Longkou Jingyi Industry and Trade Co., Ltd. was the first enterprise in Longkou City to work on the production of the powder metallurgy. With the decades of experience in the production of the powder metallurgy, it owns Longkou Jingyi Powder Metallurgy Co., Ltd. and Longkou Jingyi Heat Treatment Center.It has over 100 sets of production equipments and over 20 automatic powder metallurgy rolling mills (from 6 tons to 315 tons). It mainly produces copper-based, iron-based and stainless steel powder metallurgy products and all kinds of high-strength powder metallurgy structural parts, which are widely used in textile machinery, electric power tools, auto parts, household appliances, hardware tools, wood-working machinery, printing machinery, etc. The products are exported to Japan, the USA, India, Singapore, etc.The heat treatment center has automatic vacuum furnaces, mesh belt furnaces, carburizing furnaces, high-frequency furnaces, etc. It mainly supplies heat treatment processing to the major auto parts factories in Longkou City and the surrounding cities and the heat treatment to the metallic sintered products in its own factory. 龍口精益工貿有限公司，同時擁有龍口精益粉末冶金有限公司和龍口市精益熱處理中心。是龍口市最早從事粉末冶金生產的企業, 有幾十年的粉末冶金生產經驗.企業主要生產設備100多臺套,全自動粉末冶金軋機6噸--315噸20多臺.主要生產各種銅基、鐵基、不銹鋼粉末冶金制品，各種高強度粉末冶金結構零件，廣泛應用于紡織機械、電動工具、汽摩配件、家用電器、五金工具、木工機械、印刷機械等行業。產品出口日本、美國、印度、新加坡、等國家。熱處理中心主要為龍口市及周邊縣市各大汽車配件廠提供熱處理加工和本廠粉末冶金件的熱處理,有全自動真空爐.網帶爐.滲碳爐.高頻爐等設備.