... used steel grades and performance of steel:· Carbon structural steel: Q195, Q215, Q235, Q255, Q275, etc.· High-strength low-alloy structural steel ... do)Crane: 5T,10T,15T,ect.Bolt: Foundation bolt(M24,Q235), High strengthen bolt(M20X70) , Normal bolts(M16x50;M12X30)Terms:Payment ...