Abstract
The bars before drawing are produced by hot rolling and heat treatment process. But, by these process the scales are generated on surface of bars. Before drawing the process that the scales are removing is necessary. The pickling or the shot blasting is usually used in this descaling process. In the residual stress after bar .drawing by pickling and shot blasting was measured by X-ray and slitting method. As results, if the bars are demanded high fatigue quality on surface, the pickling is more effective than the shot blasting.
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