Cold rolled steel C-beams: Standard: AISI, ASTM, BS, DIN, GB, ... days after receiving the LC or TT prepaySpecifications1)Commodity:c shape steel channels 2)Material: Q235B,SS400,S235JR ... days after receiving the LC or TT prepaySpecifications1)Commodity:c shape steel channels 2)Material: Q235B,SS400,S235JR ... date: 30 days GB STANDARD HOT ROLLED ALLOY C-CHANNEL STEEL BEAMSIZE (MM)THEORETICAL WEIGHT (KG/M ...