... property Save material High strength Light weight C channel steel Our C channel steel has a good quality ,90 degree angle .The ... when used as purlin ,it will reduce weight, the roof steel quantity, both economic and efficiency.And no doubt it is ... the best choice of purlin in steel structure.2 application:C channel steel can be used as building purlin, wall ... 5200*50*20*2.5220*50*20*2.5 C type steel