Find HS Code and trade information for 变径

变径

变径 (Biànjìng), often translated as variable diameter tubing or reducing tubing, refers to tubing with a continuously changing inner diameter along its length. This characteristic distinguishes it from tubing with a constant bore.

Material

变径 tubing is manufactured from a variety of materials, selected based on the intended application. Common materials include:

• Stainless Steel: Offers excellent corrosion resistance and is frequently used in medical devices, chemical processing, and instrumentation. Grades like 304 and 316 are prevalent.
• Carbon Steel: Provides high strength and is suitable for applications requiring robust mechanical properties, often with protective coatings to prevent corrosion.
• Titanium: Known for its high strength-to-weight ratio and biocompatibility, used in specialized medical and aerospace applications.
• Nickel Alloys: Exhibit exceptional corrosion resistance and high-temperature strength, employed in demanding chemical and high-temperature environments.
• Polymers: Materials like PTFE (Teflon), PEEK, and polypropylene are used for applications requiring chemical inertness, flexibility, and low friction.

Purpose

The primary purpose of 变径 tubing is to facilitate connections between components with differing tube diameters without the need for separate adapters or reducers. This simplifies assembly, reduces potential leak points, and can minimize flow restrictions.

Function

变径 tubing functions by smoothly transitioning from one inner diameter to another. This gradual change in diameter minimizes turbulence and pressure drop compared to abrupt reductions using fittings. The tapering profile can be linear, exponential, or follow other specific curves, depending on the manufacturing process and application requirements.

Usage Scenarios

• Medical Devices: Used in catheters, fluid delivery systems, and minimally invasive surgical instruments where precise fluid control and smooth transitions are crucial.
• Analytical Instrumentation: Employed in chromatography, mass spectrometry, and other analytical equipment for sample delivery and fluid handling.
• Chemical Processing: Utilized in reactors, mixers, and fluid transfer lines where corrosion resistance and precise flow control are essential.
• Hydraulic Systems: Used in specialized hydraulic applications requiring smooth flow transitions and reduced pressure loss.
• Automotive: Found in fuel lines, brake lines, and cooling systems.

Common Types

• Conical: Features a linear taper, providing a simple and cost-effective solution for many applications.
• Exponential: Exhibits an exponential taper, offering smoother flow transitions and reduced turbulence, particularly useful in high-precision applications.
• Parabolic: Utilizes a parabolic profile for optimal flow characteristics and minimal pressure drop.
• Custom Profiles: Tailored tapers designed to meet specific application requirements, often manufactured using specialized forming techniques.
• Hypodermic Tubing: A specialized type of 变径 tubing with very small diameters, used in needles and syringes.

根据您提供的“变径”信息，以下是根据参考资料找到的相关HS编码及其详细说明：

• 8548000000：
  • 85：电气机械设备及其零件（第85章）。
  • 48：电气机械设备的零件，未另列于本章。
  • 000000：未具体指定或包含在其他地方的机械或器具的电气零件。

该HS编码适用于未在其他地方明确列出的机械或器具的电气零件。根据参考资料，该编码的基础关税为0.0%，加征关税为25.0%，2025.4.2后加征关税为30.0%，总税率为55.0%。

根据提供的参考资料，与“变径”相关的HS编码选项有限，仅找到以上1个。