| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: workpiece with thickness of 240-315 mm is heated during at least 3 hours to austenisation temperature of 1180-1200C and subject to reversible rolling per odd number of passes. Rolling is performed in each pass, except two last passes with single relative swaging ëÑ10%, and in two last passes - ëÑ8%; rolling is completed at temperature of 760-780C; after that, accelerated cooling is performed at speed of 20-30C/sec to temperature of 500-600C, and then optional cooling in the air is performed. Solid cast sections are obtained from steel at the following component ratio in it, wt %: C=0.03-0.05, Mn=1.4-1.6, Si=0.2-0.3, Nb=0.07-0.08, Vëñ0.004, Ti=0.02-0.04, Cr=0.2-0.25, Ni=0.02-0.05, Cu=0.02-0.05, Al=0.02-0.05, iron and impurities with content of each impurity element of less than 0.03% is the rest. ^ EFFECT: higher quality of plate. ^ 2 cl, 2 tbl, 1 dwg, 1 ex |
