Bearing Balls
Bearing Balls. In accordance with GB 308-89,China's NationalStandard.Widely used in 27 provinces of China and being exported to U.S.A.,U.K.,Korea,Japan,Germany and Southeast Asian countries.
Valve Seats and Valve Balls
Valve Seats and Valve Balls,made of new materials 440C and 440A,developed by China Metal Research Institute and Petroleum Exploration &Development Institute.High wear-resistance,high corrosion-resistance and long service life.Especially applicable for petroleum and chemical industries.
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