Steel ingot heat treatment method and device

A heat treatment method and heat treatment device technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of inconvenient loading and unloading of steel ingots, low surface precision, inconvenient cutting, etc. Balanced performance and anti-cracking effect

Active Publication Date: 2020-12-29
山东润金重工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the production of steel ingots, the steel ingots are generally heat-treated to improve their performance and facilitate subsequent processing. For some steel ingots used for cutting, the hardness of the steel ingots needs to meet certain requirements to make the steel ingots easy to cut. If the hardness is too large, it will be difficult to cut, and if the hardness is too small, it will cause sticking to the knife, and the surface accuracy will be low;
[0004] When heat treating steel ingots, a heat treatment furnace is needed for heating, but the existing heat treatment furnaces are very inconvenient for loading and unloading steel ingots. Therefore, we propose a method and device for heat treatment of steel ingots

Method used

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  • Steel ingot heat treatment method and device
  • Steel ingot heat treatment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A steel ingot heat treatment method, the heat treatment method comprising the following steps:

[0036] 1. The first heating: send the steel ingot to the heat treatment furnace and heat it to 730°C;

[0037] 2. The first annealing: heat the heated steel ingot for 2 hours, cool the furnace to 500°C, and then take it out of the furnace for air cooling;

[0038] 3. The second heating: send the steel ingot to the heat treatment furnace and heat it to 750°C;

[0039] 4. Normalizing: keep the heated steel ingot for 1 hour, then cool it by blowing or spraying to 150°C;

[0040] 5. The third heating: send the steel ingot to the heat treatment furnace and heat it to 1100°C;

[0041] 6. The second annealing: keep the heated steel ingot for 6 hours, and cool the furnace to 200°C;

[0042] 7. Cooling: Cool the steel ingot with oil less than 60°C;

[0043] 8. Degreasing: Clean the grease on the surface of the steel ingot with a degreasing agent.

[0044] In the step 1, the stee...

Embodiment 2

[0059] A steel ingot heat treatment method, the heat treatment method comprising the following steps:

[0060] 1. The first heating: send the steel ingot to the heat treatment furnace and heat it to 760°C;

[0061] 2. The first annealing: heat the heated steel ingot for 2 hours, cool the furnace to 550°C and then take it out of the furnace for air cooling;

[0062] 3. The second heating: send the steel ingot to the heat treatment furnace and heat it to 800°C;

[0063] 4. Normalizing: keep the heated steel ingot for 1 hour, then cool it by blowing or spraying to 180°C;

[0064] 5. The third heating: send the steel ingot to the heat treatment furnace and heat it to 1100°C;

[0065] 6. The second annealing: keep the heated steel ingot for 6 hours, and cool the furnace to 200°C;

[0066] 7. Cooling: Cool the steel ingot with oil less than 60°C;

[0067] 8. Degreasing: Clean the grease on the surface of the steel ingot with a degreasing agent.

[0068] In said step 1, the stee...

Embodiment 3

[0075] A steel ingot heat treatment method, the heat treatment method comprising the following steps:

[0076] 1. The first heating: send the steel ingot to the heat treatment furnace and heat it to 790°C;

[0077] 2. The first annealing: heat the heated steel ingot for 2 hours, cool it to 600°C and then take it out of the furnace for air cooling;

[0078] 3. The second heating: send the steel ingot to the heat treatment furnace and heat it to 900°C;

[0079] 4. Normalizing: keep the heated steel ingot for 1 hour, and cool it by blowing or spraying to 200°C;

[0080] 5. The third heating: send the steel ingot to the heat treatment furnace and heat it to 1150°C;

[0081] 6. The second annealing: keep the heated steel ingot for 6 hours, and cool the furnace to 200°C;

[0082] 7. Cooling: Cool the steel ingot with oil less than 60°C;

[0083] 8. Degreasing: Clean the grease on the surface of the steel ingot with a degreasing agent.

[0084] In the step 1, the steel ingot is ...

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PUM

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Abstract

The invention discloses a steel ingot heat treatment method and device. The steel ingot heat treatment method comprises the following steps that 1, first heating: a steel ingot is conveyed into a heattreatment furnace to be heated to 727-800 DEG C; and 2, first annealing: the heated steel ingot is subjected to heat preservation for 2 h and subjected to furnace cooling to reach 500-600 DEG C, andthen the steel ingot is discharged out of the furnace and subjected to air cooling. According to the steel ingot heat treatment method and device, the steel ingot is sequentially subjected to annealing treatment after being cast, stress in the steel ingot can be eliminated, surface cracking of the steel ingot is prevented, certain hardness is reduced, grains in the steel ingot are refined throughnormalizing treatment, and the hardness and toughness of the steel ingot are improved; then through secondary annealing, elements in the steel ingot are subjected to solid diffusion, so that non-uniformity of chemical components is relieved, the non-uniformity of the chemical components in the grain size is mainly relieved, and the physical properties of all positions of the steel ingot are balanced; and by means of a heat treatment device, the steel ingot can be conveniently taken out of the furnace after being heated, and people can take and feed materials conveniently.

Description

technical field [0001] The invention relates to the technical field of steel ingot heat treatment, in particular to a steel ingot heat treatment method and device. Background technique [0002] The molten steel is poured into the mold through the ladle and solidified to form a steel ingot. After the molten steel is smelted in the steelmaking furnace, it must be cast into an ingot or billet of a certain shape before it can be processed. The process of casting steel ingots with molds is called ingot casting for short, and steel ingots are still the main raw material for rolling steel production. The quality of the steel ingot, the condition of the ingot shape and its weight play a very important role in the production of steel rolling; [0003] During the production of steel ingots, the steel ingots are generally heat-treated to improve their performance and facilitate subsequent processing. For some steel ingots used for cutting, the hardness of the steel ingots needs to me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/28C21D9/70
CPCC21D1/26C21D1/28C21D9/70C21D9/0018
Inventor 刘萍李谨娟李全君
Owner 山东润金重工科技有限公司
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