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Pressurizing induction and pressurizing electroslag remelting duplex high-nitrogen steel smelting method

A pressurized induction and pressurized electroslag technology, applied in the field of high nitrogen steel smelting, can solve problems such as unstable nitrogen increase process, silicon increase in electroslag ingot, uneven nitrogen distribution in electroslag ingot, etc., to achieve low sulfur content, The effect of less non-metallic inclusions and uniform nitrogen distribution

Active Publication Date: 2016-10-12
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of increasing nitrogen by adding nitride alloys in pressurized electroslag remelting is unstable, and the distribution of nitrogen in the electroslag ingot is uneven, sometimes requiring secondary remelting. silicon

Method used

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  • Pressurizing induction and pressurizing electroslag remelting duplex high-nitrogen steel smelting method
  • Pressurizing induction and pressurizing electroslag remelting duplex high-nitrogen steel smelting method
  • Pressurizing induction and pressurizing electroslag remelting duplex high-nitrogen steel smelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 21.0kg of the target steel grade high-nitrogen martensitic stainless steel 30Cr15MoN0.4 was smelted by pressure induction and pressure electroslag remelting double-linked process. The composition control range and smelting control target are shown in Table 2.

[0045] Table 2 30Cr15MoN0.4 composition control range and control target / wt.%

[0046]

[0047] Specific steps are as follows.

[0048] Pressure induction melting stage:

[0049] (1) Determination of ingredients and pressure parameters: According to the steel target composition in Table 2 and the smelting temperature of about 1550°C, it is calculated according to formula ① and formula ③: smelting pressure p 1 is 0.41MPa, casting pressure p 2 is 0.90MPa. The smelting raw materials and their quality are as follows: industrial pure iron 17241.9g, metal chromium 3176.36g, metal molybdenum 210.04g, metal manganese 112.91g, industrial silicon 70.51g, graphite 66.06g. Among them, graphite and industrial silicon a...

Embodiment 2

[0069] The 20.0kg target steel grade 50Cr17MoVN0.2 was smelted by the dual process of pressurized induction and pressurized electroslag remelting, and its composition control range and smelting control target are shown in Table 5.

[0070] Table 5 50Cr17MoVN0.2 composition control range and control target / wt%

[0071]

[0072] Specific steps are as follows.

[0073] Pressure induction melting stage:

[0074] (1) Determination of ingredients and pressure parameters: According to the steel target composition in Table 5 and the smelting temperature of about 1550°C, it is calculated according to formula ① and formula ③: smelting pressure p1 is 0.09MPa, casting pressure p 2 is 0.6MPa. The smelting raw materials and their quality are as follows: industrial pure iron 16048.5g, metal chromium 3428.46g, metal molybdenum 200.04g, metal manganese 96.78g, metal vanadium 20.01g, industrial silicon 74.52g, graphite 109.71g. Among them, graphite and industrial silicon are added 5.8% an...

Embodiment 3

[0094] 20.5 kg of the target steel grade 18Cr14Mn3Mo0.9N was smelted by the dual process of pressurized induction and pressurized electroslag remelting, and its composition control range and smelting control target are shown in Table 8.

[0095] Table 8 18Cr14Mn3Mo0.9N composition control range and control target / wt%

[0096]

[0097]

[0098] Specific steps are as follows.

[0099] Pressure induction melting stage:

[0100] (1) Determination of ingredients and pressure parameters: According to the steel target composition in Table 2 and the smelting temperature of about 1550°C, it is calculated according to formula ① and formula ②: smelting pressure p 1 0.25MPa, casting pressure p 2 is 1.0MPa. The actual weight percentage of nitrogen content in smelting raw materials (wt) 1 The smelting raw materials and their quality are as follows: industrial pure iron 13684.8g, metal chromium 2746.09g, metal molybdenum 758.65g, metal manganese 3196g, chromium nitride 1116g, indus...

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Abstract

The invention belongs to the technical field of high-nitrogen steel smelting and particularly relates to a pressurizing induction and pressurizing electroslag remelting duplex high-nitrogen steel smelting method. The method is suitable for smelting high-nitrogen steel including smaller than or equal to 0.6% of C, smaller than or equal to 30% of Mn, 12%-30% of Cr, smaller than or equal to 1% of Si, 0%-4.5% of Mo, 0.1%-2% of N, 0%-4.5% of Ni, 0%-1% of V, smaller than or equal to 0.015% of S, smaller than or equal to 0.05% of P and the balance Fe. During smelting, a pressurizing induction furnace is used for smelting electrode base metal meeting the nitrogen content requirement according to steel grade components; an solid-state arcing method is used for arcing slagging under the nitrogen condition; and afterwards, the pressure of a smelting room and the pressure of cooling water are increased, and smelting is conducted with the voltage of 35 V to 40 V and the current of 2000 A to 3000 A. A technical guarantee is provided for developing high-nitrogen stainless steel which is low in sulfur content, few in nonmetallic inclusion, even and dense in structure and even in nitrogen distribution.

Description

technical field [0001] The invention belongs to the field of high-nitrogen steel smelting, and in particular relates to a method for double-linked smelting of high-nitrogen steel by pressurized induction and pressurized electroslag remelting. Background technique [0002] With the development of the steel industry and the advancement of technology, high-nitrogen stainless steel has become an important development direction in the field of stainless steel due to its advantages such as high strength, high toughness, and good corrosion resistance. As an important alloying element in steel, nitrogen can effectively improve the pitting corrosion resistance and stress corrosion resistance of stainless steel while ensuring interstitial solid solution strengthening. Therefore, high-nitrogen stainless steel has more excellent performance and wider application prospects than traditional stainless steel. [0003] The key technology of high nitrogen steel production is the addition and...

Claims

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Application Information

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IPC IPC(8): C21C5/52C22B9/18C22C38/22C22C38/02C22C38/04
CPCC21C5/5241C22B9/18C22C38/001C22C38/02C22C38/04C22C38/22Y02P10/25
Inventor 姜周华冯浩李花兵张树才韩宇刘福斌耿鑫罗毅
Owner NORTHEASTERN UNIV
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