... steel. 4.In stock. Bi-metal liners for mud pump Kunhec liners can meet the API manufacture standards,combining ... at home and abroad, the using time of our liners are 800 hours in high pressure, sediment concentration ... , this time is 2-3 times than ordinary liners, but the price is less 1.5-1. ... 7 times than ordinary liners. Features• Chrome content is 28. • wear resistance, ...