Due to defects in galvanizing technology, factory wholesale channel, zinc layer surface sometimes particulate zinc projections, channel wholesale product, which is dross particles affect the appearance of the coating, but does not affect the corrosion resistance. In recent years, mostly due to the steel silicon killed steel, prone to gray matte coating, namely zinc plated surface is not shiny and gray, severe dark gray, which is an iron-zinc alloy layer caused by the exposed surface against atmospheric Corrosion has no effect. Plus nickel and zinc plating process change may reduce or eliminate the appearance of dark zinc plating bath. However, the silicon content is particularly high in low-alloy steels such as high strength steel, at home and abroad can not completely eliminate this phenomenon. Channel specifications mainly used height (h), leg width (b), waist thickness (d) of equal size to represent the current domestic channel sizes from No. 5-40, the corresponding height of 5-40cm, Hefei channel Wholesale, the surface quality and tolerances are specified geometry in the standard. General requirements There shall be no surface defects harmful to spend, do not have a significant twist, the provisions channel waves bend (camber) allowed values ??and specifications channel surface shape parameters (h, channel wholesale businesses, b, d Numerical t, etc.), tolerance values. Channel wholesale manufacturers, exhibition of Commerce Bo (certification), Hefei wholesale channels provided by the Hefei 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.