The invention discloses a cladding layer of a valve sealing surface. The
alloy powder of the cladding layer comprises iron,
chromium,
nickel,
molybdenum,
boron,
silicon, carbon,
tungsten and vanadiumelements, wherein the iron is used as a main body, the content of the iron is more than 50%, the content of the
chromium is more than 15%, the content of the
boron is 2.0%, and the content of the
silicon is 2.0%; the preparation technological process of the
alloy powder comprises the steps of burdening,
smelting, atomizing,
drying and screening; and the cladding method of the cladding layer adoptsa
laser cladding process, cladding
lap joint is carried out on the valve sealing surface, and the thickness of the cladding layer is 1000-2000 microns. According to the obtained cladding layer,
cobalt-free
alloy with iron and
chromium as main bodies is utilized, the
wear resistance, the
impact resistance, the
corrosion resistance and the like of the sealing surface of the
ball valve are more excellent through a specific alloy
powder preparation process and a cladding method of the cladding layer, the quality of the valve sealing surface is improved, and the service life of the valve is prolonged.