9# mine i beam: mining i beam is commonly referred to mine steel, it is a type of mine steel, mainly used for the support of mine tunnel, flange width, height and thickness. 1, standard: YB/T24-1986/2 2, size specification: Type: 9# Heigh: 90±2.0 Leg width: 76±2.0 Web thickness: 8±0.6 Material: 16Mn Annotation: 1, The outer edge of the i-steel shall not be more than 2.4% of the width of the legs. 2, The bending of the steel shall not be greater than 1.0mm. 3, The eccentricity of the steel shall not exceed 2% of the width of the legs. Degree of eccentricity: =b2-b1/2. 4, The bending degree of the steel shall not be greater than 3mm, total curvature must not exceed 0.3 percent. If you are intrested in our products please visit our website