SS 400 contruction u channel 1)length: max 12m 2)grade: ... ,Q345 3)standard:BS,GB,JIS 4)contact person:karen SS 400 contruction u channel nameu channel,steel channel,hot rolled ... ,SGS,BVStandardAISI,ASTM.BS,DIN,GB,JIS quality we can supply customers' with different specifications of the highest quality and lowest ...