Rolling method of low-banded structure gear steel

A banded structure and gear steel technology, applied in the direction of metal rolling, metal rolling, rolling mill control devices, etc., can solve the problem of not fully meeting the microhardness requirements of high-end hardenability carburized gear steel, and reduce the banded structure Level and other issues, to achieve the effects of low production cost, improved gear fatigue life, and simple process lines

Active Publication Date: 2015-04-08
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above technology is to reduce the level of banded structure by controlling the superheat and casting speed of the continuous casting slab to reduce the solidification and segregation of the continuous casting slab; or to reduce the level of the banded structure by controlling rolling or heat treatment, and the level of the banded structure It is controlled at 1.5~2.5 grades, which cannot fully meet the microhardness requirements of various parts of high-end hardenability carburized gear steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A rolling method of low-band structure gear steel, which comprises the following steps:

[0023] 1) Billet heating: the billet is heated in a three-stage heating furnace, and the temperatures of the three stages are: preheating section: 850°C; heating section: 1280°C; soaking section: 1260°C, and the heating time is 2.5 hours;

[0024] 2) Billet rolling: After the heated billet is dephosphorized by high-pressure water, it enters the rough rolling unit, the intermediate rolling unit, the water cooling unit, and the finishing rolling unit for rough rolling, intermediate rolling, water cooling and finishing rolling. The temperature of rough rolling is 1160°C; the temperature of intermediate rolling is 1100°C; the temperature of finish rolling is 970°C; after water cooling, the billet temperature is reduced by 250°C, and the cooling water pressure of water cooling is 1MPa;

[0025] 3) Cooling after rolling: the billet after finishing rolling is cooled by water and air cooli...

Embodiment 2

[0029] A rolling method of low-band structure gear steel, which comprises the following steps:

[0030] 1) Billet heating: the billet is heated in a three-stage heating furnace, and the temperatures of the three stages are: preheating section: 780°C; heating section: 1270°C; soaking section: 1250°C, and the heating time is 3 hours;

[0031] 2) Billet rolling: After the heated billet is dephosphorized by high-pressure water, it enters the rough rolling unit, the intermediate rolling unit, the water cooling unit, and the finishing rolling unit for rough rolling, intermediate rolling, water cooling and finishing rolling. The temperature of rough rolling is 1150°C; the temperature of intermediate rolling is 1050°C; the temperature of finish rolling is 950°C; the temperature of billet after water cooling is reduced by 220°C, and the cooling water pressure of water cooling is 1.2MPa;

[0032] 3) Cooling after rolling: the steel billet after finishing rolling is subjected to water co...

Embodiment 3

[0036] A rolling method of low-band structure gear steel, which comprises the following steps:

[0037] 1) Billet heating: the billet is heated in a three-stage heating furnace, and the temperatures of the three stages are: preheating section: 800°C; heating section: 1260°C; soaking section: 1250°C, and the heating time is 2.8 hours;

[0038] 2) Billet rolling: After the heated billet is dephosphorized by high-pressure water, it enters the rough rolling unit, the intermediate rolling unit, the water cooling unit, and the finishing rolling unit for rough rolling, intermediate rolling, water cooling and finishing rolling. The temperature of rough rolling is 1140°C; the temperature of intermediate rolling is 1070°C; the temperature of finish rolling is 940°C; the temperature of billet after water cooling is reduced by 200°C, and the cooling water pressure of water cooling is 1.3MPa;

[0039] 3) Cooling after rolling: the steel billet after finishing rolling is cooled by water and...

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PUM

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Abstract

The invention discloses a rolling method of low-banded structure gear steel. The method comprises the following steps of: (1) heating a steel blank within a three-section type heating furnace; (2) carrying out dephosphorization on the heated steel blank by high-pressure water, and sequentially carrying out rough rolling, intermediate rolling, water cooling, and finish rolling; (3) water-cooling and air-cooling the finish-rolled steel blank sequentially; and (4) slowly cooling the cooled round bar steel to be lower than 200DEG C after shearing. Due to the use of the rolling method, the production technology difficulty that the level of the high-end hardenability carburized gear steel banded structure is hard to lower due to the conventional rolling technology can be overcome, so that that the level of the banded structure of the gear steel is lowered to be lower than 1.0 grade from 3.0 grade of the conventional rolling technology, and therefore, the aim of prolonging the fatigue life of the gear can be achieved. The rolling method further has the characteristics of being simple in technical route, low in production cost, high in operability and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgical manufacture, and in particular relates to a rolling method of gear steel with low band structure. Background technique [0002] Gear steel is an important mechanical part. During the smelting and solidification process of gear steel, due to the effect of segregation and crystallization, the inhomogeneity of the composition will be caused in the horizontal and vertical directions of the billet solidification. The layered distribution of the formed structure (ferrite and pearlite) is the banded structure. The existence of the banded structure makes the structure of the steel uneven, affects the properties of the steel, forms anisotropy, and reduces the plasticity, impact toughness and section of the steel. Shrinkage rate, resulting in cold bending failure, high impact rejection rate. Severe banded structure not only increases the deformation after heat treatment of the gear, but also causes d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/13B21B37/00
Inventor 张贤忠陈庆丰黄海玲陈华强熊玉彰杜方尹志香
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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