High Purity Tubing

Common materials include 304 and 316L stainless steel. For better performance (such as stronger corrosion resistance, higher cleanliness, and adaptability to extreme environments), Hastelloy (e.g., C276, B2), Monel 400, and titanium and titanium alloys (Gr.1, Gr.2) can be considered.

High purity tubes mainly include AP（Annealed and Pickled）tubes, EP（Electro-Polished） tubes, MP（Mechanical Polished）tubes, and BA（Bright Annealed）tubes.

Common outer diameter sizes: 3.175 to 50.8 mm, Wall thickness: 0.5 to 5 mm

1)AP Grade:Mother pipe→cold drawing→annealing→passivation→inspection→super machanical cleaning

2)BA Grade:Mother pipe→special cold drawing→bright annealing→passivation→inspection→super machanical cleaning

3)MP Grade:Mother pipe→special cold drawing→bright annealing→mechanical polishing→passivation→inspection→super machanical cleaning

4)EP Grade:Mother pipe→special cold drawing→bright annealing→mechanical polishing→electro polishing→passivation→inspection→super machanical cleaning

Dimensional accuracy: Precision tubes have extremely small tolerances (±0.02~0.1mm), while ordinary tubes have wider tolerances (±0.5~1mm).

Surface quality: Precision tubes have high surface finish (Ra≤1.6μm) and no impurities; ordinary tubes are rough (Ra≥3.2μm) and prone to scale.

Performance: Precision tubes undergo cold working + heat treatment, resulting in stable performance and high pressure resistance; ordinary tubes have large performance fluctuations and are suitable for low pressure.