冷拔矩形截面型钢的表面残余应力分布随着减面率不同而变化。纵向残余应力呈凹形分布,并随减面率逐渐增加到20％左右而渐趋平缓,平均值也下降,横向表面残余应力呈中凸分布,随减面率增加凸起的程度有所加强。本文就这些变化给出一些变形理论上的解释,并对以上试件进行去应力热处理,测定其效果。 The surface residual stress distribution of cold drawn rectangular section steel changes with the reduction of surface area. The longitudinal residual stress is concave, and gradually decreases with the decreasing rate to about 20%. The mean value also decreases, and the residual stress in the transverse direction is convex. The degree of protrusion increases with decreasing rate . In this paper, some theoretical explanations of deformation are given for these changes, and the above specimens are subjected to stress-relief heat treatment to determine the effect.