... channel bar 2/Standard ASTM, GB, JIS 3/Grade Q235 SS400, ASTM A36 Gr.B 4Application machine struction ,boiler,boat,etc U channel ... barproduct name: Channel barstandard: JIS ,GB, ASTMGrade:SS400,Q235B A36 Gr.BSIZE ... ,then we could make the mold for production also. U channel bar