... 4. Perfect Service 5. On Time Delivery Our advantage:1:steel grade:1018,1020,1045,4140,4130,4340,4330,8620,9840 ... drawn,rolling and so on.3:application:structural steel bar, die steel bar, tool steel bar and so on.4.Excellent after-sales ... . Provide users with cutting, turning, cold drawn, quenching and tempering, solid fusion heat-treatment on rough machining.