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Method for producing large-section high-carbon-manganese-chromium steel continuous casting round billet

A high-carbon manganese-chromium steel and continuous casting round billet technology, which is applied in the production field of large-section high-carbon manganese-chromium steel continuous casting round billet, can solve billet center C segregation, inclusion MnS segregation, porosity, shrinkage cavity, internal Cracking metallurgical defects can not be eliminated and other problems, to achieve the effect of eliminating low-magnification white and bright bands, reducing central C segregation, and improving technical effects

Active Publication Date: 2019-12-17
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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  • Method for producing large-section high-carbon-manganese-chromium steel continuous casting round billet
  • Method for producing large-section high-carbon-manganese-chromium steel continuous casting round billet
  • Method for producing large-section high-carbon-manganese-chromium steel continuous casting round billet

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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 method for producing a large-section high-carbon-manganese-chromium steel continuous casting round billet. The method comprises the following steps of calculating the liquidcore length of molten steel in a continuous casting round billet; obtaining position information of a casting flow electromagnetic stirrer and a tail end electromagnetic stirrer of a continuous casting machine; setting electromagnetic stirring process parameters according to the liquid core length of the molten steel in the continuous casting round billet and the position information of the casting flow electromagnetic stirrer and the tail end electromagnetic stirrer; calculating an actual superheat degree of the molten steel; according to the section size of the continuous casting round billet and the actual superheat degree of the molten steel, controlling a drawing speed of the continuous casting round billet to enable the proportion of liquid metal in the continuous casting round billet to reach a preset value; starting electromagnetic stirring according to the electromagnetic stirring process parameters; and sending the continuous casting round billet to a heating furnace or a slow cooling pit for slow cooling. The method achieves the technical effect of reducing the C segregation of the center of the continuous casting round billet, eliminating the macrostructure white band of the casting blank, improving the defects of the internal loosening, shrinkage porosity, internal cracking and the like, and improving the macrostructure quality of the casting blank.

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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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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