The importance of seamless steel pipe surface treatment

Seamless steel pipe surface treatment is one of the important factors in the selection of steel pipe anti-corrosion application life limit, and it is the standard for the robust integration of anti-corrosion layer and seamless steel pipe.

According to the scientific research organization certification, the life limit of the anti-corrosion layer in addition to the coating type, coating quality and engineering construction natural environment and other factors, the impact of the surface treatment of seamless steel pipe on the anti-corrosion layer life limit is about 50% 20%, therefore, it should not be optimistic in accordance with the anti-corrosion layer standard for seamless steel pipe surface, continuous exploration and summary, Continuous improvement of seamless steel pipe surface treatment.

Seamless steel pipe cleaning application of organic solvents, solvents to clean the surface of stainless steel plate to remove oil, vegetable grease, dust, lubrication fluid and similar organic compounds, but it can not remove stainless steel plate surface rust, oxide, solder, etc., so in the anti-corrosion production only as an auxiliary way.

The anti-rust treatment of seamless steel pipe is mainly applied to the surface of stainless steel plate by grinding and polishing steel brush and other items, which can remove loose or warped oxide skin, rust, welding nodules and so on. Manual items rust treatment can reach Sa2 level, driving items rust treatment can reach Sa3 level, if the surface of the stainless steel plate adheres to strong zinc ash, the effect of the item rust treatment is not ideal, can not reach the anchor grain depth of the FRP corrosion protection provisions.

The pickling passivation of seamless steel pipe is generally solved by organic chemistry and electrolysis. The corrosion protection of steel pipe only uses organic chemical pickling passivation, which can remove oxide, rust and old coating, and sometimes it can be used as a re-solution after shot blasting. Although chemical water treatment can make the surface surface reach the necessary cleanliness and surface roughness, its anchor pattern is shallow, and it is easy to constitute environmental pollution to the natural environment.