Stainless Steel Coil Tube with Comprehensive Non-Standard Testing & Inspection Services
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. (Product No. 191) offers high-performance stainless steel coil tubes engineered for demanding industrial applications. Beyond delivering premium-grade coiled tubing, the company distinguishes itself through an extensive suite of non-standard additional testing and inspection services—ensuring that every batch meets the exacting quality requirements of end users across energy, chemical processing, food and beverage, and pharmaceutical industries.
Unlike standard supply arrangements where testing is limited to routine in-house verification, Wenzhou Jixing provides project-specific, batch-level testing protocols that are quoted and executed independently of the base material price. This modular quality assurance framework gives customers full control over inspection depth, scope, and certification level.
Material & Properties
The coil tubes are manufactured from premium austenitic stainless steel grades, including but not limited to AISI 304, 304L, 316, 316L, 321, and 310S. These alloys deliver exceptional corrosion resistance, high-temperature strength, and long-term durability in aggressive environments.
- Corrosion Resistance: Superior resistance to pitting, crevice corrosion, and intergranular corrosion, particularly in chloride-rich and acidic environments.
- Mechanical Properties: High tensile strength and excellent ductility, suitable for forming, bending, and welding without loss of structural integrity.
- Temperature Range: Operational from cryogenic temperatures up to 870°C (1,600°F), depending on grade.
- Hygienic Surface: Available in polished (2B, BA, or mirror finish) or pickled surface conditions for food-grade and pharmaceutical compliance.
Specifications
| Parameter | Specification Range |
|---|---|
| Outer Diameter (OD) | 3.0 mm – 159.0 mm (1/8" – 6") |
| Wall Thickness | 0.3 mm – 6.0 mm (0.012" – 0.236") |
| Coil Length | Standard: 200 m – 500 m per coil; custom lengths available |
| Coil Diameter | 500 mm – 1,200 mm (adjustable per shipping requirements) |
| Available Grades | 304, 304L, 316, 316L, 321, 310S, 904L, and custom alloys |
| Manufacturing Method | Seamless and welded (ERW/TPAW) coil tube |
| Surface Finish | 2B, BA (Bright Annealed), No.4 Polish, Mirror Polish |
| Applicable Standards | ASTM A213/A269, ASME SA-213/SA-269, EN 10217, GB/T 12771 |
Manufacturing Process
The production of Wenzhou Jixing stainless steel coil tubes follows a rigorously controlled multi-stage process:
- Material Selection: Sourced from certified mills with full heat-number traceability and mill test certificates (MTC) in accordance with EN 10204 3.1 or 3.2.
- Forming & Coiling: Precision roll-forming or seamless piercing followed by controlled coiling at optimized speeds to prevent work hardening and maintain dimensional accuracy.
- Heat Treatment: Solution annealing and pickling (or bright annealing) to restore full corrosion resistance and achieve the desired surface finish.
- Dimensional Verification: In-line laser measurement of OD, wall thickness, and roundness during production.
- Final Inspection: Comprehensive dimensional, visual, and non-destructive testing prior to packaging.
Non-Standard Additional Testing Services
A defining differentiator of Wenzhou Jixing's offering is the availability of project-specific, non-standard testing programs that go beyond routine factory inspection. These services are quoted separately per project or batch and are not included in the base material price, providing customers with a transparent, on-demand quality assurance framework.
