Method and device for heat treatment of steel ingot

Abstract

The invention discloses a method and device for heat treatment of a steel ingot. The heat treatment method comprises the following steps: 1. First heating: sending the steel ingot to a heat treatment furnace to be heated to 727-800°C; 2. First annealing: heating The final steel ingot is kept for 2 hours, and the furnace is cooled to 500-600° C. and then air-cooled. The invention can eliminate the stress inside the steel ingot, prevent the surface of the steel ingot from cracking, and reduce a certain hardness by performing sequential annealing treatment after the steel ingot is cast. Fire treatment refines the grains inside the ingot, increases the hardness and toughness of the ingot, and then anneals again to make the elements in the ingot diffuse in a solid state to reduce the inhomogeneity of chemical composition, mainly to reduce the inhomogeneity within the grain size. The uneven chemical composition makes the physical properties of each position of the steel ingot balanced, and through the heat treatment device, the steel ingot can be easily taken out of the furnace after heating, which is convenient for people to take out and load materials.

Description

technical field [0001] The invention relates to the technical field of heat treatment of steel ingots, in particular to a method and a device for heat treatment of steel ingots. Background technique [0002] The molten steel is injected 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 ingots or billets of a certain shape before processing. The process of casting a steel ingot with a mold is referred to as ingot casting, and the steel ingot is still the main raw material for steel rolling production. The quality of the ingot, the shape of the ingot and its weight play a very important role in the rolling production; [0003] During the production of steel ingots, the steel ingots are generally heat treated to improve its various properties and facilitate subsequent processing. For some steel ingots used for cutting, the hardness of the steel ingots needs to meet certain r...

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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

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