75*40 steel channel 1.size:50*37-400*100 2.length:6m-12m 3.standard:ss400,europen,A36,s235jr 75*40 steel channel Advantage: a.) It has thin wall, light weight, cross-section excellent performance, high strength, and so on.b.) Compared with the traditional channel, c beam can save 30% of the same strength of materials. Applications:a.) Steel building purlin, wall beam;b.) Self-assembled into ...