A high-nitrogen steel consumable electrode for pressurized electroslag remelting and its preparation method

A technology of consumable electrode and pressurized slag, which is applied in the smelting field of high nitrogen steel, can solve the problems of oxygenation of molten steel, excessive Si content, uneven distribution of nitrogen content, etc., to improve composition distribution and increase outer diameter. Size, the effect of avoiding the oxygenation of molten steel

Active Publication Date: 2021-12-14
NORTHEASTERN UNIV LIAONING
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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

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  • A high-nitrogen steel consumable electrode for pressurized electroslag remelting and its preparation method
  • A high-nitrogen steel consumable electrode for pressurized electroslag remelting and its preparation method
  • A high-nitrogen steel consumable electrode for pressurized electroslag remelting and its preparation method

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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

One aspect of the present invention provides a consumable electrode for pressurized electroslag remelting high-nitrogen steel, which includes a base material of the consumable electrode and at least two cored tubes embedded in the base material of the consumable electrode; the cored tube includes The iron pipe and the nitride alloy filled in the iron pipe, the first end of the cored pipe is located at the end where the consumable electrode base material is inserted into the slag pool, and the second end of the cored tube is located at the end where the consumable electrode base material is away from the slag pool one end. It avoids the leakage of nitrided alloy in the process of electroslag remelting, and improves the composition distribution from the core to the edge of the remelted steel ingot. Another aspect of the present invention provides a method for preparing a consumable electrode for pressurized electroslag remelting high-nitrogen steel, which avoids the oxygenation of molten steel caused by welding, and has a simple preparation process and low cost.

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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Patent Type & Authority Patents(China)
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 LIAONING
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