Specifications and appearance quality "low-pressure boiler seamless steel" requirement. Various structural boiler pipe size, diameter 10 ~ 426mm grl15 precision light pipe, 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, wall thickness of 20 ~ 70mm tube diameter 10 ~ 108mm cold drawn precision light pipe wall thickness ranging from 2.0-13.0mm. "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 negative deviation 35 # precision light pipe, its cleanup at the actual wall thickness of not less than special steel pipe 16mn minimum allowable uses for the bridge as "16Mnq", dedicated automobile frames steel for "16MnL", a special steel pressure vessel is "16MnR". Standard GB / T8162-2008 (structural) GB / T8163-2008 (transmission fluid with) GB6479-2008 (high pressure chemical fertilizer equipment, seamless steel pipe) 16Mn steel weight calculation formula: [(OD - Wall Thickness) * Thickness] * 0.02466 = kg / m (weight per meter) steel is to rely on such adjustments carbonaceous (C) amount to improve the mechanical properties of the steel, and therefore high-precision light pipe, according to the level of carbon content, these steels can be divided into as: low carbon steel - carbon content is generally less than 0.25%, such as 10, 20 steel and the like; medium carbon steel - carbon content generally between 0.25 to 0.60%, such as 35, 45 steel; high-carbon steel - - generally greater than 0.60% carbon content. Such is generally not used in the manufacture of steel pipe. Precision light pipe _ virtue of Industry (certified) _ precision light pipe is provided by virtue of Liaocheng Industry Co., Ltd. Liaocheng virtue Pipe Co., Ltd. (www.meidegc.com) (www.meidegc.com) (www.mdwfg.com) (www.mdggc.com) Shandong Liaocheng, steel leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Industry leaders in the United States and Germany with the staff warmly welcome all inquiries negotiations to create the virtues pipe industry a better future.