Along with strict environmental regulation, new-energy vehicles are becoming increasingly popular due to their low emissions, and they will inevitably replace existing fossil-fuel-based buses in China. To achieve a li...Along with strict environmental regulation, new-energy vehicles are becoming increasingly popular due to their low emissions, and they will inevitably replace existing fossil-fuel-based buses in China. To achieve a lightweight bus body ,high-strength steels are commonly used for the bus frame,but these grades are susceptible to corrosion. From the perspective of ＂lower life-cycle cost＂, high-strength stainless steel is a better bus structure choice than high-strength carbon steels, since stainless steel bus frames last 10-15 years without requiring any maintenance. The low-cost high-strength stainless steels developed by Baosteel are introduced,the yield and tensile strengths of which can be controlled to within the range of 350-700 MPa and 900-1 200 MPa,respectively, and the elongation values are above 30%. Measurements of the toughness and fatigue resistance of these high-strength stainless steels and their joints indicate that the structural integrity requirements for bus frames can be met. The results of salt spray corrosion studies indicate that stainless steels will substantially increase the service life of bus frames in wet and icy winter conditions where deicing with CaC12 is necessary for road safety. The results of our investigation clearly indicate that high-strength stainless steel is a potential bus-frame material that makes it possible to achieve substantial weight savings, excellent corrosion resistance, and prolonged operational life.展开更多
基金sponsored by Shanghai Committee of Science and Technology with the project No.15XD1520100
文摘Along with strict environmental regulation, new-energy vehicles are becoming increasingly popular due to their low emissions, and they will inevitably replace existing fossil-fuel-based buses in China. To achieve a lightweight bus body ,high-strength steels are commonly used for the bus frame,but these grades are susceptible to corrosion. From the perspective of ＂lower life-cycle cost＂, high-strength stainless steel is a better bus structure choice than high-strength carbon steels, since stainless steel bus frames last 10-15 years without requiring any maintenance. The low-cost high-strength stainless steels developed by Baosteel are introduced,the yield and tensile strengths of which can be controlled to within the range of 350-700 MPa and 900-1 200 MPa,respectively, and the elongation values are above 30%. Measurements of the toughness and fatigue resistance of these high-strength stainless steels and their joints indicate that the structural integrity requirements for bus frames can be met. The results of salt spray corrosion studies indicate that stainless steels will substantially increase the service life of bus frames in wet and icy winter conditions where deicing with CaC12 is necessary for road safety. The results of our investigation clearly indicate that high-strength stainless steel is a potential bus-frame material that makes it possible to achieve substantial weight savings, excellent corrosion resistance, and prolonged operational life.
