Can the steering gear rack bushing be made of iron?

Steering gear rack bushing cannot be made of iron. Because the function of the steering gear rack bushing is to increase the force transmitted by the steering wheel to the steering transmission mechanism and change the transmission direction of the force, it needs flexibility and low friction to support and fix the rack in the steering gear, while the iron is relatively heavy, which is particularly laborious to turn and will only increase the burden of the rack. At present, polyoxymethylene or powder metallurgy plastics are widely used, but the friction coefficient is relatively large, it is not wear-resistant, the compressive strength is not high, and the cost is relatively high. According to relevant information, a friction coefficient is being invented.