... 5.alloy steel spur gear Nantong Runfeng Powder Metallurgy Co., Ltd. is specializing in powder metallurgy,oil bearings,structural ... --resizing--cleaning--vacuum oiling--packing3.material:steel,copper,steel copper,bronze,alloy.4.produce equipment:200T,100T,60T, ... ,pulley,timing pulley,structural parts,powder metallurgy parts,nut,auto parts,rotor and stator,sintered parts,alloy steel spur gear etc ...