1. Third-Party Re-Inspection
Customers may commission independent third-party inspection agencies (e.g., SGS, Bureau Veritas, TÜV, DNV) to perform full or partial re-inspection of delivered coil tube batches. Wenzhou Jixing facilitates coordination with recognized inspection bodies and provides all necessary documentation, access, and test coupon preparation. This service is particularly valuable for:
- Regulatory-mandated pre-shipment inspections
- Owner's Engineer verification on EPC projects
- Critical infrastructure and safety-critical applications
- Dispute resolution or quality audit requirements
2. Special Corrosion Testing
Beyond standard chemical analysis and mechanical testing, Wenzhou Jixing arranges specialized corrosion testing tailored to the customer's specific operating environment:
- Pitting & Crevice Corrosion: ASTM G48 (Ferric Chloride), ASTM G150 (CREVIT), and ASTM G154 (HIC) testing
- Intergranular Corrosion: ASTM A262 Practice E (Oxalic Acid) and Practice F (Sulfuric Acid–CuSO₄) testing
- Stress Corrosion Cracking (SCC):strong> ASTM G58 and ASTM G108 testing for chloride environments
- Uniform Corrosion Rate: ASTM G1 or ASTM G31 immersion testing in customer-specified media
- High-Temperature Oxidation: Cyclic oxidation testing for elevated-temperature applications
3. Full-Inspection Cleanliness Verification
For hygienic and high-purity applications, Wenzhou Jixing offers 100% (full-lot) cleanliness inspection rather than statistical sampling. This includes:
- Internal Surface Inspection: Borescope or high-resolution camera inspection of every coil length for contamination, scale, or particulate matter
- External Surface Inspection: 100% visual and automated surface defect detection for scratches, dents, or discoloration
- Particle Counting: Fluid or air particle analysis per ISO 16232 or customer specifications
- Residual Contaminant Analysis: Surface spectroscopy (XRF/OES) to confirm absence of carbon, sulfur, or foreign metal contamination
- Post-Cleaning Verification: Acid pickling and passivation verification via passivation test (ASTM A967) and red-ox test (ASTM A380)
Applications
The combination of premium coil tube quality and comprehensive testing services makes Wenzhou Jixing's products suitable for a wide range of critical applications:
- Heat Exchangers & Boilers: Spirally wound coils for shell-and-tube heat exchangers, condensers, and evaporators in oil, gas, and power generation.
- Chemical Processing: Reactor internals, heat transfer coils, and piping systems handling aggressive chemicals.
- Food & Beverage Industry: Hygienic-grade coils for pasteurizers, UHT processing, and CIP/SIP systems (FDA-compliant).
- Pharmaceutical Manufacturing: GMP-compliant coils for bioreactors, fermenters, and clean steam systems.
- Oil & Gas: Downhole tubing, subsea coils, and offshore heat exchanger applications.
- Automotive & Aerospace: Exhaust system coils, fuel delivery lines, and cryogenic fuel systems.
- Nuclear & Energy: Instrumentation tubing and containment system coils requiring traceability and non-standard testing.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a robust quality management framework to support both standard and non-standard testing requirements:
- ISO 9001:2015 – Quality Management System certified
- ISO 14001 – Environmental Management System certified
- ISO/TS 22163 – Automotive quality management (for automotive-grade applications)
- EN 10204 – Material documentation compliance (3.1 and 3.2 certificates)
- PEER / PED – Pressure Equipment Directive compliance for European market
- NACE MR0175 / ISO 15156 – H₂S resistance testing available for oil & gas applications
All non-standard testing services are performed by NADCAP-accredited or ISO 17025-accredited laboratories, ensuring that results are internationally recognized and legally defensible. Full test reports with traceability to specific heat numbers, coil IDs, and batch identifiers are provided with every tested shipment.
Key Selling Points
- Transparent, Modular Testing: Non-standard testing is quoted separately per project or batch—customers pay only for the inspection depth they require, with no hidden fees in the base material price.
- Full Traceability: Every coil tube batch is linked to its mill heat number, production lot, and test documentation from raw material through final delivery.
- Third-Party Independence: Customers retain the right to engage independent inspectors, ensuring impartial verification of quality claims.
- Customized Corrosion Testing: Specialized corrosion testing can be tailored to the exact chemical environment, temperature, and pressure conditions of the end application.
- 100% Cleanliness Inspection: Full-lot inspection eliminates sampling risk, making the product suitable for the most demanding hygienic and high-purity applications.
- Global Compliance: Products and testing services meet ASTM, ASME, EN, GB, and industry-specific standards for worldwide market acceptance.
Ordering & Quotation
Non-standard testing services are quoted on a per-project or per-batch basis. To obtain a detailed quotation, customers should provide:
- Required testing scope (third-party inspection, corrosion testing type, cleanliness level)
- Target standards or specifications for testing acceptance criteria
- Quantity and batch structure of the order
- Preferred inspection agency (if third-party inspection is required)
- Applicable delivery terms and destination
Wenzhou Jixing Metal Materials Co., Ltd. welcomes inquiries from OEMs, EPC contractors, engineering firms, and end users seeking premium stainless steel coil tubes backed by comprehensive, project-specific quality assurance.