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A control method of gear steel strip structure and gear steel

A banded structure and control method technology, applied in the field of iron and steel metallurgy manufacturing, can solve the problem that the level of the banded structure of gear steel cannot be fully satisfied, and achieve good cooling effect, low production cost, and the effect of suppressing component segregation

Active Publication Date: 2018-04-27
SUZHOU SUXIN SPECIAL STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the technical problem that the banded structure level of gear steel in the prior art cannot fully meet the requirements of high-end narrow hardenability carburized gear steel, thereby providing a banded structure level Method for controlling the banding structure of gear steels with low, stable and narrow hardenability bands

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a method for controlling the banded structure of the gear steel. The method of comprehensively controlling the heating, rolling and cooling processes of the gear steel is used to realize the control of the banded structure of the gear steel, which specifically includes the following steps:

[0030] Heating steps before rolling: place the billet in a heating furnace for heating, the temperature of the heating furnace in the preheating section is controlled at 900°C; the temperature of the heating furnace in the heating section is controlled at 1190°C; the temperature of the heating furnace in the soaking section is controlled at 1210°C °C; the overall heating time of the billet in the heating furnace is 5 hours;

[0031] Rolling steps: send the heated slab into the rolling mill, and carry out preliminary rolling, intermediate rolling, and finishing rolling in sequence; the initial rolling temperature is controlled at 1170°C, and the intermediate r...

Embodiment 2

[0038] This embodiment provides a method for controlling the banded structure of the gear steel. The method of comprehensively controlling the heating, rolling and cooling processes of the gear steel is used to realize the control of the banded structure of the gear steel, which specifically includes the following steps:

[0039] Heating steps before rolling: place the billet in a heating furnace for heating, the temperature of the heating furnace in the preheating section is controlled at 850°C; the temperature of the heating furnace in the heating section is controlled at 1130°C; the temperature of the heating furnace in the soaking section is controlled at 1150°C °C; the overall heating time of the billet in the heating furnace is 3 hours;

[0040]Rolling steps: send the heated slab into the rolling mill, and carry out initial rolling, intermediate rolling, and finishing rolling in sequence; the initial rolling temperature is controlled at 1130°C, the intermediate rolling te...

Embodiment 3

[0047] This embodiment provides a method for controlling the banded structure of the gear steel. The method of comprehensively controlling the heating, rolling and cooling processes of the gear steel is used to realize the control of the banded structure of the gear steel, which specifically includes the following steps:

[0048] Heating steps before rolling: place the billet in a heating furnace for heating, the temperature of the heating furnace in the preheating section is controlled at 860°C; the temperature of the heating furnace in the heating section is controlled at 1190°C; the temperature of the heating furnace in the soaking section is controlled at 1180°C °C; the overall heating time of the billet in the heating furnace is 4 hours;

[0049] Rolling steps: send the heated billet into the rolling mill, and carry out preliminary rolling, intermediate rolling and finishing rolling in sequence; the starting rolling temperature of the preliminary rolling is controlled at 1...

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Abstract

The invention relates to a control method for banded structures of gear steel. Comprehensive control is conducted by heating, rolling and cooling the gear steel, and thus control over the banded structures of the gear steel is achieved. The control method specifically comprises the step of heating before rolling, the step of rolling, and the step of cooling after rolling. According to the control method for the banded structures of the gear steel, by adopting the proper heating technique before rolling, the rolling technique and the cooling technique after rolling, the grade of the banded structures of the gear steel is lowered to 2.0 or below, the requirement for narrow hardenability of the gear steel is met; and in addition, the hardenability of the gear steel is more stable. The control method for the banded structures of the gear steel is simple in production technique and low in production cost.

Description

technical field [0001] The invention relates to a method for controlling the strip structure of gear steel and gear steel, belonging to the technical field of iron and steel metallurgy manufacturing. Background technique [0002] Gear steel is the main material for manufacturing gears. During the solidification process of gear steel, due to the separation of crystallization, the composition of the billet will be uneven in the transverse and longitudinal sections. (Ferrite and pearlite) are distributed in layers, that is, a banded structure is formed, which in turn affects the stability of the hardenability of the steel. [0003] Chinese patent document CN101381803B discloses a method for controlling the strip structure of gear steel. The method adopts molten iron pretreatment→converter primary smelting→ladle refining furnace refining or ladle refining furnace+vacuum degassing furnace refining→continuous casting process to produce gear steel. Cast billets, after heating the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06
Inventor 徐益峰
Owner SUZHOU SUXIN SPECIAL STEEL
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