... , conform to the world standard, can be used for a variety of purposes. standredGBStandardGB/T8162, GB/T8163, GB/T3639, GB/T 3087GradeQ195-Q345Thickness0.5 ... , conform to the world standard, can be used for a variety of purposes. standredGBStandardGB/T8162, GB/T8163, GB/T3639, GB/T 3087GradeQ195-Q345GradeQ195, Q215Thickness0 ...