h-type steel 1..Material:Q235 SS400 S235JR ST37-2 Q345 2.Size: ... .Flat Steel BarCarbon Structural Steel,Alloy Structural Steel ,Spring Steel 2.Round Steel BarCarbon Structural Steel,Alloy Structural Steel,Spring Steel,Carbon Tool Steel 3.Square Steel BarCarbon Tool Steel, Alloy Structural Steel ... ,SM490A,SM490B,S235JIR,S355JR,ASTM A36,ASTMA572 GRADE42-65 h-type steel