MANUFACTURING METHOD OF PLATES FROM LOW-ALLOY PIPE STEEL WITH STRENGTH CLASS K60

摘要

FIELD: metallurgy. ^ SUBSTANCE: slab workpiece is obtained from steel with the specified chemical composition; workpiece is heated to temperature of 1000-1100C, and roughing-down is performed at that temperature and at single relative swagings of not less than 12%; rolled metal is cooled to temperature of the beginning of finish rolling, which is equal to 81020C; finish rolling is performed at temperature of end of rolling of 80515C; and plate with thickness of 26-27 mm is obtained; after that, quick cooling of plate surface is performed from temperature of not less than 760C to temperature of 560C at cooling rate of 12-18C/sec. ^ EFFECT: providing improved mechanical properties in hot-rolled plate, which are equal across the section and correspond to strength class K60. ^ 1 ex, 1 tbl