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Preparation method of molded casting steel ingots

A technology of steel ingot and die casting

Inactive Publication Date: 2021-03-23
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the control of chemical components is mainly focused on the refining of conventional scale cast steel ingots, and the control of hydrogen and nitrogen gas is a weak link; at present, domestic research on reducing the content of hydrogen and nitrogen in die steel and the interaction of chemical components affecting its life rare

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0026] The invention provides a method for preparing a die-cast steel ingot, comprising:

[0027] The scrap steel and pig iron raw materials are smelted in an electric arc furnace to obtain molten steel;

[0028] The molten steel is refined once in an LF ladle furnace to obtain molten alloy;

[0029] The alloy liquid is subjected to secondary refining in a vacuum refining furnace to obtain a refining liquid;

[0030] The refining solution is poured to obtain a die-cast steel ingot.

[0031] The method provided by the invention is suitable for the manufacture of die-casting steel ingots of plastic mold steel, especially for the preparation of medium-carbon plastic mold steel ingots containing chromium, nickel and molybdenum.

[0032] In the present invention, the iron and steel raw materials preferably include pig iron and steel scrap as iron sources, and the pig iron is preferably high-quality pig iron. In the present invention, the pig iron and steel scrap are preferably c...

Embodiment 1

[0110] Ingredients: High-quality pig iron and steel scrap, Ni plate with a purity of 99%, 50.6wt% high-Cr alloy, 70wt% high-manganese alloy, 50wt% vanadium-iron alloy, 60wt% molybdenum-iron alloy, high-quality pig iron (C≥3.5wt%, Mn≤0.50 wt%, P≤0.10wt%) in high-quality pig iron and steel scrap mass content is 40%, the mass content of steel scrap (C≤0.5wt%, Mn≤0.50wt%, P≤0.05wt%) in high-quality pig iron and steel scrap The content is 60%.

[0111] Eccentric bottom electric arc furnace smelting:

[0112] Technological process: charging, power transmission and melting, making high alkalinity (R=5.5) silicate oxide slag (components include CaO58wt%, SiO 2 11wt%, FeO 6.5wt%) dephosphorization to less than 0.006wt% at low temperature (1530°C), oxidative decarburization (oxidation temperature 1590°C, decarburization amount 0.4wt%); high temperature oxidation is required during the oxidation period, violent boiling, steel The boiling time of pure liquid is more than 10 minutes to ...

Embodiment 2

[0121] Ingredients: High-quality pig iron and steel scrap, Ni plate with a purity of 99%, 50.6wt% high-Cr alloy, 70wt% high-manganese alloy, 50wt% vanadium-iron alloy, 60wt% molybdenum-iron alloy, high-quality pig iron (C≥3.5wt%, Mn≤0.50 wt%, P≤0.10wt%) in high-quality pig iron and scrap steel mass content is 45%, the mass content of scrap steel (C≤0.5wt%, Mn≤0.50wt%, P≤0.05wt%) in high-quality pig iron and scrap steel The content is 55%.

[0122] Eccentric bottom electric arc furnace smelting:

[0123] Technological process: charging, power transmission and melting, making high alkalinity (R=4.8) silicate oxide slag (components include CaO56wt%, SiO 2 10wt%, FeO 8wt%) low temperature (1520°C) dephosphorization to less than 0.006wt%, oxidative decarburization (oxidation temperature 1580°C, decarburization amount 0.30wt%); high temperature oxidation is required during the oxidation period, violent boiling, molten steel The pure boiling time is more than 10 minutes to facilit...

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Abstract

The invention provides a preparation method of molded casting steel ingots. The method comprises the following steps: smelting waste steel and pig iron raw materials by using an electric arc furnace to obtain steel liquid; performing primary refining on the steel liquid by adopting a ladle furnace LF to obtain alloy liquid; performing secondary refining on the alloy liquid by using a vacuum refining furnace to obtain refined liquid; and pouring the refined liquid to obtain the molded casting steel ingots. According to the method provided by the invention, hydrogen and nitrogen content in steelingots of the plastic mould steel can be effectively controlled to reach lower level, so that improvement and maintenance of the comprehensive performance of massive modules of the plastic mould steel can be facilitated, and the method has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of die steel preparation, and in particular relates to a method for preparing die cast steel ingots. Background technique [0002] High hydrogen content is the main cause of white spot defects in steel products, making the products scrapped; die steel with high nitrogen content will become brittle if left for a long time, and at the same time, the impact toughness, plasticity, formability and welding performance of the steel will be significantly reduced. In the medium carbon plastic mold steel, the brittleness caused by the high hydrogen and nitrogen content of the steel ingot is very serious. [0003] Medium-carbon chromium-containing plastic mold steel contains Cr, Ni, Mo and other alloying elements, which have high hardenability; and, because the steel contains Ni, Cr and other alloying elements, the series of elements are symbiotic with hydrogen and nitrogen. Very easy to absorb hydrogen and nitrogen. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C5/52C21C7/10C21C7/06C21C7/076B22D7/00
CPCB22D7/00C21C5/52C21C7/06C21C7/076C21C7/10C22C33/04Y02P10/20
Inventor 岳振峰唐远昭陈小波
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL