Acid-pickling-free hot rolled strip steel with high surface quality and manufacturing method thereof
A technology for hot-rolled strip steel and a manufacturing method, which is applied to the field of pickling-free hot-rolled strip steel and its manufacturing, can solve the problems that stamping and falling off cannot be completely avoided, the surface quality of pickling sheets and cold-rolled sheets cannot be achieved, and the like. The effect of peeling off the oxide layer, improving adhesion and formability, and excellent formability
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Embodiment A1-A12、 comparative example B1-B5
[0064] Table 1 lists the structural data of the high surface quality pickling-free hot-rolled steel strips of Examples A1-A12 and the steel strips of Comparative Examples B1-B5.
[0065] Table 1.
[0066]
[0067] As can be seen from Table 1, the thickness of its pure iron layer of the high surface quality non-pickling hot-rolled steel strip of embodiment A1-A12 is 0.5-5 μ m, and the thickness of pure iron layer is less than 1 / 2nd of surface oxide layer thickness , the coverage of the pure iron layer on the iron oxide layer is greater than 70%, the thickness of the surface oxide layer is less than 20 μm, and the thickness of the inner oxide layer is less than 30 μm.
[0068] figure 2 The surface morphology of Example A1 is shown. image 3 The surface morphology of Comparative Example B1 is shown. Figure 4 The cross-sectional metallographic structure of Example A1 is shown. Figure 5 The cross-sectional metallographic structure of Comparative Example B1 is shown. Fig...
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