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High-nitrogen steel consumable electrode for pressurized electroslag remelting and preparation method of high-nitrogen steel consumable electrode

A technology of consumable electrode and pressurized electroslag, which is applied in the field of high-nitrogen steel smelting, can solve problems such as uneven distribution of nitrogen content, oxygenation of molten steel, and excessive Si content, so as to avoid oxygenation of molten steel and improve Component distribution, effect of increasing outer diameter size

Active Publication Date: 2021-07-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

which uses Si 3 N 4 Nitrogen alloying can easily cause the Si content in the steel to exceed the standard. Melting under high pressure will also cause the slag to boil due to the formation of nitrogen when nitrogen is added to the slag, which disturbs the smelting process and makes the distribution of nitrogen content in the remelted steel ingot uneven. , for which it is necessary to remelt again to improve the uniformity of nitrogen
Another method of adding additives is to weld multiple alloy tubes around the base metal of the consumable electrode. The alloy tubes are filled with alloy additives and deoxidizers. This method is likely to cause uneven composition from the center to the edge of the remelted steel ingot, and the welding Oxygenation of molten steel and other component pollution caused by welding; at the same time, the preparation process of consumable electrodes is complicated and the workload is large, and the increase in electrode diameter also reduces the gap between the electrode and the crystallizer, which affects safe operation and is difficult to achieve Industrial production

Method used

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  • High-nitrogen steel consumable electrode for pressurized electroslag remelting and preparation method of high-nitrogen steel consumable electrode
  • High-nitrogen steel consumable electrode for pressurized electroslag remelting and preparation method of high-nitrogen steel consumable electrode
  • High-nitrogen steel consumable electrode for pressurized electroslag remelting and preparation method of high-nitrogen steel consumable electrode

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preparation example Construction

[0047] The embodiment of the present invention also proposes a method for preparing a consumable electrode for pressurized electroslag remelting high nitrogen steel, comprising the following steps:

[0048] Step S1. Determine the nitrogen content of the consumable electrode base material according to the chemical composition of the designed steel type, and determine the core cladding according to the target weight of the designed steel type, the nitrogen content of the designed steel type, and the nitrogen content of the consumable electrode base material The amount of nitrided alloy in the tube and prepare the nitrided alloy.

[0049] Specifically, according to the chemical composition of the designed steel, determine the nitrogen content of the consumable electrode base material, including: according to the chemical composition of the designed steel, determine the limit nitrogen content of the designed steel under normal pressure, according to the designed steel Determine th...

Embodiment 1

[0066] Prepare 250kg of design steel grade 18Cr20Mn2Ni1Mo0.3Si1N, its composition (wt.%) is shown in Table 1.

[0067] Table 1 Composition of design steel grade 18Cr20Mn2Ni1Mo0.3Si1N

[0068] Element type C mn Cr Si Ni Mo N P S Fe Component range ≤0.05 18～22 16.5～19.8 ≤0.3 ≤2.1 ≤1 0.95～1.05 ≤0.03 ≤0.01 margin target ingredient 0.05 20 18 0.3 2 1 1 0.03 0.01 margin

[0069] Step S1, according to the chemical composition of the designed steel grade, determine the limit nitrogen content [%N]=0.988 of the designed steel grade 18Cr20Mn2Ni1Mo0.3Si1N at 1520°C and 0.07MPa nitrogen partial pressure, according to the limit of the designed steel grade under this pressure Nitrogen content and empirical correction value, it is determined that the nitrogen content of the consumable electrode base material is 0.988%×0.7=0.642%. According to the target weight of the designed steel grade, the nitrogen content of the designed steel ...

Embodiment 2

[0095] 200kg of design steel grade 21Cr23Mn2.5Ni1Mo0.5Si1.6N was prepared, and its composition (wt.%) is shown in Table 6.

[0096] Table 6 Composition of Design Steel Type 21Cr23Mn2.5Ni1Mo0.5Si1.6N

[0097]

[0098]

[0099] Step S1, according to the chemical composition of the designed steel, determine the limit nitrogen content of the designed steel 21Cr23Mn2.5Ni1Mo0.5Si1.6N at 1510°C and 0.07MPa nitrogen partial pressure [%N]=1.635, according to the designed steel here Based on the limit nitrogen content under pressure and the empirical correction value, it is determined that the nitrogen content of the base material of the consumable electrode is 1.635%×0.7=1.063%. According to the target weight of the designed steel grade, the nitrogen content of the designed steel grade, the nitrogen content of the consumable electrode base metal and the recovery rate of nitrogen in the chromium nitride, the nitrogen content provided by the nitrided alloy is (1.6-1.063) / 0.80×100...

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Abstract

The invention provides a high-nitrogen steel consumable electrode for pressurized electroslag remelting on one hand. The consumable electrode comprises a consumable electrode base material and at least two core-spun tubes embedded into the consumable electrode base material. Each core-spun tube comprises an iron tube and nitralloy arranged in the iron tube in a filling manner, wherein the first end of the core-spun tube is positioned at the end, inserted into a slag bath, of the consumable electrode base material, and the second end of the core-spun tube is positioned at the end, far away from the slag bath, of the consumable electrode base material. The leakage of the nitralloy in the electroslag remelting process is avoided, and the component distribution from the core part to the edge part of a remelted steel ingot is improved. The invention provides a preparation method of the high-nitrogen steel consumable electrode. Oxygen increasing of molten steel due to welding is avoided, in addition, the preparation process is simple, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of high-nitrogen steel smelting, in particular to a high-nitrogen steel consumable electrode for pressurized electroslag remelting and a preparation method thereof. Background technique [0002] High-nitrogen steel refers to the steel whose actual nitrogen content in the material exceeds the limit value that can be achieved by the material prepared under normal pressure. As an interstitial atomic element in steel, nitrogen can improve various properties of steel through synergistic effects with other alloying elements (manganese, chromium, molybdenum, vanadium, niobium and titanium, etc.), for example, nitrogen can effectively improve the strength and hardness of steel And corrosion resistance, especially to improve the grain boundary corrosion resistance of steel. Because high-nitrogen steel has excellent performance and considerable application prospects, at present, the distribution of nitrogen content i...

Claims

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Application Information

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IPC IPC(8): C22B9/187C21C7/00C21C7/10B22D19/00
CPCC22B9/18C21C7/00C21C7/10B22D19/00C22C38/001Y02P10/25
Inventor 姜周华康从鹏刘福斌李花兵耿鑫冯浩
Owner NORTHEASTERN UNIV
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