Surface Treatment Process

Proven and refined high-efficiency surface treatment processes

Our self-developed automatic polishing technology makes the stability of polishing quality better guaranteed, while reducing the cost of polishing and improving the speed of polishing.

During years of practical experience, HOPE Machinery has optimized the following key elements for its EP pipe fittings:

1. Electrolytic polishing time
2. Temperature of the electrolyte solution
3. Cathode amplitude and position are related to the product quality
4. Acid-base level of the solution

HOPE strictly abides by ASME BPE fittings standard, and forbids electrolysis time lower than BPE requirements.

1.More beautiful on the outside, with enough brightness on the inside
2.RA meets the standard, less thick wire and more bright wire
3.Thicker EP layer ensures better corrosion resistance
4.Higher Chromium concentration leads to stronger corrosion resistance.

The following table shows how HOPE exceeds ASME BPE quality requirements.
✔ Thickness of the electropolished layer, measured in angstroms.

The thicker the layer, the more contamination-free and corrosion-resistant the part will be.
✔ Cr/Fe: The ratio of chromium/iron.

The higher this ratio, the higher the corrosion resistance.