Abstract: The oxidation scale of low carbon steel， low alloy steel and alloy steel containing Cr at different temperatures， the thickness of scale and phase analysis of scale are studied， the results show that the alloy steel wire containing Cr is easy to produce Fe₃O₄ when oxidized at 850 ℃， and Fe₂O₃ is the main oxidation scale during slow cooling. It is easy to produce the oxidation scale structure with Fe₃O₄ as the main component when the alloy steel wire containing Cr is spun at about 850 ℃ during normal rolling and slowly cooling， which is disadvantageous to the subsequent pickling and descaling. The FeO content can be increased to improve the descaling performance of iron oxide scale by increasing the spinning temperature above 900 ℃ and opening the insulation cover after spinning.

Key words: Oxide Scale, Cr, EBSD, Alloy Steel

摘要： 研究了低碳钢、低合金钢、以及含Cr的合金钢不同温度时的氧化情况，测量铁皮厚度并对铁皮进行物相分析，发现含Cr的合金钢线材在850 ℃氧化时，容易生成Fe₃O₄，且缓冷时铁皮又以Fe₂O₃为主。正常轧制时，含Cr的合金钢线材在850 ℃吐丝以及缓慢冷却时容易生成以Fe₃O₄为主要成分的铁皮，对后续的酸洗除鳞不利。提高吐丝温度到900 ℃以上，并且吐丝后开启保温罩，可以提高FeO的含量，从而改善氧化铁皮的除鳞性能。

关键词: 氧化铁皮, Cr, EBSD, 合金钢