Q. Are ductile iron valves and cast steel valves of the same type or one is better than another?

Answer

The primary difference between ductile iron valves and cast steel valves arises in matters related to weldability and abrasion. Ductile iron valves are known for their tensile strength, elongation, and higher abrasion tolerance than cast steel, and it is used in friction wear mechanisms. Concerning weldability, cast steel valves are better than ductile iron valves.