The 12# mine steel arch is made of mine i beam, the material of the 12# mine steel arch is Q345B,
the Application: It is mainly used in mine roadway, secondary support of mine roadway and supporting support for the tunnel.
Specification: T chanel support, arch support
Size: 12#
Material: Q345B
Characteristic: High pressure, long support time, easy to install, etc.
1. The outer edge of the i-steel shall not be more than 2.4% of the width of the legs.
2. The bending deflection of the i-steel shall not be greater than 1.0mm.
3. The degree of eccentricity of i-steel shall not be more than 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.
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