Electrical steel and preparation method thereof

A technology of electrical steel and steel coils, applied in the field of iron and steel, can solve the problems of inability to promote low-hardness electrical steel products and high hardness, and achieve the effects of reducing iron loss, increasing magnetic induction intensity, and reducing hardness

Active Publication Date: 2021-10-01

湖南华菱涟钢特种新材料有限公司 +1

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Problems solved by technology

[0003] The existing bell annealing process mainly produces semi-process annealed electrical s...

Method used

In step S203, the oxide compound on the steel coil surface is crushed by a leveler, and then the multi-roller straightener at the leveler outlet is used to carry out multiple forward and reverse bending to the broken oxide, further Break the oxides, and finally use the brushing device to remove the oxides on the surface of the steel coil, which facilitates the rapid penetration of the acid solution and improves the pickling efficiency.

The contriver finds in many tests in production practice, adopts the steel coil of above-mentioned constituent element to carry out bell type annealing twice, with respect to a bell type annealing process, not only the structural strength of the obtained electrical steel has no influence, and The iron loss can be further reduced, the magnetic induction intensity of the electrical steel can be increased, and the hardness can be reduced, thereby lowering the requirement for the grinding tool of the machine tool for electrical steel processing.

[0029] In the related art at present, the general hardness of electrical steel produced by bell furnace is relatively high, and the magnetic induction intensity decreases. In order to improve the various performances of electrical steel and follow the design principles of ultra-low carbon and pure steel, the embodiment of this application provides an electrical steel, which improves the magnetic induction of electrical steel products by changing the mass percentage of each component element, and at the same time Reduce the hardness of electrical steel products.

[0056] Moreover, if the annealing temperature of the steel coil of the above constituent elements is too high and the time is too long, the magnetic induction of the electrical steel will be insufficient, and if the annealing temperature is too low and the time is too short, the iron loss of the electrical steel will be high. Therefore, the first annealing temp...

Abstract

The invention provides electrical steel and a preparation method thereof. The preparation method comprises the steps that hot rolling is conducted on a slab of the electrical steel to obtain a steel coil; the hot-rolled steel coil is subjected to acid pickling and cold rolling; the steel coil subjected to acid pickling and cold rolling is subjected to first-time cover annealing; the steel coil subjected to first-time cover annealing is flattened; the flattened steel coil is subjected to second-time cover annealing; and the steel coil obtained after second-time cover annealing is rewound, and the electrical steel is obtained. According to the preparation method of the electrical steel, two times of cover annealing are adopted, the main purpose of annealing is to eliminate work hardening generated in the acid pickling and cold rolling process, a steel plate is fully recrystallized, and the ideal iron loss and magnetic induction intensity are obtained. Compared with a one-time cover annealing process, two-time cover annealing is adopted, the iron loss can be further reduced, and the magnetic performance of the electrical steel is improved.

Technology Topic

Steel platesElectrical steel +4

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Experimental program(1)
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Example Embodiment

[0026] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description and drawings of the following examples are used to exemplify the principles of the present application, but cannot be used to limit the scope of the present application, i.e., the embodiments described herein.

[0027] In the description of the present application, it is to be described, unless otherwise stated, the meaning of "multiple" is more than two; the term "upper", "lower", "left", "right", "within", " The orientation or positional relationship of the instructions such as "" is only for convenience of description of the present application and simplified description, rather than indicating or implying that the device or element must have a specific orientation, and therefore cannot be understood as a subject Restriction of the application. Moreover, the terms "first", "second", "third", etc. are only used to describe purposes, and cannot be understood as instructions or implies relative importance.

[0028] The orientation in the following description is the direction shown in the figure, and is not limited to the specific structure of the present application. In the description of this application, it is also needed to be, unless otherwise expressly specified and defined, the term "installation", "connected", "connection" should be used to understand, for example, may be fixed connection, or may Disassemble the connection, or integrate; can be directly connected, or indirectly through the intermediate medium. The specific meanings of the above terms are understood in terms of the specific cases, in particular, those skilled in the art.

[0029] At present, in the relevant technologies, the universal hardness of electrical steel produced by cover furnace is high, and the magnetic induction strength is reduced. In order to improve the performance of electrical steel, it is following ultra-low carbon and steel pure design principles. The embodiment of the present application provides an electrician steel, and improves the magnetic induction strength of electrical steel products by changing the mass percentage of each component. Reduce the hardness of electrician steel products.

