Galvanized square pipe four government has galvanized rectangular tubes and galvanized rectangular tubes into two categories. Galvanized square tubes have wet, dry, lead, zinc, oxidation-reduction method. The main difference between the different methods of hot-dip galvanized steel pickling after cleaning, the method used to improve the activation of galvanized pipe surface quality. Production is now mainly used dry and redox method, which is characterized in Table. Galvanized zinc coating surface is very smooth and dense, uniform organization; has good mechanical properties and corrosion resistance; zinc consumption 60% to 75% lower than the hot-dip galvanizing. Galvanized technically have some complexity, but for single-sided coating, different inner and outer surfaces coated galvanized coating thickness sided rectangular tube, and thin-walled tube galvanized mused must use this method. [1000-pipe to introduce you to the star product - galvanized square and rectangular tube] 1, manufacturing methods: ① general boiler tube using the temperature below 450 ℃, homemade pipe is mainly used on the 10th, the 20th hot-rolled carbon steel pipe or cold drawn tube manufacturing. ② high-pressure boiler tubes often in high temperature and high pressure conditions used in the role of high temperature gas pipe and water vapor galvanized rectangular tube 20 * 50, oxidation and corrosion will occur. Require durable steel with high strength galvanized rectangular tube 30 * 40, high resistance to oxidation resistance, and good organizational stability. 2. Purpose: ① general boiler tube is mainly used to manufacture water wall tube, boiling water pipe, superheated steam pipes, superheated steam locomotive boiler tubes, and large, small pipe and brick arch pipe. ② high-pressure boiler tube is mainly used to manufacture high and ultra-high pressure boiler superheater tubes, reheater tubes, airway, the main steam pipe. 3. Press the type of boiler tubes are exposed to high temperature performance is divided into general boiler tubes and high-pressure boiler tubes. Whether general or high-pressure boiler tube boiler tubes can be divided according to their use requirements of different kinds of steel pipe. 4. Specifications and appearance quality (1) GB3087-82 "low-pressure boiler seamless steel" requirement. Various structural specifications of galvanized steel boiler with a rectangular tube 25 * 50, diameter 10 ~ 426mm, a total of 43 kinds. Wall thickness of 1.5 ~ 26mm total of 29 species. However, superheated steam locomotive boiler tubes, opium pipe, otherwise small pipe diameter and wall thickness and brick arch tube. (2) GB5310-95 "high-pressure boiler seamless" hot-rolled tube outer diameter of 22 ~ 530mm, wall thickness ranging from 20 ~ 70mm. Cold drawn (cold) tube diameter 10 ~ 108mm, wall thickness ranging from 2.0 ~ 13.0mm. (3) GB3087-82 "low-pressure boiler seamless steel" and GB5310-95 "high-pressure boiler seamless steel pipe" requirement. Appearance quality: internal and external surfaces of the steel pipe does not allow cracks, folding, rolling, folding, scarring, separation and hairline. These defects should be completely removed. Clear Q345B beam depth [2] shall not exceed the nominal wall thickness of the negative bias, its clean-up at the actual wall thickness of not less than the minimum allowable. Galvanized rectangular tube 25 * 40, galvanized rectangular tubes, galvanized rectangular tube with a 1000-by Tianjin Pipe Company Limited. Thousands of Tianjin Steel Pipe Co., Rong (www.tjqre.com) (www.tjqre.com) strong, credible, in Tianjin steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the 1000-pipe and you hand in hand into the brilliant, for a better future!