汽车零件、机械零件或轴承都要求耐冲击性的材料,可以使用表面渗碳钢。由于渗碳处理,材料在高温长时间的加热,使晶粒粗大,耐冲击性恶化。而高温渗碳用钢是通过添加特殊元素(Nb),即使比原来渗碳温度高,晶粒也不粗大的材料。快速渗碳用钢是通过改善化学成份,在现行渗碳温度下,可大大缩短渗碳时间的材料。 Car parts, mechanical parts or bearings require impact resistance of materials, you can use the surface carburized steel. Due to the carburizing treatment, the material is heated at a high temperature for a long time, so that the crystal grains are coarse and the impact resistance is deteriorated. The high-temperature carburizing steel is by adding special elements (Nb), even if the carburizing temperature is higher than the original, the grain is not coarse material. Fast carburizing steel is a material that can greatly reduce carburizing time at the current carburizing temperature by improving the chemical composition.