Method for reducing segregation during pouring of continuous casting billets for gears

A continuous casting and gear technology, applied in the field of alloy steel, can solve the problems of severe segregation, achieve the effects of avoiding segregation aggregation, reducing electricity consumption, and increasing cooling water

Active Publication Date: 2021-11-02
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too strong electromagnetic stirring will promote the solute exchange at the solidification front, resulting in serious segregation

Method used

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  • Method for reducing segregation during pouring of continuous casting billets for gears
  • Method for reducing segregation during pouring of continuous casting billets for gears
  • Method for reducing segregation during pouring of continuous casting billets for gears

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) When SAE8620H is smelted in the LF refining process, after the alloy element composition of the molten steel is adjusted to the target value in the mid-stage of refining, the electrode is energized to raise the temperature of the molten steel to the liquidus temperature +70°C for vacuum treatment;

[0029] 2) Continuous casting 150×150mm billet crystallizer uses 150m 3 / h water volume, turn off the electromagnetic stirrer of the crystallizer, the stirring parameters of the end electromagnetic stirrer are: 60A / 10Hz (alternate mode), the casting speed is 2.00m / min, the specific water volume of the secondary cooling is 0.60L / kg, and the water volume ratio of the foot roll section 40%;

[0030] 3) Use a Φ6mm alloy drill bit to sample the cuttings at 6 points from the surface, 10mm, 1 / 16L, 1 / 8R, 1 / 4L, 3 / 8L, 1 / 2L, on the diagonal line of the billet transverse low-magnification sample, And use the infrared carbon sulfur analyzer carbon content, after analysis, from the sur...

Embodiment 2

[0036] 1) When 20CrMnTiH3 / RT smelting is carried out in the LF refining process, after the alloy element composition of the molten steel is adjusted to the target value in the mid-stage of refining, the electrode is energized to raise the temperature of the molten steel to the liquidus temperature +70°C for vacuum treatment;

[0037] 2) Continuous casting 150×150mm billet crystallizer uses 150m3 / h water volume, turn off the electromagnetic stirrer of the crystallizer, the stirring parameters of the end electromagnetic stirrer are: 60A / 10Hz (alternate mode), the casting speed is 2.00m / min, the specific water volume of the secondary cooling is 0.60L / kg, and the water volume ratio of the foot roll section 40%;

[0038] 3) Use a Φ6mm alloy drill bit to sample the cuttings at 6 points from the surface, 10mm, 1 / 16L, 1 / 8R, 1 / 4L, 3 / 8L, 1 / 2L, on the diagonal line of the billet transverse low-magnification sample, And use the infrared carbon sulfur analyzer carbon content, after analys...

Embodiment 3

[0044] 1) When 22CrMoH is smelted in the LF refining process, after the alloy element composition of the molten steel is adjusted to the target value in the mid-stage of refining, the electrode is energized to raise the temperature of the molten steel to the liquidus temperature +70°C for vacuum treatment;

[0045] 2) Continuous casting 150×150mm billet crystallizer uses 150m 3 / h water volume, turn off the electromagnetic stirrer of the crystallizer, the stirring parameters of the end electromagnetic stirrer are: 60A / 10Hz (alternate mode), the casting speed is 2.00m / min, the specific water volume of the secondary cooling is 0.60L / kg, and the water volume ratio of the foot roll section 40%;

[0046] 3) Use a Φ6mm alloy drill bit to sample the cuttings at 6 points from the surface, 10mm, 1 / 16L, 1 / 8R, 1 / 4L, 3 / 8L, 1 / 2L, on the diagonal line of the billet transverse low-magnification sample, And use the infrared carbon sulfur analyzer carbon content, after analysis, from the surf...

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Abstract

The invention discloses a method for reducing segregation in the pouring process of continuous casting billets for gears, which comprises the following steps: before the end of LF refining, the temperature of molten steel is raised until the superheat of continuous casting molten steel is 20-30°C, and continuous casting of 150×150mm billets The first cooling and the second cooling use a large amount of water, and the proportion of water in the foot roll section reaches 40%. Turn off the electromagnetic stirring of the crystallizer, use a lower current for the electromagnetic stirring at the end, and use a casting speed of 2.00m / min. The present invention avoids excessive stirring in the mold during pouring of molten steel by not using electromagnetic stirring of the crystallizer, resulting in slag entanglement affecting the purity of molten steel, increasing the amount of cooling water, improving the cooling intensity, reducing the casting speed, and fully cooling the slab to achieve the promotion of columnar The effect of crystal growth and reduction of central equiaxed crystal ratio can avoid the accumulation of solute elements to the intergranular and center, reduce the segregation of slab elements, and enable the gear to be used on the diagonal of the continuous casting billet from the surface to the 3 / 8 diagonal. The carbon range is controlled within 0.015%, and the central carbon segregation index is within 1.05, which improves the stability of steel performance.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and relates to the production of continuous casting billets for gears, in particular to a method for reducing segregation during pouring of continuous casting billets for gears. Background technique [0002] Gear steel is mainly used in transmission parts of automobiles, engineering machinery and machinery manufacturing industry. It not only has good strength, toughness, wear resistance, and can well withstand impact, bending and contact stress, but also requires small deformation, high precision and Low noise. High-quality gear steel meets the four quality indicators of narrow hardenability bandwidth, high purity, fine and uniform grains, and good surface quality. [0003] During the continuous casting process, the movement state of the molten steel at the end of solidification of the slab is an important factor affecting the internal quality of the slab. Due to dendrite bridging, insuffic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18B22D11/22
CPCB22D11/18B22D11/182B22D11/22
Inventor 林鹏张洪才郑力宁翟万里印传磊许正周
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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