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Method for preparing H13 steel by electroslag remelting of electric conducting crystallizer

A technology of electroslag remelting and crystallizer, which is applied in the field of electroslag remelting and smelting, can solve problems such as difficult to obtain surface quality and internal quality, achieve good surface quality and internal quality, reduce the content of impurity elements, and avoid poor surface quality. poor effect

Active Publication Date: 2017-02-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that it is difficult to obtain H13 steel electroslag ingots with good surface quality and internal quality by using traditional electroslag remelting technology, the present invention provides a method for preparing H13 steel by electroslag remelting using conductive crystallizer technology. A shallow and flat molten metal pool can be obtained to reduce the degree of segregation of easily segregated elements. At the same time, it can also make the height of the cylindrical section of the molten metal pool suitable, and obtain a thin and uniform slag skin, thus effectively ensuring the surface of the electroslag remelted H13 steel quality and internal quality

Method used

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  • Method for preparing H13 steel by electroslag remelting of electric conducting crystallizer
  • Method for preparing H13 steel by electroslag remelting of electric conducting crystallizer
  • Method for preparing H13 steel by electroslag remelting of electric conducting crystallizer

Examples

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Effect test

Embodiment 1

[0054] A method for preparing H13 steel by electroslag remelting of a conductive mold. The diameter of the conductive mold is 350 mm. The schematic diagram of the electroslag remelting of the conductive mold is as follows figure 1 As shown, it specifically includes the following steps:

[0055] Step 1, preparing slag:

[0056] Fluorite, lime, alumina and fused magnesia are used as raw materials to prepare slag, so that the mass percentage of slag is: CaF 2 : 55%, CaO: 20%, Al 2 o 3 : 22%, MgO: 3%, the quality of slag is 24kg;

[0057] Step 2, baking slag:

[0058] Use a box-type resistance furnace to heat the slag at 600°C for 6 hours, and take it out as needed;

[0059] Step 3, prepare ingredients:

[0060] (1) Place the arc ignition ring made of the same material as H13 steel in the bottom water tank of the electroslag furnace, and place the arc ignition agent on the arc ignition ring; among them, the arc ignition agent is CaF 2 and TiO 2 Arc cuttings prepared from a...

Embodiment 2

[0077] A kind of conductive crystallizer electroslag remelting prepares H13 steel, and the diameter of its conductive crystallizer is 280mm, specifically comprises the following steps:

[0078] Step 1, preparing slag:

[0079] Fluorite, lime, alumina and fused magnesia are used as raw materials to prepare slag, so that the mass percentage of slag is: CaF 2 : 52%, CaO: 21%, Al 2 o 3 : 23%, MgO: 4%, the quality of slag is 16kg;

[0080] Step 2, baking slag:

[0081] Use a box-type resistance furnace to heat the slag at 700 ° C for 5 hours, and take it out as needed;

[0082] Step 3, prepare ingredients:

[0083] (1) Place the arc ignition ring made of the same material as H13 steel in the bottom water tank of the electroslag furnace, and place the arc ignition agent on the arc ignition ring; among them, the arc ignition agent is CaF 2 and TiO 2 Arc cuttings prepared from a mixture, by mass ratio, CaF 2 :TiO 2 =(40~60):(40~60);

[0084] (2) Evenly add the baked slag int...

Embodiment 3

[0100] A kind of conductive crystallizer electroslag remelting prepares H13 steel, and the diameter of its conductive crystallizer is 600mm, specifically comprises the following steps:

[0101] Step 1, preparing slag:

[0102] Fluorite, lime, alumina and fused magnesia are used as raw materials to prepare slag, so that the mass percentage of slag is: CaF 2 : 54%, CaO: 24%, Al 2 o 3 : 20%, MgO: 2%, the quality of slag is 72kg;

[0103] Step 2, baking slag:

[0104] Use a box-type resistance furnace to heat the slag at 800 ° C for 5 hours, and take it out as needed;

[0105] Step 3, prepare ingredients:

[0106] (1) Place the arc ignition ring made of the same material as H13 steel in the bottom water tank of the electroslag furnace, and place the arc ignition agent on the arc ignition ring; among them, the arc ignition agent is CaF 2 and TiO 2 Arc cuttings prepared from a mixture, by mass ratio, CaF 2 :TiO 2=(40~60):(40~60);

[0107] (2) Evenly add the baked slag into...

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Abstract

The invention discloses a method for preparing H13 steel by electroslag remelting of an electric conducting crystallizer. The method comprises the following steps: 1) fluorite, lime, aluminum oxide and fused magnesite are used as raw materials, and are mixed to obtain slag; 2) the slag is baked; 3) an arc striking ring, an arc striking agent and the slag are put; 4) through switching-on and switching-off, a current path adopts power supply-consumable electrode-slag-bottom water tank-power supply; and the arc striking is slagged under protection of inert gas; 5) when the slag is totally fused, through switching-on and switching-off, the current path adopts power supply-consumable electrode-slag pool-electric conducting crystallizer-power supply; under protection of the inert gas, the electric conducting crystallizer is started for electroslag remelting; and aluminum particles are added for deoxidation; and 6) when the electroslag remelting feeding is finished, a gas valve is closed; a steel ingot is obtained by demolding; and the steel ingot is annealed and cooled along with a furnace to obtain the H13 steel. The method solves the problem of poor surface quality due to low-melting-speed smelting in a traditional electroslag remelting technology, and adopts the electric conducting crystallizer and changes the current path to obtain an electroslag ingot with excellent surface and internal quality.

Description

technical field [0001] The invention belongs to the technical field of electroslag remelting, in particular to a method for preparing H13 steel by electroslag remelting in a conductive crystallizer. Background technique [0002] As an important part of die steel, hot work die steel is mainly used to manufacture dies that are pressed and formed from solid metal or high-temperature liquid metal heated to above the recrystallization temperature. H13 steel is an air-cooled hardening hot work die steel widely used in the world. It has high strength and good thermal fatigue performance at high temperature. It is often used to manufacture various hammer forging dies, hot extrusion dies, die-casting dies and other dies. . [0003] As a means of smelting high-quality steel ingots, electroslag remelting technology has advantages that cannot be replaced by other steelmaking methods due to its excellent reaction conditions and special crystallization methods, and can further improve th...

Claims

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Application Information

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IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 姜周华刘福斌李星耿鑫余嘉陈奎彭辉
Owner NORTHEASTERN UNIV
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