本发明公开了一种低合金结构钢的耐蚀性评价方法,包括：将按低合金结构钢元素组成计算的耐大气腐蚀性指数I、通过金相组织计算的珠光体相含量(X1)及晶粒度等级(X2)、通过夹杂物观察计算的典型视场下夹杂物面积百分比(X3)等四个变量带入式：Y＝I-0.062X1+0.10X2–12.1X3中,得到该待评价低合金结构钢的综合耐蚀指数Y,通过Y的大小判断该低合金结构钢耐蚀性的高低。该方法考虑因素较为全面,步骤简单,操作方便,无需进行大量模拟及户外实验,实验周期短,便于为低合金结构钢在实际使用中提供更加准确、更为合理的耐蚀性评价标准。

The present invention discloses a method for evaluating the corrosion resistance of a low-alloy structural steel, comprising: an atmospheric corrosion resistance index I calculated from the elemental composition of the low-alloy structural steel, a pearlite phase content (X1) and a grain size grade (X2) calculated from the metallographic organization, a percentage of inclusions in a typical field of view (X3) calculated from inclusions observation, and other four variables brought into the formula: Y = I - 0.062X1+ 0.10X2-12.1X3 to obtain a comprehensive corrosion resistance index Y for the low-alloyed structural steel to be evaluated, which is used to determine the level of corrosion resistance of the low-alloyed structural steel. The method is comprehensive, simple, easy to operate, does not require extensive simulations and outdoor experiments, and has a short experimental cycle, which is convenient for providing more accurate and reasonable corrosion resistance evaluation criteria for low-alloy structural steels in actual use.