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Banded structure control method, gear steel and formula thereof

A banded structure and control method technology, applied in the field of steel manufacturing, can solve the problem of reducing the banded structure of gear steel

Active Publication Date: 2019-10-11
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 embodiment of the present application is to provide a band structure control method, gear steel and its formula, which aims to solve the problem of how to reduce the band structure of gear steel

Method used

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  • Banded structure control method, gear steel and formula thereof
  • Banded structure control method, gear steel and formula thereof
  • Banded structure control method, gear steel and formula thereof

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°C, 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%; 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%; For 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 invention relates to the field of steel manufacturing, in particular to a banded structure control method, gear steel and a formula thereof. The banded structure control method comprises the stepsthat molten steel forms a casting blank through continuous casting by a crystallizer at constant pull speed; diffusion heating is conducted on the casting blank at the temperature of 1225-1255 DEG Ctill surface temperature and core temperature of the casting blank are even; and rolling of the down-pressing rate of 20%-30% is conducted on the casting blank obtained after diffusion heating at thetemperature of 1085-1205 DEG C. The continuous casting process, the diffusion heating process and the rolling process are controlled, austenite of the gear steel is fully deformed and homogenized fromthe surface to the core, and fine and even austenite particles are formed. Even-structure ferrite can be formed at the core and surface of the gear steel, and the banded structure is smaller than orequal to 2.0 grade.

Description

technical field [0001] The application relates to the field of iron and steel manufacturing, in particular, to a band structure control method, gear steel and its formula. 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 redu...

Claims

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Application Information

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Patent Type & Authority Applications(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
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