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The first skill measure to improve the quality of bearing steel continuous casting billet

Source: Bearing network time: 2014-04-17
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The primary skill measures to improve the quality of bearing steel slabs are:
.1) Select low-superheat clean steel pouring form 1) Strengthen the essence of molten steel; make molten steel composition and temperature meet the pouring requirements; control the harmful elements and gas content at the lowest level. According to the experience of pouring high-quality steel at home and abroad; Blowing argon to adjust temperature; not only can uniform chemical composition; promote non-metallic inclusions in molten steel. On the 苡 苡 У鼐 炙 炙 炙 龋 ) ) ) ) 2) ladle to tundish, tundish to crystallizer Pouring; and shutting down with argon,
3) Fully play the metallurgical function of the tundish; use the trapezoidal tundish with larger capacity; and use the double slag to make the inclusions in the molten steel abundant. The smashing è°– ç¡® ç¡® ç¡® ç¡® ç¡® ç¡® ç¡® ç¡® 4 4 4 4 4 4 4 4 Use a suitable function of the slag; and increase evenly,
5) Steel ladle and intermediate tank are covered with heat preservation; to reduce heat loss; complete low temperature pouring,
6) The intermediate tank heating skill can also be selected when conditions are met; the superheat of the poured molten steel is controlled within ±5 °C.
.2) Optimize the slab cooling system 1) Strengthen the crystallizer cooling system. Improve the cooling water flow rate of the crystallizer; prevent part of the jubilant appearance. Select the appropriate crystallizer taper; reduce the air gap that blocks heat conduction; enhance heat transfer.
2) Optimize the secondary cooling system of the casting blank. Select the multi-stage atomization cooling method in the second cooling zone; pay attention to the nozzle alignment; improve the uniformity of cooling. According to the external temperature of the casting blank in the second cooling zone, the previous history of water receiving, and the blanking The speed and the superheat of the intermediate tank molten steel dynamically control the cooling intensity of each flow to achieve the best cooling effect; reduce the external crack, internal crack and warping appearance of the slab; improve its appearance quality and mechanical function.
3) Decreasing the mechanical stress and strain rate of the slab. Strictly control the arc alignment of the arc segment equipment; reduce the mechanical stress. Use multiple points or successive straightening; reduce the deformation rate of the slab appearance and the two-phase zone.
4) Crystallizer liquid level control. Select crystallizer liquid level control system; cooperate with small amplitude and high frequency oscillation (amplitude?~±4, frequency ~300°C/min); make crystallizer liquid surface shake small (static<± 2mm, dynamic <±5mm); to reduce the vibration marks; prevent slag.
5) Electromagnetic stirring and light pressing. Electromagnetic mixing is used for crystallizer; it can improve the appearance and internal quality of high carbon steel slab; increase equiaxed crystal ratio; reduce intermediate segregation and intermediate looseness and shrinkage of casting blank; Use a straightening machine to gently press the slab to reduce the intermediate segregation.
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