... performance 3.Good straightness 4.Reliable performance C/Z type channel steel purlins features : Standard:AISI, ASTM, BS, DIN, GB ... :Q215,Q235,A36,SS400,SS540Commoditystructural steel C/Z type channel steelShapeC/Z ChannelModel Numberh:80mm-400mm,w:40mm-80mmPerforated Or ... purlin and wall beam of steel structure buildingC/Z type channel steel purlins advantage:(1). Design according to customers’ ...