The invention provides a large-specification high-carbon
chromium bearing steel hot-rolled
wire rod and a high-speed
wire rod production method thereof. The method comprises the following steps that (1) a
continuous casting square billet is heated in a
heating furnace, the temperature of a preheating section ranges from 830 DEG C to 880 DEG C, the temperature of a heating section ranges from 1150DEG C to 1210 DEG C, and the temperature of a soaking section ranges from 1190 DEG C to 1220 DEG C; (2) the
continuous casting square billet is subjected to heat preservation in a high-temperature section, and the heat preservation time is larger than or equal to 120 min; (3) the
continuous casting square billet is rolled through a high-speed
rolling mill, the initial rolling temperature is controlled to be 1090-1120 DEG C, the
spinning temperature is controlled to be 860-900 DEG C, the swing amplitude of a
spinning machine is controlled, and the continuous
casting square billet is rolled intoa hot-rolled
wire rod; (4) the rolled hot-rolled wire rod is cooled to be larger than or equal to 550 DEG C at the
cooling speed of 0.7-0.9 DEG C / s, the speed of a Stelmor line roller way is controlled, coil collection is carried out, and then
air cooling is carried out to reach the
room temperature; (5) surface quality inspection, finishing and sampling are carried out on the collected hot-rolled wire rod; and (6) the finished hot-rolled wire rod is quickly packaged online. According to the high-speed wire rod production method, the bearing steel hot-rolled wire rod with phi 21-25 mm is produced.