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Control method for internal condensation structures of gear steel rectangular blanks

A control method and technology of solidification structure, which is applied in the field of control of solidification structure inside a rectangular billet of gear steel, can solve problems such as segregation bands entering the tooth area, uneven deformation of the tooth portion after quenching heat treatment, etc., to reduce the interface area, reduce the center, etc. The effect of axial crystal region and enlarged columnar crystal region

Active Publication Date: 2019-04-16
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally believed that if the square width of the steel segregation zone is less than 1 / 2 of the radius of the raw material, the thermal deformation of the product will not be greatly affected. If the width of the segregation zone is greater than 1 / 2 of the radius of the raw material, the segregation zone may enter the tooth area, resulting The uneven deformation of the internal quenching heat treatment will have a great impact on the accuracy and performance of the gear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Select a 260mm*300mm specification section, and control the 260mm*300mm specification section according to the embodiment of the present invention to control the internal solidification structure of the gear steel rectangular billet. The method mainly includes the following steps:

[0019] Low-speed casting mode; according to the rectangular billet specification section, the casting speed is controlled to 0.52m / min; and,

[0020] The fan-shaped section adopts a medium-strong secondary cooling control mode; according to the specification and section of the rectangular billet, the cooling water flow rate of the secondary cooling zone 0 is controlled to 33L / min, the cooling water flow rate of the secondary cooling zone 1 is 26L / min, and the cooling water flow rate of the secondary cooling zone 2 is 19L / min 1. The cooling water flow rate of the secondary cooling and the third zone is 17L / min; the specific water volume of the secondary cooling is controlled to 0.30L / Kg; and, ...

Embodiment 2

[0024] Select a 260mm*300mm specification section, and control the 260mm*300mm specification section according to the embodiment of the present invention to control the internal solidification structure of the gear steel rectangular billet. The method mainly includes the following steps:

[0025] Low-speed casting mode; according to the rectangular billet specification section, the casting speed is controlled to 0.50m / min; and,

[0026] The fan-shaped section adopts a medium-strong secondary cooling control mode; according to the specification and section of the rectangular billet, the cooling water flow rate of the secondary cooling zone 0 is controlled to 35L / min, the cooling water flow rate of the secondary cooling zone 1 is 28L / min, and the cooling water flow rate of the secondary cooling zone 2 is 21L / min 1. The cooling water flow rate of the secondary cooling and the third zone is 19L / min; the specific water volume of the secondary cooling is controlled to 0.34L / Kg; and ...

Embodiment 3

[0030] Select a 180mm*220mm specification section, and control the 180mm*220mm specification section according to the embodiment of the present invention to control the internal solidification structure of the gear steel rectangular billet. The method mainly includes the following steps:

[0031] Low-speed casting mode; according to the rectangular billet specification section, control the casting speed to 1.00m / min; and,

[0032] The fan-shaped section adopts a medium-strong secondary cooling control mode; according to the specification and section of the rectangular billet, the cooling water flow rate of the secondary cooling zone 0 is controlled to 32L / min, the cooling water flow rate of the secondary cooling zone 1 is 25 / min, and the cooling water flow rate of the secondary cooling zone 2 is 18L / min 1. The cooling water flow rate of the secondary cooling and the third zone is 16L / min; the specific water volume of the secondary cooling is controlled to 0.30L / Kg; and,

[003...

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Abstract

The invention discloses a control method for internal condensation structures of gear steel rectangular blanks. The control method comprises specific steps of low-pulling-speed casting, medium-strength secondary cooling control of a fan-shaped section, weakening of an electric stirring effect of a crystallizer and strengthening of the electric stirring effect of a terminal. The control method forthe internal condensation structures of the gear steel rectangular blanks can effectively enlarge internal columnar crystal areas of casting blanks to reduce center isometric crystal areas; and the internal columnar crystal areas of the casting blanks are not smaller than 70%, so that the intersecting areas between the columnar crystal areas and the center isometric crystal areas are reduced, andthe influence on the product quality by component segregation and inclusion collection in the intersecting places between the columnar crystal areas and the center isometric crystal areas is reduced.

Description

technical field [0001] The invention relates to the field of continuous casting, in particular to a method for controlling the internal solidification structure of a gear steel rectangular billet. Background technique [0002] With the vigorous development of my country's automobile industry, while the output of gear steel has increased significantly, the quality requirements have become increasingly strict and demanding, including the hardenability, non-metallic inclusions and microstructure of gear steel. higher and higher requirements. [0003] During the continuous casting solidification process of gear steel molten steel, due to the existence of the temperature gradient in the solidification direction of the slab, three solidification structures are usually formed: small equiaxed crystal regions at the edge, columnar crystal regions and central equiaxed crystal regions; Influenced by this, composition segregation and inclusion aggregation tend to occur at the junction o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D11/16B22D11/22
CPCB22D11/115B22D11/16B22D11/225
Inventor 赵冠夫戈文英周宪海赵子茂杨密平刘兵梁娜马传庆李玉华
Owner SHANDONG IRON & STEEL CO LTD
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