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, the surface quality and geometry tolerances have specified 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 stainless steel channel model, b non-standard groove value steel model, d channel standard model, t, etc.), tolerance values. Hot-rolled channel average leg thickness to allow deviation of ± 0.06t, bend deflection should not exceed 0.15d, channel leg of the outer edge of the slope, large leg not to 1.5% b, the legs no more than 2.5% b groove steel model, the leg-side, shoulder passivation can not make a diameter equal to the rod by 0.18t; the channel curvature per meter of not more than 3mm, total curvature is not greater than 0.3% of the total length, and no obvious twist. Several points channel size inspection method is as follows: 1. Check the height to waist height prevail, checking leg width shall be exempt from the impact uneven waist, bend deflection check with a ruler and a feeler gauge, check the channel leg side, Shoulder passivation measuring rod model and can not be measured so that the diameter of the rod is equal to 0.18t by passivation site. Non-standard channel models, Ma'anshan channel model, Chin Bo commerce channel sales price offered by the Hefei exhibition Bo Trading Company. Hefei Show Bo Trading Company (www.hfzhanbo.com) strong, credible, in Hefei steel industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement will lead the development of innovative ideas of Commerce Bo into the brilliant and you work for a better future!