引言人们在使用金属材料时,不但要考虑它们的成本是否经济,更要考虑它们的性能是否合乎要求。对金属性能的要求可以分为整体性能与表面性能两个方面。属于前者的有力学性质、物理性质、加工性能、焊接性能等等;属于后者的有耐腐蚀性能、耐高温氧化性能、耐磨耗性能等等。使用金属的条件 Introduction People use metal materials, not only to consider whether their cost is economical, but also to consider whether their performance is satisfactory. Metal performance requirements can be divided into two aspects of the overall performance and surface properties. The former belongs to the mechanical properties, physical properties, processing properties, welding properties, etc .; belonging to the latter have corrosion resistance, high temperature oxidation resistance, wear resistance and so on. Metallic conditions