Large section gear steel continuous casting round billet heating process

A technology of continuous casting round billet and heating process, which is applied in the field of metallurgical engineering, and can solve problems such as excessive band structure, potential safety hazards in use, and reduced reliability and service life of gears.

Inactive Publication Date: 2021-04-09
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Gear steel requires reliability, safety, and a long service life. The existence of banded structures in steel can significantly affect the performance of gear steel, reduce the reliability and service life of gears, and bring safety hazards to use.
[0004] The heating process of the continuous casting slab of gear steel is actually to improve the defects such as uneven structure, composition segregation and internal stress produced in the continuous casting process, which plays a vital role in improving the strip structure of gear steel. If the heating process is not If it is reasonable, it will lead to coarse austenite grain size and excessive band structure in gear steel, which cannot meet the requirements of gear steel users.

Method used

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  • Large section gear steel continuous casting round billet heating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The φ650mm gear steel continuous casting round billet is put into the heating furnace to start heating in the preheating stage I. At this time, the temperature in the preheating stage I is 550°C, and the billet is heated in the preheating stage I for 3.0 hours, and enters the heating stage I;

[0023] At this time, the temperature of the heating section I is 1060°C, and the billet is heated for 1.5 hours in the heating section I, and enters the heating section II;

[0024] At this time, the temperature of the heating section II is 1230°C, and the billet is heated in the heating section II for 2.5 hours, and the high temperature diffusion time is 1.5h, and enters the soaking section;

[0025] At this time, the temperature in the soaking section is 1210° C., and the heating is carried out in the soaking section for 2.0 hours.

[0026] The total heating time from loading to firing of the φ650mm gear steel continuous casting round billet is 9 hours, and the high temperature...

Embodiment 2

[0029] The φ650mm gear steel continuous casting round billet is loaded into the heating furnace to start heating in the preheating stage I. At this time, the temperature in the preheating stage I is 850°C. The billet is heated in the preheating stage I stage for 3 hours, and enters the heating stage I;

[0030] At this time, the temperature in the heating section I is 1170°C, and the billet is heated in the heating section I for 1.5 hours, and then enters the heating section II;

[0031] At this time, the temperature in the heating section II is 1270°C, the billet is heated in the heating section II for 2.5 hours, and the high temperature diffusion time is 1.5h, and enters the soaking section;

[0032] At this time, the temperature in the soaking section is 1240° C., and the heating is carried out in the soaking section for 2 hours.

[0033] The total heating time from loading to firing of the φ650mm gear steel continuous casting round billet is 9 hours, and the high temperatu...

Embodiment 3

[0036] The φ650mm gear steel continuous casting round billet is loaded into the heating furnace to start heating in the preheating stage I. At this time, the temperature in the preheating stage I is 750°C, and the billet is heated in the preheating stage I for 4 hours, and enters the heating stage I;

[0037] At this time, the temperature of the heating section I is 1120°C, and the billet is heated for 2.0 hours in the heating section I, and enters the heating section II;

[0038] At this time, the temperature in the heating section II is 1250°C, the billet is heated in the heating section II for 3.0 hours, and the high temperature diffusion time is 2.0h, and enters the soaking section;

[0039] At this time, the temperature in the soaking section was 1230° C., and the heating was carried out in the soaking section for 3.0 hours.

[0040] The total heating time from the furnace loading to the discharge of the φ650mm gear steel continuous casting round billet is 12 hours, and t...

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Abstract

The invention discloses a large section gear steel continuous casting round billet (the diameter Phi of a section is 650 mm) heating process. The process comprises a preheating section, a heating section I, a heating section II and a soaking section. On the premise of not generating overburning and surface cracks, the large section gear steel continuous casting round billet heating process is designed to meet heating and rolling production of the large section gear steel continuous casting round billet, thereby meeting a demand of a gear steel user on grain size greater than or equal to 6.0 grade and a banded structure smaller than or equal to 2.5 grade.

Description

technical field [0001] The invention belongs to the field of metallurgical engineering, and in particular relates to a heating process for continuous casting round blanks of large-section gear steel. Background technique [0002] Gear steel is the key material for gears and gear shafts in the transmission of automobiles, railways, ships, and construction machinery. It is the manufacturing material for core components that ensure safety. It has strict quality requirements and requires good hardenability and austenite grain size. And ≤ 2.5 banded structure. [0003] Gear steel requires reliability, safety and a long service life. The existence of banded structures in steel can significantly affect the performance of gear steel, reduce the reliability and service life of gears, and bring safety hazards to use. [0004] The heating process of the continuous casting slab of gear steel is actually to improve the defects such as uneven structure, composition segregation and intern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/00
CPCC21D1/00C21D2211/005C21D2211/009
Inventor 陈良袁本明王允王宗斌李浩秋石军强尹崇丽
Owner SHANDONG IRON & STEEL CO LTD
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