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Method for smelting high-nitrogen die steel through vacuum induction furnace and pressurized electroslag furnace

A technology of vacuum induction furnace and pressurized slag, applied in the field of iron and steel metallurgy, can solve the problem of not forming large-scale industrial production, and achieve the effects of facilitating large-scale industrial production, reducing oxygen content and reducing costs

Active Publication Date: 2022-04-12
FUSHUN SPECIAL STEEL SHARES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of equipment and technology, high-nitrogen (nitrogen content above 0.20%) die steel at home and abroad has not formed large-scale industrial production

Method used

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  • Method for smelting high-nitrogen die steel through vacuum induction furnace and pressurized electroslag furnace
  • Method for smelting high-nitrogen die steel through vacuum induction furnace and pressurized electroslag furnace
  • Method for smelting high-nitrogen die steel through vacuum induction furnace and pressurized electroslag furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Vacuum induction furnace + pressurized electroslag furnace is used to smelt high-nitrogen mold steel Φ610mm electroslag ingot. The target steel grade is 40Cr13NiN0.3. The alloy composition and target value of electroslag ingot are shown in Table 1.

[0036] Table 1

[0037]

[0038] (1) According to the target composition and process requirements of the steel grade, the batching target of the vacuum induction furnace is implemented in accordance with Table 2.

[0039] Table 2

[0040]

[0041](2) Choose a vacuum induction furnace with a 6t crucible, and ensure that the argon pressure is at 20,000Pa during the argon filling stage. After the alloy composition reaches the target value, add 15kg of (FeCr)N to increase nitrogen, and add Ni-Mg and Si-Ca powder for deoxidation.

[0042] (3) The size of the electrode rod 4 is Φ400mm, and the oxide skin on the surface is cleaned.

[0043] ⑷Pressure electroslag furnace (see figure 1 ) during preparation, pave 5kg of (Fe...

Embodiment 2

[0052] Vacuum induction furnace + pressurized electroslag furnace is used to smelt high-nitrogen mold steel Φ610mm electroslag ingot. The target steel grade is 30Cr13NiN0.35. The alloy composition and target value of electroslag ingot are shown in Table 4.

[0053] Table 4

[0054]

[0055] ⑴According to the target composition and process requirements of the steel type, the batching target of the vacuum induction furnace is implemented according to Table 5:

[0056] table 5

[0057]

[0058] (2) Choose a vacuum induction furnace with a 6t crucible, and ensure that the argon pressure is at 20,000Pa during the argon filling stage. After the alloy composition reaches the target value, add 16kg of (FeCr)N for nitrogen increase, and add Ni-Mg and Si-Ca powder for deoxidation.

[0059] (3) The size of the electrode rod 4 is Φ400mm, and the oxide skin on the surface is cleaned.

[0060] ⑷ When preparing the pressurized electroslag furnace, lay 5kg of (FeCr)N on the bottom pa...

Embodiment 3

[0070] Vacuum induction furnace + pressurized electroslag furnace is used to smelt high-nitrogen mold steel Φ610mm steel ingot. The target steel grade is 30Cr15Mo1NiN0.4. The alloy composition and target value of electroslag ingot are shown in Table 7.

[0071] Table 7

[0072]

[0073] (1) According to the target composition and process requirements of the steel grade, the batching target of the vacuum induction furnace is implemented according to Table 8.

[0074] Table 8

[0075]

[0076] (2) Choose a vacuum induction furnace with a 6t crucible, and ensure that the argon pressure is at 25,000Pa during the argon filling stage. After the alloy composition reaches the target value, add 15kg of (FeCr)N to increase nitrogen, and add Ni-Mg and Si-Ca powder for deoxidation.

[0077] (3) The size of the electrode rod 4 is Φ400mm, and the oxide skin on the surface is cleaned.

[0078] ⑷ When preparing the pressurized electroslag furnace, lay 6kg of (FeCr)N on the bottom pad...

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Abstract

The invention discloses a method for smelting high-nitrogen die steel through a vacuum induction furnace and a pressurized electroslag furnace. The blank of the high-nitrogen die steel smelting process is filled. According to the technical scheme, a smelting method of a vacuum induction furnace and a pressurized electroslag furnace is adopted, and the die steel with the nitrogen content being 0.20%-0.40% is produced; two nitriding alloy materials (FeCr) N and Si3N4 are respectively added in the smelting process of a vacuum induction furnace and a pressurized electroslag furnace so as to achieve the technical requirement target of nitrogen. The method has the following advantages: (1) nitrogen is increased in the vacuum induction furnace, so that the addition of Si3N4 in a pressurized electroslag furnace in the later period can be reduced, the cost is reduced, and the uniformity and the qualification rate of nitrogen are improved; (2) Si3N4 added in pressurized electroslag remelting enables molten steel to obtain higher nitrogen content, process stability, accurate nitrogen element control and uniform distribution; the electrode bar is remelted and purified, so that the oxygen content of the steel ingot is further reduced, and the steel ingot has better structure and performance than other smelting modes; the production efficiency is high and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for smelting high-nitrogen mold steel in a vacuum induction furnace and a pressurized electroslag furnace. Background technique [0002] High nitrogen die steel is a special type of alloy steel, which belongs to martensitic stainless steel. Adding nitrogen to the composition can reduce element segregation of die steel, improve corrosion resistance, improve polishing performance, and improve cutting performance; nitrogen can increase the yield strength of alloy steel, and every 0.001% increase in nitrogen can increase about 6MPa strength, and has nothing to do with the process conditions. The use of new alloy ratios can also save the content of alloy elements in steel, which is an effective way to produce high-end die steel. Although the beneficial effect of nitrogen in steel has been confirmed, since the solubility of nitrogen in martensit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/06C22B9/04C22B9/18
CPCY02P10/25
Inventor 刘明牟风马野燕云冯淑玲汝亚彬孙秀华孙立国王琳康爱军刘宝石王海江冯涛谭凯龙晓东高强马兵刚谷强
Owner FUSHUN SPECIAL STEEL SHARES
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