A Rolling Method for Eliminating the Chilling Layer on the Surface of Medium Carbon Steel
A chilled layer, carbon steel technology, applied in metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problem of producing chilled layer, and achieve the effect of meeting hardness and organizational requirements
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Embodiment 1
[0048] In this embodiment, the medium carbon steel billet 16B38 is used as the raw material, and the medium carbon round steel with the specification of Φ26mm is rolled. The chemical composition (mass percentage) of the medium carbon steel billet 16B38 is: C: 0.37%, Si: 0.26%, Mn: 0.93%, P: 0.016%, S: 0.023%, N: 0.011%, Ti: 0.03%, B : 0.0008%, Cu: 0.07%, Al: 0.035%, and the balance is iron and inevitable impurities.
[0049] In this embodiment, a rolling method for eliminating the chill layer on the surface of medium carbon steel includes heating, rough rolling, intermediate rolling, first water penetration for cooling, second water penetration for cooling, finishing rolling, and third penetration Water cooling and cooling bed cooling.
[0050] In the heating process, the heating temperature is 1230°C; the heating time is 260min;
[0051] In the rough rolling process, the rolling temperature is 1170℃;
[0052] In the intermediate rolling process, the intermediate rolling pa...
Embodiment 2
[0060] The rolling method for eliminating the chill layer on the surface of medium carbon steel provided in this embodiment, except for the temperature before finishing rolling, the temperature of finishing rolling, the control parameters of the water tank for the second and third water penetration cooling, and the temperature of the upper cooling bed are the same as the embodiment 1, other processes and their parameters are the same as in Example 1. details as follows:
[0061] In the second water penetration cooling process, the rolling piece after intermediate rolling is cooled by water penetration, and the rolling piece enters the finishing rolling process after exiting the water tank, wherein the opening of the water tank is controlled at 75%, and the flow rate is 120L / min; The surface temperature is 765 ℃, that is, the surface temperature of the rolling stock before finishing rolling is 765 ℃.
[0062] Finishing rolling process: the rolling stock after the second water ...
Embodiment 3
[0067] The rolling method for eliminating the chill layer on the surface of the medium carbon steel provided in this embodiment is the same as that of the embodiment 1 except that the selected steel specifications are different from those of the embodiment 1. The details are as follows. In this embodiment, the medium carbon steel billet 16B38 is used as the raw material, and the medium carbon round steel with the specification of Φ40mm is rolled.
[0068] The ferrite+pearlite structure of the steel obtained in this example is very uniform and has no mixed crystal structure. The actual grain size of the steel is 8, and the hardness is 203HBW, which meets the quality requirements of controlled rolling and controlled cooling instead of offline normalizing, which saves the cost of offline normalizing and meets the user's surface quality and hardness requirements for cutting (190 ~ 230HBW) .
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Abstract
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