Production material :65Mn(65Mn Spring steel). The range thick is 2-3mm. quote high frequency heating treatment, The surface treatment including rust preventive oil,stoving varnish,blacking,zinc galvanized,plastic spray. Main application : harvester blade used for combine harvester, swather , lawn mower , straw chopper , straw disintegrator , ensilage cutter ,fodder disintegrator , spade head / plowshares of the planting machine.