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Banding Control Method, Gear Steel and Its Formulation

A technology of strip structure and control method, applied in the field of steel manufacturing, can solve problems such as reducing the strip structure of gear steel, and achieve the effect of improving strip segregation, sufficient deformation, and uniform core temperature and surface temperature

Active Publication Date: 2021-12-10
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present application is to provide a method for controlling the banding structure of gear steel, which aims to solve the problem of how to reduce the banding structure of gear steel

Method used

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  • Banding Control Method, Gear Steel and Its Formulation
  • Banding Control Method, Gear Steel and Its Formulation
  • Banding Control Method, Gear Steel and Its Formulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] A kind of gear steel provided by this embodiment, its component formula comprises:

[0114] C: 0.22%; Si: 0.25%; Mn: 0.82%; Cr: 1.22%; Mo: 0.38%; P: 0.013; S: 0.020; Al: 0.015%; N: 82ppm; .

[0115] Continuous casting process control: 320mm cross-section billet continuous casting process is controlled by constant temperature and constant casting speed. The superheat of molten steel is controlled at 23°C, the casting speed is 0.55m / min, the electromagnetic stirring parameters of the mold are controlled at 250A / 2.0Hz, and the last stirring electromagnetic Stirring parameters were 450A / 5.0Hz.

[0116] Slab diffusion heating control: the temperature in the high temperature section of the slab is 1251°C, the time in the high temperature section is 373 minutes, and the total heating time is 586 minutes.

[0117] Billet rolling control: rough rolling rolling temperature 1203-1100 ℃, rolling 6 passes, single pass reduction rate 20-30%.

Embodiment 2

[0119] A kind of gear steel provided by this embodiment, its component formula comprises:

[0120] C: 0.20%; Si: 0.23%; Mn: 0.85%; Cr: 1.16%; Mo: 0.42%; P: 0.014%; S: 0.018%; Al: 0.021%; N: 94ppm; For Fe.

[0121] Continuous casting process control: 320mm section slab continuous casting process is controlled by constant temperature and constant casting speed. The superheat of molten steel is controlled at 25°C, the casting speed is 0.55m / min, the electromagnetic stirring parameters of the mold are controlled at 250A / 2.0Hz, and the last stirring electromagnetic Stirring parameters were 450A / 5.0Hz.

[0122] Slab diffusion heating control: the temperature in the high temperature section of the slab is 1249°C, the time in the high temperature section is 394min, and the total heating time is 592min.

[0123] Slab rolling control: rough rolling rolling temperature 1195-1089 ℃, rolling 6 passes, single pass reduction rate 20-30%.

Embodiment 3

[0125] A kind of gear steel provided by this embodiment, its component formula comprises:

[0126] C: 0.19%; Si: 0.24%; Mn: 0.89%; Cr: 1.18%; Mo: 0.41%; P: 0.011%; S: 0.025%; Al: 0.018%; N: 103ppm; The amount is Fe.

[0127] Continuous casting process control: 320mm section slab continuous casting process is controlled by constant temperature and constant casting speed. The superheat of molten steel is controlled at 21°C, the casting speed is 0.55m / min, the electromagnetic stirring parameters of the mold are controlled at 250A / 2.0Hz, and the last stirring electromagnetic Stirring parameters were 450A / 5.0Hz.

[0128] Slab diffusion heating control: the temperature in the high temperature section of the slab is 1243°C, the time in the high temperature section is 406min, and the total heating time is 579min.

[0129] Slab rolling control: rough rolling rolling temperature 1194-1095 ℃, rolling 6 passes, single pass reduction rate 20-30%.

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Abstract

The present application relates to the field of steel manufacturing, in particular, to a method for controlling the band structure of gear steel. A method for controlling the band structure of gear steel, comprising: continuously casting molten steel through a crystallizer at a constant casting speed to form a slab; diffusing and heating the slab at 1243-1255°C until the surface temperature and core temperature of the slab are uniform ; At 1089~1205°C, the casting slab after diffusion heating is rolled at a reduction rate of 20‑30%. By controlling the continuous casting process, diffusion heating process and rolling process, the austenite of the gear steel is fully deformed and homogenized from the surface to the core, forming fine and uniform austenite grains. The core and surface of the gear steel can form ferrite with uniform structure, and the band structure is ≤2.0 grade.

Description

technical field [0001] The present application relates to the field of steel manufacturing, in particular, to a method for controlling the band structure of gear steel. Background technique [0002] The banded structure makes the mechanical properties of the steel directional, and reduces the transverse ductility and reduction of area of ​​the steel. Severe banded structure increases the difficulty of forging, heating and processing of gear parts, which leads to large heat treatment deformation of gears, and ultimately reduces gear performance and fatigue strength, or leads to scrapping of gear parts. With the increasing quality requirements of automotive gears, the requirements for the banded structure of steel are also higher. Some manufacturers with high performance requirements for gear steel have proposed that the banded structure of steel is not allowed to exceed level 2. [0003] However, at present, for some gear steels with low sulfur content, the method of reducin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/20B22D11/115C22C38/22C22C38/06C22C38/04C22C38/02C21D8/02
CPCB22D11/20B22D11/115C22C38/22C22C38/06C22C38/04C22C38/02C22C38/002C22C38/001C21D8/0205C21D8/0226C21D2211/001C21D2211/005
Inventor 刘年富黄铸铭钟芳华周成宏
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD