Galvanization steel tube surface is hot dip galvanized layer orelectric plating of welded tube. Galvanized steel can increase thecorrosion resistance, prolong service life. The use ofgalvanization is very wide, except for water, gas, oil and lowpressure flow of the general line pipe outside, is also used forthe oil industry especially the ocean oil pipe, oil pipeline,chemical coking equipment oil heater, condensing cooler, coal washthe oil fractions exchange device is used for tube, and pipe,mining tunnel approach of supporting frame with pipe, etc.