Abstract: High-chromium cast iron has been used in oil field as liner oxnud pump
ar home since lg7p}s, Its working life is much longer than single-layer
metal liner with hardening treatment, In order to lengthen the working life
of high-chromium cast iron and improve the present ,process,an analytical
study is made of doublelayer metal liner, which has been used in field and
has longer life, The metallograph analysis， the surface topography analysis
under scanning electron microscope and the wear debris analysis in field
mud are included, The result shows that the wear mechanism is that fatigue
spalling plays the main role, brittleness collapse the second role,and plastic
deformation, micro cutting and corrosion, etc, also play an important role,
From this， improvements on the existing process have been presented