Import 3/8od 0.049wt Duplex 2205 Capillary Tubing — Buy in wholesale FOB from Supplier in China

This seamless capillary tubing measures 3/8 inch outside diameter by 0.049 inch wall thickness, manufactured from duplex stainless steel grade 2205 with nominal composition 22% chromium, 5% nickel, 3% molybdenum and balance iron per UNS S31803/S32205. The duplex austenitic-ferritic microstructure delivers yield strength approximately double that of austenitic 316L while maintaining superior resistance to chloride stress corrosion cracking and pitting. This specific 0.049 inch wall configuration provides a calculated burst pressure significantly higher than standard 0.035 inch control line alternatives, making it suitable for high-pressure downhole and process instrumentation service.

Duplex 2205 capillary tubing for oilfield control line applications is typically supplied to ASTM A789 or ASTM A790 specifications for seamless ferritic/austenitic stainless steel tubing, though buyers should confirm which standard ESP Cable Solutions certifies against. The 0.049 inch wall thickness represents a heavier schedule than minimum-weight control line options, offering improved collapse resistance under external pressure and better mechanical protection during coiled tubing deployment. Typical manufacturing involves cold drawing from seamless hollows followed by solution annealing and pickling, with eddy current or ultrasonic testing for longitudinal defects. Surface finish is typically pickled and passivated, with bright annealed options available for specialised applications.

Primary applications include chemical injection lines, hydraulic control lines for subsea and downhole safety valves, instrumentation impulse lines in corrosive process plants, and high-pressure sampling systems. The tubing is supplied in long continuous coils to facilitate installation without intermediate joints. Buyers should confirm coil lengths, reel diameters, and whether ESP provides orbital welding fittings or only bare tubing. End users include oilfield service companies, petrochemical engineering contractors, and instrumentation system integrators. Testing certificates, third-party inspection options, and compliance with NACE MR0175/ISO 15156 for sour service should be verified directly with the supplier.

ESP Cable Solutions Co., Limited is located at Building D2, Zhongyi 1688 Creative Industry Park in Qingdao, Shandong Province, China. The company positions itself as a professional manufacturer of control line coil tubing, with product range extending to 316L and alloy 825 grades in addition to the duplex 2205 offering. The harbour trust tier and zero response rate on the platform suggest limited automated engagement, so buyers should initiate direct contact with Kim Wang or the sales team for technical discussions and quotation.

The supplier's own description emphasises export-focused manufacturing and project support, though no specific certifications (ISO 9001, API, or product mill test certificates) are mentioned in the source material. Production capabilities across multiple corrosion-resistant alloys indicate some metallurgical processing competence, but buyers must verify actual manufacturing scope, whether tubing is produced in-house or sourced as hollows for finishing, and quality system accreditation status. No information is provided about annual output, number of employees, or reference projects.