钢的氧化行为与氧化铁皮结构演变

The oxidation behavior of steel and the evolution of scale

通过对氧化铁皮结构在冷却时的转变以及易除鳞氧化铁皮结构组成的研究成果,对热轧产品氧化铁皮的研究结论进行了总结,主要结论为:纯铁在570℃以上温度的空气中氧化,可以得到典型的FeO、Fe_(3)O_(4)、Fe_(2)O_(3)三层结构;在700℃以上温度的空气中氧化,三层结构的厚度比例恒定为95:4:1;根据化学成分、气氛条件、气体流动速率、基体组织、试样表面粗糙度、晶粒尺寸、氧化时间、氧化温度的不同,钢铁材料的氧化铁皮呈现出不同的结构和比例。热轧过程中,根据原始氧化铁皮结构和冷却条件的不同,最终产品的氧化铁皮结构同样出现复杂的变化,不同的结构显著影响了后续除鳞。

The research results on the transformation of steel oxidation structure during cooling and the com-position of easily descaled iron scale structure in hot-rolled products have been summarized.The main conclusions are:pure iron can be oxidized in air above 570℃to obtain typical three-layer structures of FeO,Fe_(3)O_(4),and Fe_(2)O_(3);oxidation occurs in air at temperatures above 700℃,and the thickness ratio of the three-layer structure remains constant at 95:4:1;according to different chemical composition,atmosphere conditions,gas flow rate,matrix struc-ture,sample surface roughness,grain size,oxidation time,and oxidation temperature,the oxide scale of steel materi-als exhibits different structures and proportions;during the hot rolling process,the structure of the final product's oxide scale also undergoes complex changes depending on the original oxide scale structure and cooling conditions,and different structures significantly affect subsequent descaling.