Control Method of Transverse Crack Defect on 75cr1 Steel Surface
A control method and technology for transverse cracks, which is applied in the field of iron and steel, can solve the problems of high incidence of surface transverse cracks, achieve the effects of improving the quality of billets, controlling problems, and increasing the amount of water on both sides
Active Publication Date: 2022-01-28
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 application provides a method for controlling transverse crack defects on the surface of 75Cr1 steel, comprising the following steps: increasing the correction coefficient of the edge area of the original secondary cooling curve corresponding to the 3rd to 6th spray areas and the original secondary cooling curve corresponding to the first The correction coefficient of the transition area of the 3-6 spray area is used to obtain the corrected quadratic cold curve. The edge area is the area corresponding to both sides of the spray area, and the transition area is the area corresponding to the edge area and the corresponding The area between the central areas of the spraying area; the molten steel is continuously cast to obtain a slab, and the slab enters the secondary cooling zone at a casting speed of 3.7-4.5 m / min to be cooled according to the modified secondary cooling curve. According to the control method of the present application, the correction coefficients of the edge regions of the 3rd to 6th spray zones and the correction coefficients of the transition zones are increased, the water volume on both sides of the spray zone is increased, the lateral temperature distribution of the slab is even, and the slab The quality has been improved, and the problems of 75Cr1 surface cracks have been effectively controlled.
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...
Claims
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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