| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: produced slab is heated to temperature of austenisation. Further, slab is rough and finish hot rolled and cooled with water with acceleration to temperature of reeling 500600C. Winding into a reel and forced cooling are performed at rate 520C/h. Also, upon completion of rough rolling a breakdown bar is cooled to temperature 920980C. Finish rolling is performed with summary reduction not less, than 65% and temperature of finish rolling above Ar3. Strip accelerated cooling with water is performed in two stages, first at rate of 58C/sec to temperature 580620C, further at rate 0.51.5C/sec to temperature of reeling. Slabs are produced of steel containing the following chemical composition, wt %: 0.0150.090 C; 1.21.8 Mn; 0.10.5 Si; 0.010.10 Nb; 0.010.07 Al; Moëñ0.3; Crëñ0.3; Niëñ0.3; Cuëñ0.3; Vëñ0.12; Sëñ0.010; Pëñ0.015; 0.0030.012 N; Fe - the rest. ^ EFFECT: raised viscous and strength properties of strip due to creation of ferrite-bainitic micro-structure. ^ 2 cl, 3 tbl |
