PURPOSE: To reduce the production cost and to improve the yield by inserting a cast iron material into the recessed part of a forged steel made base metal and calking the cast iron material to the base metal via a rotary forging.

CONSTITUTION: A composite plate disk part is composed of, the steel made base metal 11 subjected to a forging and machining and the sliding part 12 consisting of a cast iron material. The cast iron material 12 is first set to the recessed part 14 of the disk base metal 11 and a rotary forging is performed. In this case, the rolling reduction allowance δ set prior to the working is crushed, the cast iron material 12 is calked mechanically into the base metal 11 and a claw 13 is simultaneously formed. The final product is obtd. by machining the sliding face of a cladded part. Since the cladding is performed with a small sized and simple rotary forging machine the production cost is reduced, and owing to the generation of a casting defect being prevented the product yield is improved.