HEAT TREATMENT METHOD FOR CLAD STEEL SHEET

摘要

PURPOSE:To prevent the occurence of surface roughening due to heavy working by heat treating a clad steel sheet for heavy working at a specific temp. for a specific time. CONSTITUTION:A clad steel sheet of 6 mm or below in thickness consisting of stainless steel or a Ni-Cr alloy and mild steel is heat treated under the conditions within the region of the oblique line portion of the drawing. The drawing shows the relation between heating temp. and time of the steel, and the region is specified by the temp. range of 800-980 deg.C and the heating time range of 15-300 sec/mm of steel. Out of the heat treatment conditions, the double oblique line portion of 900- 950 deg.C and 30-150 sec/mm is the optimal region. After the heat treatment the sheet is air-cooled or water-cooled to prevent the occurence of surface roughening due to heavy working.