Gear steel banded structure control process

A banded structure and gear steel technology, which is applied in the field of iron and steel metallurgy manufacturing, can solve the problems of demanding gear steel, failing to meet high-quality gear steel users, and unable to fully reduce the banded structure of gear steel, so as to improve surface quality and suppress Diffusion of carbon and the effect of reducing water penetration resistance

A banded structure and gear steel technology, which is applied in the field of iron and steel metallurgy manufacturing, can solve the problems of demanding gear steel, failing to meet high-quality gear steel users, and unable to fully reduce the banded structure of gear steel, so as to improve surface quality and suppress Diffusion of carbon and the effect of reducing water penetration resistance

CN111424149AInactive Publication Date: 2020-07-17江苏联峰实业有限公司
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  • Gear steel banded structure control process
  • Gear steel banded structure control process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: billet heating: send the billet into the heating furnace and heat it in sections, the heating temperature is: preheating section: 750°C; heating stage: 900°C; heating stage two: 1180°C; soaking section: 1180°C; heating The time is 170 minutes, the temperature of the furnace is 1070-1240 ° C, and the heat is kept for 8 hours after the heating is completed;

[0031] Step 2: Rough rolling: the steel slab after heat preservation is dephosphorized by high-pressure water and then sent to the rough rolling unit. The rough rolling temperature is 1080°C;

[0032] Step 3: Intermediate rolling: Send the rough-rolled billet to the first intermediate rolling unit and the second intermediate rolling unit in sequence, the temperature of the first intermediate rolling is 1030°C, and the temperature of the second intermediate rolling is 970°C;

[0033] Step 4: Primary water cooling: send the middle-rolled billet to the first water cooling device for cooling, and the cooling rate...

Embodiment 2

[0039] Step 1: Steel billet heating: Send the billet into the heating furnace and heat it in sections. The heating temperatures are: preheating section: 760°C; heating stage: 1000°C; heating stage two: 1210°C; soaking section: 1210°C; The time is 170 minutes, the temperature of the furnace is 1070 ~ 1240 ° C, and the heat is kept for 9 hours after the heating is completed;

[0040] Step 2: Rough rolling: the steel slab after heat preservation is dephosphorized by high-pressure water and then sent to the rough rolling unit. The rough rolling temperature is 1100°C;

[0041] Step 3: Intermediate rolling: Send the rough-rolled billets to the first intermediate rolling unit and the second intermediate rolling unit in sequence, the temperature of the first intermediate rolling is 1050°C, and the temperature of the second intermediate rolling is 980°C;

[0042] Step 4: Primary water cooling: send the middle-rolled billet to the first water cooling device for cooling, and the cooling ...

Embodiment 3

[0048] Step 1: billet heating: put the billet into the heating furnace and heat it in sections. The heating temperature is: preheating section: 800°C; heating stage: 1100°C; heating stage two: 1240°C; soaking section: 1240°C; heating The time is 170 minutes, the temperature out of the furnace is 1070-1240 ℃, after the heating is completed, it is out of the furnace and kept for 10 hours;

[0049] Step 2: Rough rolling: send the heat-preserved steel slab to the rough rolling unit after dephosphorization by high-pressure water, and the rough rolling temperature is 1140°C;

[0050]Step 3: Intermediate rolling: Send the rough-rolled billet to the first intermediate rolling unit and the second intermediate rolling unit in sequence, the temperature of the first intermediate rolling is 1080°C, and the temperature of the second intermediate rolling is 990°C;

[0051] Step 4: Primary water cooling: send the middle-rolled billet to the first water cooling device for cooling, and the cool...

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Abstract

The invention provides a gear steel banded structure control process, and belongs to the technical field of ferrous metallurgy manufacturing. The process comprises the steps of steel billet heating, rough rolling, intermediate rolling, primary water passing cooling, finish rolling, secondary water passing cooling and slow cooling. The finish rolling temperature is set in an austenite non-recrystallization temperature area, ferrite grains are more refined after phase change, and the banded structure level can be effectively reduced; water passing cooling is carried out on a steel billet beforeand after finish rolling, and the metallographic structure and the surface quality of a product can be improved; rapid cooling is carried out before slow cooling after finish rolling, generation of proeutectoid ferrite can be effectively inhibited, diffusion of carbon is inhibited, the steel billet is rapidly cooled to a pearlite phase change area, and formation of a banded structure is reduced; the heated steel billet is subjected to heat preservation operation, component segregation of a steel billet material can be homogenized, and the banded structure is improved; and due to the arrangement of an injection channel and an injection angle in a water passing cooling device, the water passing resistance borne by the surface of the steel billet can be reduced, and the cooling efficiency isimproved.

Description

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Claims

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Application Information

Patent Timeline
17 Jul 2020
Publication
CN111424149A