Definition and production of high-pressure boiler tube high-pressure boiler pipe is mainly used to manufacture high pressure steam boiler and above pipelines with high-quality carbon steel, alloy steel and heat-resistant stainless steel seamless pipe, boiler pipe through which the party work at high temperatures and pressures, the tubes at high temperature flue gas and water vapor effect of oxidation and corrosion will occur, thus requiring a durable steel with high strength, high oxidation resistance, and good organizational stability, the use of steel numbers are: high quality carbon steel structural steel have 20G, 20MnG, 25MnG; alloy steel steel 15MoG, 20MoG, 12,15,12Cr2MoG, 12,12Cr3 etc; heat-resistant stainless steel used high-pressure boiler pipe except 1Cr18Ni9,1Cr18Ni11Nb ensure that the chemical composition and mechanical properties of thick-walled seamless steel pipe outside, hydrostatic testing done by the root, to be flaring, flattening test. Steel to heat treatment delivery. In addition, finished steel microstructure, grain size, decarburization there are certain requirements. Is a seamless boiler tubes. A method of manufacturing the same seamless steel pipe plant, but the steel used in the manufacture of steel, there are strict requirements. Depending on the temperature level is divided into two general boiler tubes and high pressure boiler pipe. Specifications and appearance quality "low-pressure boiler seamless steel" requirement. Various structural boiler pipe size, 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. "High-pressure boiler seamless" hot-rolled tube outer diameter of 22 ~ 530mm large diameter seamless steel pipe, 10 ~ 108mm, wall thickness 2.0-13.0mm wall thickness ranging from 20 ~ 70mm cold drawn tube diameter. "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 depth 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 allowed by the small diameter seamless steel pipe seamless steel pipe _ _ saponification Weifang seamless steel pipe industry by virtue of Liaocheng Ltd. . Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead virtue of Industry and you work into the brilliant, for a better future!