... :Tempered Martensite HRC:40-50 My company has been engaged in the development of agricultural machinery and equipment for the blade ... plowing, ridge knife, knife stubble, reclamation knife, knife tillers, disc harrow, disc plows piece, spring-tooth, etc., and to map non ... ! rotary tiller blade, tractor parts, s-tine, spring tine, tine harrow, mower blade,cutter plow, plow point,cultivator shovel plow