of organic carryover
- Batch-level traceability for each chemical degreasing cycle
Applications
The chemical degreased inner surface treatment renders these stainless steel coil tubes suitable for the most demanding hygienic, chemical, and process applications:
- Food & Beverage Industry: Dairy processing, brewing, juice production, and food-grade fluid transfer lines where organic residue contamination is unacceptable
- Pharmaceutical Manufacturing: Clean-in-Place (CIP) compatible piping, drug delivery systems, and process vessels requiring verified surface cleanliness
- Semiconductor & Electronics: Ultra-pure chemical delivery, wafer processing fluid lines, and etchant transport systems
- Chemical Processing: Reagent transfer lines, reactor feed piping, and process loops where residual oils could catalyze unwanted reactions
- Medical Devices: Component tubing for medical equipment requiring certified organic-free internal surfaces
- Biotechnology & Biopharmaceuticals: Fermentation systems, CIP/SIP loops, and clean water distribution
- Heat Exchanger & Refrigeration: Coil tubes for heat exchange applications where internal cleanliness directly impacts thermal efficiency and service life
Quality Certifications & Standards
- ISO 9001:2015 — Quality Management System certification ensuring consistent process control
- ISO 14001 — Environmental Management System compliance for sustainable production practices
- ASTM A213 / ASTM A269 — Compliance with American standards for stainless steel tubing
- GB/T 12771 — Chinese national standard for welded stainless steel tubes
- EN 10216-5 — European standard for seamless stainless steel tubes
- 3-A Sanitary Standards — Applicable for food-grade applications post-degreasing
- Mill Test Certificates (MTC) — Provided with each shipment, including chemical composition and mechanical property verification
Unique Selling Points
- Complete Organic Contaminant Removal: The alkaline circulation flushing method achieves superior degreasing performance compared to single-pass or static immersion methods, ensuring 100% removal of rolling and drawing oils from the entire inner surface
- Full Bore Coverage: The circulation approach guarantees treatment of every point on the internal surface, including hard-to-reach areas within coil bends and transitions
- Process Consistency: Controlled temperature, concentration, flow rate, and dwell time parameters ensure repeatable, batch-to-batch quality
- Foundation for Advanced Finishes: The degreased surface serves as an ideal substrate for electropolishing, passivation, and other high-grade finishing treatments
- Corrosion Prevention: Elimination of organic residues prevents localized corrosion initiation and pitting that can occur when oils trap moisture and chlorides against the metal surface
- Coil Configuration Advantage: Delivered in coil form for maximum downstream flexibility — customers can cut, form, and fabricate to exact specifications without welding joints
Wenzhou Jixing Metal Materials Co., Ltd. — Committed to delivering stainless steel coil tube products with verified surface purity. Our chemical degreasing process represents the first essential step in achieving the highest standards of inner surface cleanliness for critical industrial applications.