Surface quality and geometry allowable deviations of channel steel in the standard there are specific provisions. The general requirements of the surface shall not be harmful to use, there shall not be significantly reversed, the provisions of the corrugated channel steel to allow the value of the corrugated steel plate and the shape of the various parameters of the relevant parameters of the value of tolerance. There also need Scaffold Steel Plank in building process.Channel geometry is not correct the main performance is: angle, leg expansion and leg and so on
