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.
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