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A method for producing high-carbon manganese-chromium steel from large-section continuous casting round billets

A high-carbon manganese-chromium steel and continuous casting round billet technology is applied in the production field of large-section high-carbon manganese-chromium steel continuous casting round billets, and can solve the problems of C segregation in the center of the billet, segregation of MnS in inclusions, looseness, shrinkage, internal Crack metallurgical defects cannot be eliminated and other problems, to achieve the effect of eliminating low-magnification white bright band, improving low-magnification quality, and reducing central C segregation

Active Publication Date: 2021-07-20
JIANGSU LIANFENG ENERGY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The embodiments of the present invention provide a production method for continuous casting round billet of high-carbon manganese-chromium steel with large cross-section, which solves the problems caused by the high content of easily segregated elements such as C, Mn, and Cr in high-carbon manganese-chromium steel in the prior art. Technical problems that cannot be eliminated due to metallurgical defects such as C segregation in the billet center, inclusion MnS segregation, porosity, shrinkage cavity, and internal cracks inherent in continuous casting crystallization

Method used

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  • A method for producing high-carbon manganese-chromium steel from large-section continuous casting round billets
  • A method for producing high-carbon manganese-chromium steel from large-section continuous casting round billets
  • A method for producing high-carbon manganese-chromium steel from large-section continuous casting round billets

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Experimental program
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Effect test

Embodiment 1

[0028] figure 1 It is a schematic flow chart of a production method of a large-section high-carbon manganese-chromium steel continuous casting round billet in an embodiment of the present invention, as figure 1 As shown, the method includes:

[0029] Step 110: Calculate the liquid core length of the molten steel in the continuous casting round billet;

[0030] Further, the calculation of the liquid core length of the molten steel in the continuous casting round billet includes: obtaining the composition of the steel type and the cross-sectional size of the continuous casting round billet; obtaining the preset cooling intensity, the preset degree of superheat of the molten steel and the preset casting speed; according to The composition of the steel type, the section size of the continuous casting round billet, the preset cooling intensity, the preset degree of superheat of molten steel and the preset casting speed are used to calculate the liquid core length of the molten ste...

Embodiment 2

[0049] A steel (GCr15SiMn) composition: [C]: 1.01%, [Si]: 0.60%, [Mn]: 1.15%, [Cr]: 1.52%, [Ni]: 0.04%, [Mo]: 0.02%, the rest Cu, Ca, Al, Ti, Fe and impurities P, S, As, Pb, Sn, etc.

[0050] Table 1 Length of internal liquid core of GCr15SiMn steel slab (superheat degree: 25℃)

[0051]

[0052] According to the progress of the project, the bearing steel GCr15SiMn smelting Ф500mm, Ф600mm, and Ф800mm will be poured once respectively.

[0053] Measure the temperature before the ladle is placed on the continuous casting rotary stand; the ladle is covered with a long nozzle and protected by argon gas, and the pouring is started; when the molten steel level of the tundish rises to 350mm, the pouring of each stream of the tundish is started step by step, and the pouring is started according to the regulations Start and start speed up; when the ladle is pouring 1 / 5, the tundish starts to measure the temperature, and the temperature measurement interval of the continuous pouring f...

Embodiment 3

[0064] B steel (special steel HF-1) composition: [C]: 1.04%, [Si]: 0.80%, [Mn]: 1.75%, [Cr]: 0.52%, [Ni]: 0.45%, [Mo]: 0.22%, the rest is Cu, Ca, Al, Ti, Fe and impurity P, S, H, O, N gas, etc.

[0065] Table 4 Length of internal liquid core of special steel HF-1 slab (superheat degree: 25°C)

[0066]

[0067] According to the progress of the project, the special steel HF-1 smelting will be carried out one time for Ф600mm and one time for Ф900mm respectively, and the casting speed of each time is tentatively set at 0.30m / min and 0.10m / min.

[0068] Measure the temperature before the ladle is placed on the continuous casting rotary stand; the ladle is covered with a long nozzle and protected by argon gas, and the pouring is started; when the molten steel level of the tundish rises to 350mm, the pouring of each stream of the tundish is started step by step, and the pouring is started according to the regulations Start and start speed up; when the ladle is poured 1 / 5, the tun...

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Abstract

The invention discloses a production method of large-section high-carbon manganese-chromium steel continuous casting round billet. The method comprises: calculating the liquid core length of molten steel in the continuous casting round billet; Stirring position information; according to the liquid core length of the molten steel in the continuous casting round billet and the position information of the casting stream electric stirrer and the end electric stirrer, set the electromagnetic stirring process parameters; calculate the actual molten steel superheat; according to the continuous casting round billet Section size and the actual molten steel superheat, control the casting speed of the continuous casting round billet, so that the liquid metal ratio inside the continuous casting round billet reaches a predetermined value; start electromagnetic stirring according to the electromagnetic stirring process parameters; Send the heat to the heating furnace or enter the slow cooling pit for slow cooling. It achieves the technical effect of reducing the C segregation in the center of the continuous casting slab, eliminating the low-power white and bright band of the casting slab, improving internal looseness, shrinkage cavity, internal cracking and other defects, and improving the low-power quality of the casting slab.

Description

technical field [0001] The invention relates to the technical field of rolling high-carbon manganese-chromium steel continuous casting round billets, in particular to a production method of large-section high-carbon manganese-chromium steel continuous casting round billets. Background technique [0002] High-carbon manganese-chromium steel mainly refers to steel types with a carbon content of more than 0.8% and high manganese-chromium content, including bearing steel, tool steel, spring steel, cord steel, bridge cable steel, special (military) steel, etc. . However, due to the high content of segregation-prone elements C, Mn, and Cr in high-carbon manganese-chromium steels, metallurgical defects such as C segregation in the billet center, inclusion MnS segregation, porosity, and internal cracking cannot be eliminated during continuous casting crystallization. At the same time, the large-section round billet continuous casting equipment does not have a soft end, which is not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115B22D11/16
CPCB22D11/115B22D11/16
Inventor 薛伟江杨兆全陈树军王剑锋高华耀张旭辉刘绍康雷三祥陈金仝陈庆丰
Owner JIANGSU LIANFENG ENERGY EQUIP
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