Pure Tantalum Capillary Tube

In modern chromatography (HPLC), high-end biomedical implants (such as marker rings, vascular stents), semiconductor ultra-pure microfluidic chips, and high-temperature temperature sensors, the diameter of the fluid channel is usually miniaturized to the millimeter or even micron level. In such a very small space, the fluid puts forward extremely stringent requirements on material corrosion, microflow resistance, metal ion precipitation pollution (Leaching) and pressure limit.

As shown by reference to figure, our high-performance seamless pure tantalum capillary tubes (High-Precision Seamless Tantalum Capillary Tubes) strictly use 100% high-purity R05200 pure tantalum (purity ≥ 99. 95%) that has been smelted multiple times by high vacuum electron beam (EB) as the base material. After multi-pass Cold Drawing (Cold Drawing) and precision micro-wall reduction molding, combined with multi-stage high vacuum annealing in the middle, the product not only precisely controls the size tolerance at the micron level, but also achieves ultra-high flatness and crack-free micro-morphology. This series of capillaries is extremely biocompatible to the human body and can resist strong acids for life. It is an indispensable physical channel for cutting-edge fluid and electrode systems.

I. Excellent core advantages (Elite Engineering Advantages)

Ultra-high dimensional accuracy and uniform wall thickness (Micron-Level Tolerances): As shown in the figure, the inner diameter (ID) and outer diameter (OD) tolerances of our tantalum capillary tubes can be precisely controlled within ± 0.01 mm or even ± 0.005 mm. The extremely uniform wall thickness ensures that the pipe will not cause thermal deformation or stress rupture due to local wall thinness when it passes through high pressure and high flow rate corrosive media.

Nano-level flatness and super-low fluid resistance (Super-Smooth Inner Surface): With special drawing die and super-lubricating molding technology, the tantalum pipe is as smooth as a mirror, without mechanical scratches, wrinkles or stretch marks. This not only greatly increases the turbulence and flow resistance in the fluid microchannel, but also effectively prevents the physical adsorption residue of trace chemical molecules or proteins in the sample, and prevents cross-contamination of detection signals.

Excellent molding plasticity and Burr-Free flush end face (Burr-Free & Formable Ends): Our capillary tubes are in a fully annealed soft state (Annealed State), with an elongation rate of up to 25%, which can be used by customers for later bending, flaring, shrinking or crimping with high-pressure joints with a very small radius. The end face of all factory pipe fittings has been processed by precision grinding and ultrasonic deburring, and the incision is flat, which perfectly matches the non-destructive assembly of medical and precision instruments.

II. Core technical parameters and chemical composition matrix (Technical Parameter & Chemistry Matrix)

In order to meet the high traceability standards of our clients, the core technical parameters are sorted out as follows:

Technical Parameter & Chemistry Matrix

Dimensions	Technical Specifications & Matrix
Basic Info
Material Grade	R05200 (unalloyed high-purity pure tantalum) \| Optional R05400 (electron beam remelting ultra-low gap pure tantalum grade)
Standards	ASTM B521 (Standard Specification for Seamless and Welded Tantalum and Tantalum Alloy Pipes)
Supply Status	High Vacuum Completely Annealed Soft State (Vacuum Annealed)
Surface Finish	Bright Polished & Pickled) to ensure that there is no residue and no microscopic crack under the mirror of the inner and outer walls
Specifications	Can be customized for specific high-precision applications (Supports customization for micro-fluidic designs)
OD Range	Φ 0.2 mm - φ 5.0mm
Wall Thickness	Can be made to diameter φ 10mm-φ 500 mm (excellent wall thickness tolerance ± 0.05 mm can still be maintained under large deformation)
Tolerance	OD/ID: ± 0.01 mm (limit up to ± 0.005 mm); Wall thickness: ± 10%
Mechanical	Standard Indicators after Stress Relief Annealing of Pipes at Room Temperature 20 °C (Considering Microchannel High Pressure Resistance and Bending Rigidity)
Tensile Strength	≥ 205 MPa (with excellent self-supporting and deformation-resistant stiffness of miniature fittings)
Yield Strength	≥ 140 MPa
Elongation	≥ 25% (ensure that ultra-thin pipes will never crack in the wall when they are finely bent or circled)
Chemistry %	Purity ≥ 99.95%, strict control of key embrittlement gas elements and sensitizing heavy metals
Ta (Matrix Purity)	≥ 99. 95% (provides excellent bio-compatibility and antiseptic substrate)
Nb (niobium impurity control)	≤ 0.05% (controlled to a minimum to prevent electrochemical heterogeneity)
Fe｜Ni｜Cr	Fe ≤ 0.005%｜Ni ≤ 0.002%｜Cr ≤ 0.002%
O｜N｜H	O ≤ 0.015%｜N ≤ 0.01%｜H ≤ 0.0015% (within 15 ppm to prevent hydrogen embrittlement)

III. Lean cold drawing process and surface ultra-clean control (Manufacturing Process)

Seamless Piercing & Multi-Pass Drawing: Taking R05200 high-purity seamless tantalum tube blank as the starting point, it has been processed by multi-stage precision cold drawing with more than 20 passes and micro-deformation. Grain state tracking is carried out after each drawing pass to ensure that no micro-tensile delamination occurs.

High-Vacuum Interstage Annealing: Before each drawing reaches the critical cold work hardening point, the semi-finished product is sent to a high-vacuum annealing furnace, and the vacuum degree is higher than10^-3Pa. Uniform annealing in the furnace temperature, re-refining the grain and releasing lattice distortion to maintain the perfect elongation required for subsequent fine drawing.

High-precision inner hole polishing and pickling activation (Inner Surface CMP/Passivation): Multistage micro-polishing and pickling of capillary tubes are carried out by using special ultra-fine high-pressure fluid abrasives or mixed acid solutions (HF-HNO3). A thin layer of dense and extremely uniform tantalum pentoxide (Ta2O5) inert protective film is produced by chemical peeling off the uneven residue of the surface layer.

CNC non-destructive fixed-length cutting and flush end face (Precision Cutting & Deburring): Introduce precision CNC water jet cutting or stress-free micro-cutting, the notch is flush and the same roundness is good. It undergoes proprietary ultrasonic deep degreasing and drying, and conducts high-fold microscopic examination (100% dead-angle-free end face and internal hole flash inspection) under a 100-level Clean Bench (Clean Bench).

IV. Cross-border cutting-edge applications (High-Value Market Applications)

Bio-medicine and interventional Medical Devices (Medical Devices & Implants): as external sheaths or conductive channels in cardiac pacemakers, micro-pump valves, and nerve electrodes; Under X-ray fluoroscopy, the high density of pure tantalum makes it an excellent developing/marker band.

High-Performance Liquid Chromatography (HPLC): Widely used as high-pressure fluid introduction tubes, sampling needles, and column connection tubes in high-performance liquid chromatographs, gas chromatographs, and mass spectrometers (LC-MS). Its strong corrosion resistance to strong acids/alkalis completely eliminates the interference of metal ion pollution on the detection baseline.

Semiconductor and chemical microfluidics (Semiconductor Microfluidics): as a precise micro-dosage distribution channel for high-end wet etching and high-corrosive reagents (such as strong concentration water king and hydrochloric acid) in etching processes.