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 Fe

3

O

4

when oxidized at 850 ℃， and Fe

2

O

3

is the main oxidation scale during slow cooling. It is easy to produce the oxidation scale structure with Fe

3

O

4

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.