Shandong Bouna Precision Metal Co., LTD takes silicon sol investment casting process and produces various metal parts, such as mechanical parts, pump shell, impeller, valve body, exhaust pipe for auto parts, high-speed railway accessories, marine hardware, building hardware, hydraulic pneumatic tools, measuring instruments and equipment accessories, food machinery parts, heat treatment equipment. Bona has produced more than 10,000 kinds of items with more than 300 kinds of materials, such as carbon steel, stainless steel (Austenite, Marten site, ferrite, duplex, precipitation hardened ), high manganese steel, heat resistant steel, tool steel, nickel-based alloy, copper alloys, Aluminum alloys. Annual output is 600 tons of castings.