[0030] Specifically, the present application provides an electrical steel, including the following composition elements: C ≤ 0.005%, 0.35% ≤ div ≤ 0.65%, 0.20% ≤ Mn ≤ 0.45%, 0.03% ≤ p ≤ 0.06%, s ≤ 0.005 %, 0.20% ≤ al≤0.50%, 0.04% ≤ Sb ≤ 0.060%, N ≤ 0.0030%, Ti ≤ 0.003%, and iron elements and trace elements.

[0031] The principles of electrical steel in the present application examples are as follows:

[0032] Carbon C: Carbon constantly is detrimental to the magnetic transition, in addition to improving the coercive force and the energy consumption of the elimination and the energy consumption. However, the carbon content is too low during smelting, and the oxygen content in the steel is increased, which also reduces the magnetic property. The morphology of carbon exists in steel also has an effect on magnetism. The sheet-like large-scale trimmed carburgic in crystal boundary is small than the fine colicular carburgic in the crystal grains.

[0033] Silicon Si: The effect of silicon content is sensitive to magnetic properties, increasing the silicon content, and the resistivity increases and reduced eddy current loss. On the other hand, with an increase in the silicon content, the finished product is thick, and the hysteresis loss is lowered. Therefore, the silicon content is improved, and the iron loss is significantly reduced. At the same time, the magnetic field is also increased under the weak magnetic field, but the magnetic field is lowered, and the product is very crisp when the silicon content is more than 4.5%, and the number of bending is not required.

[0034] Manganese Mn: Manganese and sulfur form MNS, which prevents a hot brittle phenomenon caused by forming a low melting point along the crystal boundary, so that a certain amount of manganese is to improve hot rolling properties. Manganese enlarges the gamma phase region, the solid solution volume of MNS in the γ phase is low in the α phase, which can cause MNS to roughen the MNS, which is advantageous to grow up after the crystal grains. Mn / s ≥ 10, in addition to ensuring good thermal workability and enabling MNS, P increases low carbon electric steel hardness and improves the scrap. Manganese can improve hot rolled sheet tissue and texture, improve magnetic.

[0035] Phosphorus P: Phosphorus increase ρ, reduced γ area, so that the grains grow large, reduce iron loss. Phosphorus significantly improves hardness and improves the blades. Phosphorus impeding carbide precipitation and greater and reducing magnetic aging, but the amount of phosphorus is too high, especially in the case of low carbon, and the cold processing member is deteriorated, and the product is brittle.

[0036] Sulfur S: Sulfur is a harmful element. The amount of sulfur is increased, and the P15 is significantly increased, and 0.01% S, P15 is increased by 0.33 w / kg or by 0.01% S, P15 is increased by about 0.157 W / kg. Sulfur and manganese can form a fine to prevent the grains when the finished annealing is large. An important purpose of heating, hot rolling, and annealing process is to prevent the precipitation of fine MNS or roughen the MNS existing in the steel. Sulfur is also a major element that produces brittle.

[0037] Aluminum Al: Aluminum is similar to silicon, increasing the ρ value, shrinking the γ area and promoting the grain to grow, so the iron loss is lowered. Acid aluminum ALS is in the range of 0.005% to 0.014%, and P15 is significantly increased because the fine Aln is most likely to form a small Aln in this range, thereby hindering the crystal grains; the so-called acid aluminum is the aluminum amount and solid solution of the steel in the steel. Aluminum, that is, the total aluminum is reduced AI 2 O 3 The amount of aluminum remaining after China aluminum. When the amount of aluminum is 0.15%, the same effect is the same as that of the amount of silicon, and the coarse ALN is formed, improves the texture, reduces iron loss and decrease the anginaidity of magnetic anisotropy. And fixed nitrogen reduces magnetic time efficiency.

[0038]Nitrogen N: Nitrogen is a harmful element, which is easy to form a small AlN position to suppress grains growing. When N2> 0.0025%, P15 increased significantly, nitrogen is an element that produces magnetic aging. Since the solubility of nitrogen in α-Fe is about 10 times lower than that of the carbon solubility, nitrogen is more affected by the time. When the amount of nitrogen is higher than 0.012%, it is easy to produce a foaming phenomenon after annealing. An important purpose of heating, hot rolling, and annealing process is to prevent sedation, or rougigate AlN existing in steel.

[0039] SB: Surface segregation element, add a small amount of improvement of finished texture, improve magnetic sensation. When one or two total content exceeds 0.2%, the improvement effect is not significantly improved. Under a hood furnace annealing, SB can be sufficiently segregated in grain boundary, greatly improved the finished texture, and can achieve excellent magnetic sensation.

PUM

Property	Measurement	Unit
Iron loss	4.48 ~ 4.82	W/kg

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce iron loss
Increase magnetic induction

Electrical steel and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

PUM

Description & Claims & Application Information

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