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Welded Capillary Stainless Steel Tube: A Comprehensive Guide
Introduction
Welded capillary stainless steel tubes are highly specialized products used in various industries, including medical, pharmaceutical, and chemical processing. This article aims to provide a comprehensive guide to welded capillary stainless steel tubes, covering material, specification, key features, chemical composition, mechanical properties, physical properties, process performance, steel grade, application, and possible alternative grades.
Material and Specification
Welded capillary stainless steel tubes are typically manufactured using high-quality stainless steel grades such as 304, 316, or 321. These tubes are available in various sizes with outer diameters ranging from 0.5mm to 20mm and wall thicknesses ranging from 0.05mm to 2mm. The length of the tubes can be customized according to specific requirements.
Key Features
High corrosion resistance
Excellent heat resistance
Precise dimensions and tolerances
Smooth and uniform surface finish
Strong and durable construction
Suitable for high-pressure and high-temperature applications
Easy to clean and maintain
Welded construction for enhanced strength and integrity
Chemical Composition
The chemical composition of welded capillary stainless steel tubes varies depending on the grade of stainless steel used. Below is a table presenting the typical chemical composition of commonly used grades:
| Grade | C% | Si% | Mn% | P% | S% | Cr% | Ni% | Mo% |
| 304 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 | - |
| 316 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 |
| 321 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 17.0-19.0 | 9.0-12.0 | - |
Mechanical Properties
Welded capillary stainless steel tubes possess excellent mechanical properties, making them suitable for demanding applications. Below is a table presenting the typical mechanical properties of commonly used grades:
| Grade | Tensile Stremgth(MPa) | Yield Strength(MPa) | Elongation(%) |
| 304 | 515-730 | ≥205 | ≥40 |
| 316 | 515-690 | ≥205 | ≥40 |
| 321 | 515-730 | ≥205 | ≥40 |
Physical Properties
Welded capillary stainless steel tubes possess favorable physical properties that contribute to their exceptional performance. Below is a table presenting the typical physical properties of stainless steel tubes:
| Property | Value |
| Density (g/cm³) | 8.0-8.1 |
| Melting Point (°C) | 1398-1446 |
| Specific Heat (J/kg·K) | 500-600 |
| Thermal Conductivity (W/m·K) | 14-19 |
| Electrical Resistivity (µΩ·cm) | 72-78 |
Process Performance
Welded capillary stainless steel tubes are fabricated using advanced manufacturing processes. The welding methods employed ensure high-quality and defect-free products. These tubes exhibit excellent resistance to corrosion, heat, and pressure, making them suitable for critical applications in various industries.
Steel Grade and Application
Different steel grades are selected based on specific application requirements. The most commonly used stainless steel grades for welded capillary tubes include 304, 316, and 321. These tubes find applications in numerous fields, including:
Medical devices and equipment
Pharmaceutical processing
Chemical processing
Precision instruments
Chromatography capillaries
Gas and liquid delivery systems
Possible Alternative Grades
While 304, 316, and 321 are widely used, depending on the specific application, alternative grades such as 310, 904L, or 2205 stainless steels may be considered. These alternative grades offer varying properties, including higher corrosion resistance or improved strength, to cater to specific requirements.
310 stainless steel: Enhanced high-temperature resistance
904L stainless steel: Superior corrosion resistance in aggressive environments
2205 stainless steel: Excellent strength and resistance to chloride stress corrosion cracking
We take high quality and high efficiency as the goal and customer satisfaction as the tenet, constantly optimizing and perfecting our High Quality 201 304 316 Factory Micro Bright Annealing Stainless Steel Capillary Tube / Tubing / Pipe. Our company not only has a strong production capacity to ensure sufficient inventory, but also customizes and develops ultrasonic products in different application fields according to customer needs. Our company always adheres to the tenet of 'survive by quality and development by technology', relying on the goal of 'win-win cooperation and common development', and wholeheartedly produces high-quality products for new and old users, which are sold well all over the world.
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