圧延 H 形鋼の残留応力の抑制と制御

概要

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(1) Residual stresses in Hot-rolled H-shape are caused by the inhomogenity of thermal distribution. Especially, temperature difference between web and flanges during cooling are important factores. Therefore, following methods are found to be effective to control and reduce the magnitude of residual stresses. (a) Forced cooling on the outside surfaces of flanges during cooling. (b) Cooling on cooling bed keeping the web vertical or flange horizontal. (c) Heating of the web after cooling. (2) Destructive and non-destructive methods are applied to measure the residual stress distribution. The measured residual stresses on the flanges have different distribution depending on the measuring methods but have similar distributions on webs. This is mainly due to the different measurable depth of each methods. X-ray and magnetic methods, for example, measure the mean stresses only in the thin layer of the surface. In order to get the stable measurement to monitor and control residual stresses non-destructively it is desirable to measure on the web.
社団法人日本鉄鋼協会の論文
1979-08-01