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Method for preparing H13 steel through electroslag remelting

An electroslag remelting and remelting technology, which is applied in the metallurgical field, can solve the problems of difficulty in meeting the requirements of high-quality die steel, secondary oxidation of molten steel, and reducing the yield of rare earths.

Active Publication Date: 2021-10-29
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of equipment and smelting technology level, the electroslag remelting process can easily cause secondary oxidation of molten steel, and the burning loss of rare earths in the electroslag remelting process will reduce the yield of rare earths in steel, making the The rare earth yield is unstable and uncontrollable, and there are many structural problems in the steel parts, which makes it difficult to meet the requirements for the use of high-quality die steel

Method used

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  • Method for preparing H13 steel through electroslag remelting
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  • Method for preparing H13 steel through electroslag remelting

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preparation example Construction

[0039] The method for preparing the consumable electrode is not particularly limited in the present invention, and the method for preparing the consumable electrode of H13 steel well known in the art can be adopted.

[0040] In the present invention, the pre-melted slag includes the following components in mass percentage: CaF 2 40-50 parts, CaO 15-30 parts, rare earth oxide 20-30 parts, Al 2 o 3 5-15 parts, 1-3 parts of MgO and 3-5 parts of NaF, preferably CaF 243-48 parts, CaO 18-25 parts, rare earth oxide 23-28 parts, Al 2 o 3 8 to 12 parts, 1.5 to 2.5 parts of MgO and 3.5 to 4.5 parts of NaF. In the present invention, by adjusting the composition of the pre-melting slag, that is, calcium-aluminum compound as the main body, adding rare earth oxides and controlling its content within the above range, the steel slag interaction and reducing agent addition at high temperature of electroslag remelting The reduction of rare earth oxides finally makes the rare earth elements...

Embodiment 1

[0072] Using H13 steel to be treated as a consumable electrode, using pre-melted slag and a reducing agent to perform electroslag remelting on the consumable electrode to obtain H13 steel;

[0073] Among them, the consumable electrode is composed of the following components in mass percentage: C 0.40%, Si 1.10%, Mn 0.40%, Cr 5.25%, Mo 1.35%, V 0.9%, O 0.002%, S 0.0019%, P 0.02% and the balance Fe; the target rare earth content of H13 steel is 0.022%;

[0074] The pre-slag is composed of the following components in mass percentage: CaF 2 40%, rare earth oxide 25% (rare earth oxide is made of 20% CeO by mass percentage 2and 80% La 2 o 3 Composition), CaO 19%, Al 2 o 3 10%, MgO 3% and NaF 3%;

[0075] The reducing agent is composed of the following components in mass percentage: Si 62.0%, Ca 27.2% and the balance Fe.

[0076] The amount of reducing agent and pre-slag has a relationship as shown in formula I; the amount of pre-slag used is calculated according to formula II...

Embodiment 2

[0083] This embodiment requires that the target rare earth La content of H13 steel is 0.018%; the pre-slag component in Example 1 is replaced by the following mass percentage components: CaF 2 40%, La 2 o 3 20%, CaO 20%, Al 2 o 3 15%, MgO 1% and NaF4%; other technical features are the same as in Example 1 to obtain the H13 steel S2 sample.

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Abstract

The invention provides a method for preparing H13 steel through electroslag remelting, and belongs to the technical field of metallurgy. According to the method for preparing the H13 steel through electroslag remelting, by adding pre-melting slag containing rare earth, meanwhile adding a silicon-calcium-iron reducing agent and controlling the adding amounts of the pre-melting slag and the silicon-calcium-iron reducing agent, the prepared H13 steel can be small in grain and uniform in structure, and the content of the rare earth in the steel can be stable and controllable; and meanwhile, no special requirements for electroslag remelting equipment and environment exist, the high-quality H13 steel can be prepared under limited conditions, the process is simple, easy to implement, safe and controllable, the method is more beneficial to large-scale production of the H13 steel, and the requirement for the high-quality H13 steel in China can be met.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing H13 steel by electroslag remelting. Background technique [0002] Die steel is mainly divided into plastic die steel, cold work die steel and hot work die steel according to the use and service conditions. Among them, hot work die steel is mainly used to manufacture dies for hot forming of metals in high temperature state, such as hot forging dies, Hot extrusion dies, die-casting dies, etc. H13 steel is a widely used variety of hot work die steel. High-quality H13 steel will be produced by electroslag remelting process. Some domestic manufacturers have adopted electroslag remelting technology when producing H13 steel. In technology, the steel to be processed can be smelted and poured as a consumable electrode. During this process, rare earths are added to improve the cleanliness, uniformity, isotropy and grain refinement of the steel. However, due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C38/02C22C38/04C22C38/22C22C38/24
CPCC22B9/18C22C38/02C22C38/04C22C38/22C22C38/24Y02P10/20
Inventor 李光强王强王肸杰陈雨飞刘昱周光富
Owner WUHAN UNIV OF SCI & TECH
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