... performance 3.Good straightness 4.Reliable performance C/Z type channel steel purlins features : Standard:AISI, ASTM, BS, DIN, GB, ... JISGrade:Q215,Q235,A36,SS400,SS540Commoditystructural steel C/Z type channel steelShapeC/Z ChannelModel Numberh:80mm-400mm,w:40mm-80mmPerforated Or ... : can be used for several times and can be recycled(6). Shorter construction period, longer using time(7). High strength ...