Description
Product details
The engine valve made up of two different metals are knows as bi-metal Valves. This is done using friction welding process. Exhaust valves are especially made from bi-metal. Austentic Steel which is having heat resistance and corrosion resistance properties, is used at the head while the stem is made from Martensitic Steel which have high tensile strength and abrasive wear resistance property. This technique is mainly used in high stressed exhaust valves. Valve made by joining together two different valve materials by friction wielding wherein high hot hardness alloy steel (austenitic steel) is used at the head and the stem made from a upright mechanical properties steel (martensitic steel). In this way a better usage of the properties of each material is achieved, high temperature corrosion resistance in the austenitic stainless steels of the head, and high tensile strength and abrasive wear resistance in the martensitic stainless steel of the stem. This technique is used in medium to high stressed exhaust valves and in high stressed intake valves.
