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Method for controlling content of nitrogen in oriented silicon steel

A technology of oriented silicon steel and control method, which is applied to the improvement of process efficiency, electric furnace, furnace, etc., can solve the problems of long process, lack of multi-batch supplementation, low nitrogen content, etc.

Inactive Publication Date: 2012-04-11
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, vacuum smelting oriented silicon steel has its obvious steel characteristics. For example, the amount of silicon raw material added to oriented silicon steel is large, the required purity of molten steel is high, the nitrogen content in the controlled steel is relatively low (generally ≤110ppm), and the fluctuation range of nitrogen Narrow (within 10-20ppm), and in the case of nitrogen filling, it is also necessary to consider the narrow range control of other elements (such as manganese) in grain-oriented silicon steel, which limits the selection of nitrided alloy raw materials and the selection of nitrogen filling pressure, etc.
In particular, vacuum induction furnaces usually lack sampling equipment similar to those on large industrial production lines, lack of online element rapid analysis system in front of the furnace, and lack of effective control methods such as the function of accurately adding alloy materials in multiple batches in the vacuum hopper , and the vacuum induction furnace itself still has the characteristics of small furnace volume, small slag-gold reaction interface, and a small amount of alloy addition may cause large composition fluctuations. not easy
However, due to the large amount of molten steel for smelting a furnace of grain-oriented silicon steel in large industrial production lines (generally 80-300 tons / furnace), the process for conducting industrial experiments on grain-oriented silicon steel is long and complicated. Moreover, if the molten steel composition of grain-oriented silicon steel is controlled If it is not allowed, the production cost will be high, so it is very necessary to conduct experimental research on qualified grain-oriented silicon steel ingots smelted by vacuum induction

Method used

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  • Method for controlling content of nitrogen in oriented silicon steel
  • Method for controlling content of nitrogen in oriented silicon steel
  • Method for controlling content of nitrogen in oriented silicon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The equipment adopts a 50kg vacuum induction furnace with a power supply of 160KW, a rated voltage of 380V, a maximum temperature of 1700°C, and a frequency of 2500Hz. Furnace load 40kg, smelting 1 furnace of oriented silicon steel QX1 ([N]≤0.005wt%), the composition control range and target requirements are shown in Table 1, and the raw material ingredients are shown in Table 2 (excluding carbon and aluminum for deoxidation) . Among them, the chemical composition of pure iron is Mn: 0.042wt%, N: 0.037wt%, P: 0.0086wt%, S: 0.035wt%, Cu: 0.034wt%, others are Fe and trace impurities; ferrosilicon nitride The nitrogen content is 26wt%.

[0035] Table 1 The composition control range and control target of grain-oriented silicon steel QX1

[0036]

[0037] Table 2 Raw material ingredients for smelting grain-oriented silicon steel QX1

[0038] pure iron

the carbon

Silicon metal

manganese metal

Ferrous sulfide

Ferrosilicon Nitride

copper ...

Embodiment 2

[0053] The equipment adopts a 50kg vacuum induction furnace with a power supply of 160KW, a rated voltage of 380V, a maximum temperature of 1700°C, and a frequency of 2500Hz. The furnace load is 40kg, and one furnace of oriented silicon steel QX2 ([N]=0.008wt%-0.009wt%) is smelted. The composition control range and target requirements are shown in Table 5, and the raw material ingredients are shown in Table 6 (not included in the deoxidation use). carbon and aluminum).

[0054] Table 5 Component control range and control target of grain-oriented silicon steel QX2

[0055]

[0056] Table 6 List of raw materials for smelting grain-oriented silicon steel QX2

[0057]

[0058] Specific steps are as follows:

[0059] (1) Pure iron and carbon 12g are put into crucible, and aluminum, metal silicon, carbon, ferrous sulfide, tin, ferrosilicon nitride, metal manganese are put into vacuum hopper according to the order of alloy feeding;

[0060] (2) Vacuumize the furnace until th...

Embodiment 3

[0068] The equipment adopts a 50kg vacuum induction furnace with a power supply of 160KW, a rated voltage of 380V, a maximum temperature of 1700°C, and a frequency of 2500Hz. Furnace load 40kg, smelting 1 furnace of oriented silicon steel QX3 ([N]=0.006wt%-0.008wt%), its composition control range and target requirements are shown in Table 8, raw material ingredients are shown in Table 9 (not included in deoxidation) carbon and aluminum).

[0069] Table 8 The composition control range and control target of grain-oriented silicon steel QX3

[0070]

[0071] Table 9 Raw material ingredients for smelting grain-oriented silicon steel QX3

[0072]

[0073] According to the target composition of the oriented silicon steel QX3, at 1600°C, according to the nitrogen filling pressure calculation formula, the nitrogen filling pressure is 5.0KPa. Within the required composition range, the chemical composition of the finished steel QX3 is shown in Table 10.

[0074] Specific steps ...

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Abstract

The invention discloses a method for controlling the content of nitrogen in oriented silicon steel. The method comprises the following steps: placing pure iron used as the raw material and carbon in a crucible, placing accessories in a vacuum hopper according to the alloy raw material proportion and the charging sequence, wherein the alloy raw material proportion is calculated according to the content of each element in the oriented silicon steel; heating the furnace charge to melt, and refining the molten steel; adding aluminum to deoxidize after refinement, then adding metallic silicon or an alloy containing the nonvolatile elements of the oriented silicon steel to perform alloying; deciding whether to inject argon or nitrogen according to the content of nitrogen in the oriented siliconsteel; adding nitrogen-containing ferromanganese to adjust nitrogen under the protective atmosphere, adding other alloy raw materials to meet the target contents; and performing the vacuum charged pouring of molten steel at a proper molten steel temperature. Therefore, the narrow component range control of nitrogen element in the oriented silicon steel can be realized by adopting the method for controlling the content of nitrogen in the oriented silicon steel.

Description

technical field [0001] The invention relates to a method for controlling the nitrogen content in grain-oriented silicon steel, more specifically, a method for controlling the nitrogen content in grain-oriented silicon steel within a narrow composition range under vacuum induction melting conditions. Background technique [0002] Oriented silicon steel is a functional metal material widely used in electric power, electromechanical, home appliance manufacturing industries and military industries. It is difficult to produce and has strict quality requirements. It is called "steel art" in the industry. Grain-oriented silicon steel has extremely strict requirements on chemical composition, and the specified composition range is very narrow, and a slight fluctuation in composition will have a great impact on performance. In the production process of grain-oriented silicon steel, in order to obtain a single Goss texture through secondary recrystallization, the primary grain growth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C22C33/04
CPCY02P10/20
Inventor 刘和平向睿赵宇
Owner CENT IRON & STEEL RES INST
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