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As a leading Chinese nickel alloy manufacturer specializing in seamless pipes and capillary coils, we produce precision nickel alloy capillary tubes that combine extremely small dimensions with demanding process control. A nickel alloy capillary tube is a compact alloy tube manufactured by straightening and polishing nickel alloy coil tubing, developed for products that require high corrosion resistance and a fine, precise internal structure. Depending on the service condition, both seamless and welded capillary tubes are available, and polishing can be tailored with MP, EP, BA or AP technologies to meet different surface and cleanliness requirements. Available grades cover Monel (400, 401, K-500), Inconel (600, 601, 625, 718), Incoloy (800, 825, A-286) and Hastelloy (B-2, C-22, C-276), with outer diameters ranging from 0.4 mm to 16 mm, and fully customized sizes are supported on request.
Product characteristics
The first and most valued characteristic of nickel alloy capillary tube is its outstanding corrosion resistance. Thanks to the nickel-rich alloy matrix, these tubes withstand seawater, chloride-bearing solutions, acids, alkalis and high-temperature oxidation far better than ordinary stainless steel capillaries, making them reliable for long-term service in aggressive chemical and thermal environments.
Equally important is the excellent heat resistance. Nickel-based and high-temperature alloy grades retain stable mechanical properties at elevated temperatures, which is why capillary tubes are widely adopted in industrial furnaces, heat treatment plants and high-temperature gas systems where ordinary tubing would fail quickly.
On the mechanical side, the capillary tube offers good tensile properties, remarkable flexibility and durability. It can be coiled, bent and routed through confined spaces without cracking, while maintaining sufficient rigidity for fluid and gas delivery. This combination of strength and flexibility is essential for precision instrumentation and compact system designs.
Dimensional precision is another core advantage. Our capillary tubes are manufactured to strict tolerance ranges with beautiful, consistent surface appearance. Standard specifications include outside diameters from Φ0.4 mm to Φ16 mm, wall thicknesses from 0.1 mm to 3.0 mm, and lengths up to 12,000 mm, with custom sizes confirmed on request. All products comply with international standards such as ASTM B161, B163, B165, B167, B407, B423, B444, B468, B515, B516, B535, B622, B626, B674, B676, B677, B690, B704, B729, B751, B829 and B983.
Flexible polishing processes further enhance product value. MP (mechanical polishing), EP (electropolishing), BA (bright annealing) and AP (acid pickling) finishes are available to suit different application needs, from general industrial use to ultra-clean or corrosion-critical service. The smooth inner surface ensures consistent fluid flow, low friction and good water resistance, while the alloy also delivers favorable electromagnetic shielding performance for sensitive electronic and instrumentation applications.
Manufacturing process
For welded capillary tubes, production starts with high-quality alloy strip, which is strictly inspected and analyzed before entering automatic welding. After welding, the tube undergoes weld cleaning, seam grinding and degreasing, followed by curing heat treatment to restore and homogenize the welded structure. Each coil is then 100% tested by eddy current to detect any surface or internal defects, then straightened, cut to length, chemically cleaned and passivated. Finally, the tube is purged with deionized water and nitrogen, polished, inspected, marked and packed for shipment.
For seamless capillary tubes, the process begins from a mother pipe that is reduced through controlled cold-drawing passes with intermediate solution treatment, achieving fine grain structure, uniform wall thickness and superior pressure integrity. Solution treatment or aging treatment is applied according to the alloy grade to optimize mechanical properties. Both routes end with rigorous inspection, including eddy current testing and 100% hydrostatic pressure testing.
Quality assurance is embedded at every stage. Every shipment is delivered with material test certificates in accordance with EN 10204/3.1, and our professional sales team provides quotations within 24 hours. With an annual capillary production capacity exceeding 305 tons, we offer higher quality at a competitive price for global projects.
Applications
Nickel alloy capillary tubes are widely used in heat treatment pallets, frames and fixtures, steel wire split annealing and shooting tubes, high-speed gas burners, industrial furnace wire mesh belts, nitrogen reforming isolation tanks and catalytic support grids in nitric acid manufacturing, exhaust system components, combustion chambers of solid waste incinerators, pipe supports and soot handling parts, exhaust gas detoxification systems, and oxygen reheaters.
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.
