① with the world symbols of chemical elements and their symbols to indicate the chemical composition channel specifications, using the Arabic alphabet to indicate content: Such as: China, the Russian 12CrNi3A② fixed number of digits to indicate the types of steel series or digital; such as: the United States, Japan, 300 series, 400 series, 200 series; ③ sequence composed of the Latin alphabet and numbers, only that purpose. A. Common channel and sub channel light channel. Hot-rolled channel steel specifications 5-40 #. After the agreement between the supply of hot alternative channel specifications 6.5-30 #. Channel mainly used for building structure, vehicle manufacturers, other industrial structures and fixed disk cabinets. Channel geometry incorrect main manifestations are: collapse angle, legs spread and legs and the like. See the corresponding standards in this section, "7" listed GB707-88 (hot rolled channel size, shape, weight and tolerances) and JIS G3192-94 (hot-rolled steel shape, size, weight and Tolerance). Channel surface quality and geometry tolerances have specified in the standard. General requirements for the use of the surface may not be harmful defects exist channel model, not a significant reverse channel, the provisions channel waves bend (camber) allowed values ??and specifications channel cross-sectional shape parameters (h, b, d Numerical t, etc.), tolerance values. Channel theoretical weight, Chin Bo commerce (online consultation), Hefei, Bengbu channel provided by the exhibition Bo Trading Company. Hefei Show Bo Trading Company (www.hfzhanbo.com) (www.hfzhanbo.com) is Hefei, steel leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customers needs. In the exhibition of Commerce Bo leadership with the staff warmly welcome all inquiries negotiations to create the exhibition of Commerce Bo better future.