A: The tie rod and rack end is made of 20/35 seamless steel tube. After forging, the shape is normalized. The compression spring is fired with 70 steel live 65Mn steel wire and heat treated. The screw plug is made of 35 or T12 steel. The ball pin is made of 18CrMnTi/15Cr or 20Cr steel. Carburizing the head and the ball seat surface
