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Electroslag remelting and continuous unidirectional solidification method for tool and die steel production

A technology for electroslag remelting and die steel, which is applied in the field of metallurgy and can solve the problems of reducing material properties and scrapping ingots.

Inactive Publication Date: 2017-01-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the aggregation of these precipitates makes it easy to cause cracks during hot working, which leads to the scrapping of the ingot;

Method used

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  • Electroslag remelting and continuous unidirectional solidification method for tool and die steel production
  • Electroslag remelting and continuous unidirectional solidification method for tool and die steel production
  • Electroslag remelting and continuous unidirectional solidification method for tool and die steel production

Examples

Experimental program
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Effect test

Embodiment example 1

[0030] Electroslag remelting continuous directional solidification austenitic hot work die steel HMAS, the size of the electroslag ingot is φ160mm, the size of the base metal electrode is φ120mm, and the oxygen content of the base metal electrode is 25ppm.

[0031] Prepare slag: the mass percentage of slag is 70%CaF 2 -15%CaO-15%Al 2 o 3 , the drying residue temperature is 650°C, and the temperature is kept for 6 hours.

[0032] Arc ignition slag: place the arc ignition agent and part of the slag evenly in the center of the bottom water plate, and add 5kg of evenly mixed and baked slag into the crystallizer in batches and stages; The ignition arc starts to remelt.

[0033] Steady-state melting period: during the melting period, the voltage is 42V, the current is 3500A, the melting rate is controlled at 3kg / min, the cooling water inlet temperature of the crystallizer is 28°C, and the outlet water temperature is 57°C.

[0034] Feeding period: feeding is carried out 30 minute...

Embodiment example 2

[0039] Electroslag remelting continuous directional solidification high-speed steel M42, the size of the electroslag ingot is φ160mm, the size of the base metal electrode is φ120mm, and the oxygen content of the base metal electrode is 20ppm.

[0040] Prepare slag: the mass percentage of slag is 70%CaF 2 -15%CaO-15%Al 2 o 3 , The drying residue temperature is 630°C, and the temperature is kept for 8 hours.

[0041] Arc ignition slag: place the arc ignition agent and part of the slag evenly in the center of the bottom water plate, and add 5kg of evenly mixed and baked slag into the crystallizer in batches and stages; The ignition arc starts to remelt.

[0042] Steady-state melting period: during the melting period, the voltage is 42V, the current is 3500A, the melting rate is controlled at 3kg / min, the cooling water inlet temperature of the crystallizer is 28°C, and the outlet water temperature is 57°C.

[0043] Feeding period: feeding is carried out 30 minutes before the e...

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PUM

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Abstract

The invention provides an electroslag remelting and continuous unidirectional solidification method for tool and die steel production. The method comprises the following steps: selecting metal electrodes, removing surface oxidation layers of the metal electrodes, and performing false electrode welding treatment; and then selecting slag, uniformly mixing, and adding the slag in the electroslag remelting process, wherein a molten metal pool for tool and die steel production is shallow and flat, and the depth is 10-20% of the diameter. According to the method, the harmful element content in tool and die steel can be effectively controlled; a cast ingot having the advantages of low inclusion content, high cleanliness, uniform composition, compact structure, low segregation and unidirectional solidification can be produced; and the cast ingot has favorable hot working plasticity.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an electroslag remelting continuous directional solidification method for producing tool and die steel. Background technique [0002] Tool and die steel is the basic process equipment for industrial production and an important symbol to measure the level of a country's manufacturing industry. High-quality tool and die steel requires that the content of harmful elements such as oxygen, sulfur, and phosphorus in the steel be reduced as much as possible during the production process, so as to obtain an ingot billet with low inclusion content, high purity, and uniform composition. Due to the high content of alloy elements in tool and die steel, severe element segregation is easy to occur during the solidification process, and coarse precipitates are easily formed in the solute atom-enriched area, which is difficult to completely eliminate through subsequent forging def...

Claims

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Application Information

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IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 李晶丁信芳史成斌祁永峰
Owner UNIV OF SCI & TECH BEIJING
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