No. 45 cold-rolled sheet and production method thereof
A technology of No. 45 steel and cold-rolled sheet, applied in the field of steel rolling, can solve the problems of low strip breakage rate and broken strip in No. 45 steel furnace, and achieve the effect of excellent performance and high stability
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Embodiment 1
[0041] The mass percentages of the chemical composition of a cold-rolled sheet No. 45 steel provided in this example are: C: 0.46%; Mn: 0.70%; Si: 0.30%; P: 0.025%; S: 0.015%; Alt: 0.02%; The balance is Fe and trace elements. When producing cold-rolled thin plate No. 45 steel with the above composition, the hot-rolling process controls the furnace temperature to 1200°C; the final rolling temperature is 890°C; the coiling temperature is 670°C; the cold-rolling process controls the cold The rolling reduction rate is 40%, and No. 45 strip steel is not cleaned and processed by the degreasing unit. In the bell annealing process, the chilled steel coil of No. 45 steel that has not been degreased enters the full hydrogen bell annealing furnace at room temperature. Process steps:
[0042] Step A1: freely heating the undegreased chilled coil to 400°C to obtain a steel strip at 400°C;
[0043] Step A2: heating the steel strip at 400°C to 710°C for 620 minutes;
[0044] Step A3: heat t...
Embodiment 2
[0052] The mass percentages of the chemical composition of a cold-rolled sheet No. 45 steel provided in this example are: C: 0.46%; Mn: 0.70%; Si: 0.30%; P: 0.015%; S: 0.005%; Alt: 0.2%; The balance is Fe and trace elements. When producing cold-rolled thin plate No. 45 steel with the above composition, the hot-rolling process controls the furnace temperature to 1250°C; the final rolling temperature is 900°C; the coiling temperature is 690°C; the cold-rolling process controls the cold The rolling reduction rate is 50%, and No. 45 strip steel is not cleaned and processed by the degreasing unit. In the bell annealing process, the chilled steel coil of No. 45 steel that has not been degreased enters the full hydrogen bell annealing furnace at room temperature. Process steps:
[0053] Step A1: freely heating the undegreased chilled coil to 400°C to obtain a steel strip at 400°C;
[0054] Step A2: heating the steel strip at 400°C to 730°C for 660 minutes;
[0055] Step A3: heat th...
Embodiment 3
[0063] The mass percentages of the chemical composition of a cold-rolled sheet No. 45 steel provided in this example are: C: 0.44%; Mn: 0.68%; Si: 0.25%; P: 0.005%; S: 0.001%; Alt: 1.0%; The balance is Fe and trace elements. When producing cold-rolled thin plate No. 45 steel with the above composition, the hot-rolling process controls the furnace temperature to 1280°C; the final rolling temperature is 910°C; the coiling temperature is 700°C; the cold-rolling process controls the cold The rolling reduction rate is 60%, and No. 45 steel strip is not cleaned and processed by the degreasing unit. In the bell annealing process, the chilled steel coil of No. 45 steel that has not been degreased enters the full hydrogen bell annealing furnace at room temperature. Process steps:
[0064] Step A1: freely heating the undegreased chilled coil to 400°C to obtain a steel strip at 400°C;
[0065] Step A2: heating the steel strip at 400°C to 720°C for 640 minutes;
[0066] Step A3: heat ...
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Abstract
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