Yongnian roller parts manufacturers | day standard fasteners, roller accessories [standards], 西宁托 roller accessories provided by day-standard fasteners. We are the days of standard fasteners, Ltd. Handan City (www.hdtbjgj.com) located at: Handan specializes in: roller, roller, roller frame, roller parts, conveyors, mining railway accessories Handan City days marked tight Firmware Ltd. specializes in producing vertical roller, roller frame, lifting lugs, connecting piece, nylon ground roller. Mass production of vertical roller, roller frame, lifting lugs, connecting piece, nylon ground roller, price, standard fasteners, Ltd. Handan City days to provide you with the vertical roller, roller frame, lifting lugs, connecting piece, nylon ground roller The latest price quotes roller bracket used for businessmen to provide the most valuable vertical roller, roller frame, lifting lugs, connecting piece, nylon ground roller information. Wear resistance, long service life. Idler roller body specialized polymer materials, mechanical properties similar to bronze, with good abrasion resistance, and has a good self-lubricating properties, not to hurt the belt. Handan City, specializing in the production of standard fasteners day vertical roller, roller frame, lifting lugs, connecting piece, nylon ground roller. Mass production of vertical roller, roller frame, lifting lugs, connecting piece, nylon ground roller, price, standard fasteners, Ltd. Handan City days to provide you with the vertical roller, roller frame, lifting lugs, connecting piece, nylon ground roller The latest price quotes for merchants to provide the most valuable vertical roller, roller frame, lifting lugs, connecting piece, nylon ground roller information. Beneficial elements manganese steel, silicon, vanadium, titanium, etc., can be controlled incorporation into low-alloy steel smelting. The main steel harmful elements sulfur, phosphorus and oxygen, pay special attention to control its content. Phosphorus is one of the elements in steel is harmful mainly dissolved from the strengthening effect of ferrite. Phosphorus content increased, the strength of steel, hardness roller fitting standards significantly decreased ductility and toughness. Especially in the lower temperature, ductility and toughness on the larger roller parts, thereby significantly increasing the cold brittleness of the steel. Phosphorus also can significantly reduce the steel weldability, but phosphorus can improve wear resistance and corrosion resistance of steel. Sulfur is also harmful element, showing the presence of nonmetal sulfide inclusions in the steel, the reduction of various mechanical properties of the steel. Because of the low melting point of sulfur, separating the steel grains caused during thermal processing, causing fracture of steel, the formation of thermal embrittlement, called hot brittleness. Sulfur steel weldability, toughness, fatigue resistance and corrosion resistance etc. is reduced. Oxygen is harmful elements in steel, mainly in the non-metallic inclusions, a small amount of melted in ferrite. Reduced mechanical properties of the non-metallic inclusions in steel, particularly toughness. Oxygen has a tendency to promote the role of aging. Low melting point oxides are caused weldability of the steel is deteriorated.