1. BA tube: BA tube is a type of stainless steel tube with high surface treatment finish, mainly used in industries such as food, pharmaceuticals, and cosmetics that require high surface smoothness.

2. Instrument tube: Instrument tube is a type of pipeline used in instrument and meter systems, requiring high accuracy, stable pressure, and accurate temperature control, mainly applied in industries such as chemical, petroleum, pharmaceuticals, and food.

3. Heat exchanger tube: Heat exchanger tube is a type of tube used for heat transfer, applied in mechanical equipment in fields such as chemical, pharmaceuticals, food, metallurgy, and electric power.

4. High-pressure tube: High-pressure tube generally refers to the tube used in high-pressure pipeline, mainly applied in high-pressure pipeline systems of industries such as oil and gas transportation, chemical, pharmaceuticals, and electric power.

5. Nickel alloy tube: Nickel alloy tube is mainly used in pipeline systems under special environments such as high temperature, corrosion resistance, and oxidation resistance, mainly applied in fields such as aviation and aerospace, nuclear engineering, chemical, electric power, and petroleum.

In summary, these tubes have their unique characteristics and application scope, mainly applied in industries with high requirements, and have become indispensable components of modern industry.