Method for controlling transverse crack defect on 75Cr1 steel surface
A control method and technology for transverse cracks, applied in the field of iron and steel, can solve the problem of high incidence of surface transverse cracks, and achieve the effects of improving the quality of the cast slab, uniform temperature distribution in the lateral direction of the slab, and increasing the amount of water on both sides.
Active Publication Date: 2021-04-06
湖南华菱涟钢特种新材料有限公司 +1
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Problems solved by technology
[0004] The main purpose of the present invention is to provide a method for controlling the defects of transverse cracks on the surface of 75Cr1 steel, aiming to solve the technical problem of the high incidence of transverse cracks on the surface of the existing 75Cr1 steel
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Embodiment 1
[0133] 1. Converter, LF refining process control
[0134] The molten iron is blown in a converter to meet the end point composition (see Table 9) and temperature control requirements, and then tapped for alloying. The molten steel enters the LF refining furnace for slag desulfurization, alloying, temperature adjustment, and calcium treatment, and then the continuous casting starts after meeting the soft blowing and calming time.
[0135] Table 9.75 Cr1 composition control requirements, %
[0136]
[0137] 2. Continuous casting process control
[0138] Before production, check the nozzles of the grille section and fan section off-line, and do not allow nozzles to be blocked, nozzles to drop, and spray water to be deflected; check the condition of the water baffle and water collection tank before production, and the water collection tank should be cleaned; the protection slag grade should be checked , do not use expired mold powder; match the section and cooling curve; stri...
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Abstract
The invention provides a method for controlling a transverse crack defect on a 75Cr1 steel surface. The method includes the following steps of: increasing a correction coefficient of an original secondary cooling curve corresponding to edge regions of a third spraying region to a sixth spraying region and a correction coefficient of the original secondary cooling curve corresponding to transition regions of the third spraying region to the sixth spraying region to obtain a corrected secondary cooling curve, wherein the edge region are regions corresponding to the two sides of the spraying regions, and the transition regions are regions corresponding to the positions between the edge regions and the center regions of the spraying regions; and continuously casting molten steel to obtain an ingot blank, and cooling the ingot blank in a secondary cooling region at a drawing speed of 3.7 m / min to 4.5 m / min according to the corrected secondary cooling curve. The control method provided by the invention increases the correction coefficient of the edge regions of the third spraying region to the sixth spraying region and the correction coefficient of the transition regions of the third spraying region to the sixth spraying region, increases the water amount of the two sides of the spraying regions, realizes uniform temperature distribution in the horizontal direction of the ingot blank, improves the quality of the ingot blank, and effectively controls the problem about occurrence of cracks on a 75Cr1 surface.
Description
technical field [0001] The invention relates to the field of iron and steel, in particular to a method for controlling transverse crack defects on the surface of 75Cr1 steel. Background technique [0002] The carbon content of medium and high carbon steel produced by LY Steel covers 0.2-1.0%, among which, the steel grade with carbon content >0.7% is mainly 75Cr1, and the production volume of other steel grades is small. 75Cr1 is a foreign standard cold tool steel grade, widely used in small tools, such as: circular saws, scissors, mandrels, punches, stamping tools, razors. 75Cr1 is mainly produced in the CSP production line, and its process route is: molten iron - converter - LF refining - thin slab continuous casting - soaking furnace - seven-stand rolling mill - coiling - storage. However, after the implementation of the speed-up process in the CSP production line, the speed and quality of other steel types with carbon content <0.7% and high-carbon steels except 75C...
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IPC IPC(8): B22D11/22C22C38/02C22C38/04C22C38/06C22C38/18
CPCB22D11/225C22C38/02C22C38/04C22C38/06C22C38/18
Inventor 戴智才徐刚军罗钢肖磊聂嫦平
Owner 湖南华菱涟钢特种新材料有限公司