Selection Guide for Pure Nickel Alloy Capillary Tubes in Industrial Applications

As a professional nickel alloy source manufacturer, Jiangsu Zhongxing Nickel Alloy produces seamless pure nickel alloy capillary tubes including Nickel 200 (UNS N02200) and Nickel 201 (UNS N02201). Many project engineers overlook the subtle performance gaps between these two grades and end up with improper material selection. This practical guide covers core performance, typical industry scenarios and key selection rules to help buyers pick suitable pure nickel alloy capillary tubes and avoid unexpected field failures.

Pure nickel capillary is made of high purity nickel matrix. It delivers outstanding resistance against caustic alkali, dry halogen gas and reducing condition media, together with good ductility, weldability and high thermal electrical conductivity. The main distinction between Nickel 200 and Nickel 201 lies in carbon content. Nickel 200 is fit for working temperatures below 315 °C. Nickel 201 adopts strict low carbon control to prevent graphitization embrittlement under long term thermal cycling, so it is the preferred choice for sustained elevated temperature service. It is worth noting that pure nickel capillary has limited performance in chloride rich seawater and strong oxidizing acid environments, where nickel chromium alloy alternatives should be considered.

Different industries set distinct requirements for pure nickel alloy capillary. In chlor alkali and chemical plants, it serves sampling impulse lines and small bore alkali medium transfer tubing. In aerospace and gas turbine auxiliary systems, it works for fuel gas sampling and instrument sensing circuits. Electronic and semiconductor factories adopt it for special fluid delivery and sensor protection sleeves. Vacuum furnace equipment also widely uses pure nickel capillary for internal gas purge pipelines. When specifying, users need to sort out working temperature, medium composition, operating pressure, dimension tolerance and surface finish requirements.

Our pure nickel alloy capillary is manufactured by multi pass cold drawing plus intermediate annealing. We support custom outer diameter, wall thickness, cut to length and pre bent shapes. Every batch undergoes 100 % eddy current inspection and full dimensional verification. EN 10204 3.1 mill test reports are provided for complete material traceability. Buyers are encouraged to share full working condition parameters so our technical team can give targeted grade recommendations.

Q&A

Q1: How do I choose between Nickel 200 and Nickel 201 pure nickel alloy capillary

A1:  Select Nickel 200 for service consistently below 315 °C under mild chemical or electronic conditions. Choose Nickel 201 if the component faces long term high temperature exposure or frequent thermal cycling to avoid carbon induced graphitization embrittlement.

Q2: Is pure nickel alloy capillary suitable for seawater exposed piping

A2:  Not recommended. Without chromium and molybdenum elements, pure nickel is vulnerable to pitting corrosion in chloride containing seawater. Inconel 625 or Monel 400 capillary will be better options for marine environments.

Jiangsu Zhongxing Nickel Alloy Co., Ltd. specializes in the R&D and production of seamless pipes and capillary coils. We have a wide product portfolio covering nickel alloys, high-temperature alloys, nickel-copper alloys, nickel-titanium alloys, Invar alloys, soft magnetic alloys and other alloy materials. For more information, factory visits are available. Please contact us at 181-2137-6062 for further inquiries.