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Cu-containing non-oriented silicon steel and production method thereof

A production method and technology for oriented silicon steel, applied in the production field of non-oriented silicon steel, can solve the problems of aggravating iron oxide scale, surface iron oxide scale, inheritance, etc., and achieve the effect of reducing energy consumption, ensuring the quality of the board surface and high yield strength

Pending Publication Date: 2021-11-02
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the existing Cu-containing high-strength cold-rolled non-oriented silicon steel and its manufacturing method, when the Si content is high and the Cu content is above 1%, it often faces serious problems of surface oxide scale, especially after high-temperature normalization treatment, the scale Aggravation, pickling is more difficult, and the pressing of iron scale will seriously damage the surface quality of hot-rolled sheets and may be inherited to cold-rolled sheets, resulting in defects such as inclusions on the surface of finished steel sheets. In addition, excessive Si and Cu will lead to a sharp drop in magnetic induction , and the addition of Ni will lead to a significant increase in alloy cost

Method used

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  • Cu-containing non-oriented silicon steel and production method thereof
  • Cu-containing non-oriented silicon steel and production method thereof
  • Cu-containing non-oriented silicon steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Converter steelmaking, continuous casting into slabs after vacuum treatment, the main chemical composition of the slabs is shown in Table 1, the rest is Fe, Als and other impurities, the slabs are heated and subjected to hot rolling and rough rolling, and the intermediate slabs are forced to be coiled by a hot coil machine , after uncoiling, the intermediate billet enters the insulation box, after exiting the insulation box, it is descaled under high pressure, finish rolling to 2.1mm, laminar flow cooling, coiling, cold rolling to 0.35mm after pickling, and finally annealing and coating treatment, the finished product is in N 2 The aging heat treatment was carried out at 500°C×1h under a protective atmosphere. The performance after aging and the quality of hot-rolled pickling are shown in Table 2.

[0057] Table 1 Slab Chemical Composition (wt,%)

[0058]

[0059] Table 2 process performance and pickling quality

[0060]

[0061]

Embodiment 2

[0063] The slab A of Example 1 is used for heating, and after heating, hot rolling and rough rolling are carried out. Part of the intermediate billet is forced to be coiled by a hot coil machine, and part of the intermediate billet enters the heat preservation box, followed by high-pressure descaling, and finish rolling to 2.1mm. Laminar cooling, coiling, cold rolling to 0.35mm after pickling, annealing and coating treatment, the final product is in N 2 480°C × 1.5h aging heat treatment was carried out under protective atmosphere. The performance after aging and the quality of hot-rolled pickling are shown in Table 3.

[0064] Table 3 process and finished product performance

[0065]

[0066]

[0067] In Table 3, the invention range of the temperature in the incubator is 960°C to 1060°C, preferably 990°C to 1030°C, and the temperature in the incubator in Invention Examples 4 to 6 adopts the preferred temperature, which takes into account the quality of hot-rolled picklin...

Embodiment 3

[0069] The slab F of Example 1 is used for heating, after heating, hot rolling and rough rolling are carried out, part of the intermediate billet is forced to be coiled by a hot coiler, and part of the intermediate billet enters the heat preservation box, followed by high-pressure descaling, and finish rolling to 2.2 mm. Laminar cooling, coiling, cold rolling to 0.35mm after pickling, and finally annealing and coating treatment, the final properties and surface conditions of the finished product are shown in Table 4.

[0070] Table 4 process and finished product performance

[0071]

[0072]

[0073] In Table 4, the invention range of temperature into the incubator is 946°C to 1046°C, preferably 976°C to 1016°C, and the temperature of the incubator in Invention Examples 4 to 5 adopts the preferred temperature, which takes into account the quality of hot-rolled pickling and the magnetic properties of the finished product; In Comparative Examples 1 and 2, the quality of ho...

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Abstract

The invention relates to a production method of Cu-containing non-oriented silicon steel. The production method comprises the following steps that converter steelmaking is performed, and after vacuum treatment, continuous casting is performed to form a blank; the casting blank comprises the chemical components, greater than or equal to 1.0 and smaller than or equal to 3.0 of Si / Cu, greater than or equal to 3.0 and smaller than or equal to 5.5% of Si+Cu, smaller than or equal to 0.0015% of S, greater than or equal to 3000 of (Mn+Cu) / S, and the balance of Fe, Als, P and inevitable impurity elements; rough rolling is carried out on the casting blank; a roughly rolled intermediate billet is forcibly coiled by a hot coiling machine, the uncoiled intermediate billet enters a heat preservation box, and the cooling speed in the heat preservation box is controlled to be smaller than or equal to 5 DEG C / s; the temperature T1 of the intermediate billet entering the heat preservation box meets the condition that T1 is larger than or equal to 1000-(Si+Cu)*103 and smaller than or equal to 1100-(Si+Cu)*103; high-pressure descaling, finish rolling, laminar cooling and coiling are performed; continuous pickling is performed; cold rolling is performed to a target thickness, and a finished product is annealed and coated; and a finished coil is subjected to aging treatment. The finished coil has low medium-high frequency iron loss, high magnetic induction and high yield strength.

Description

technical field [0001] The invention relates to the technical field of production of non-oriented silicon steel, in particular to a Cu-containing non-oriented silicon steel and a production method thereof. Background technique [0002] With the development of electric drive technology, the rotor is developing towards high speed, and the non-oriented silicon steel plate for the rotor is required to have high yield strength. Therefore, in order to meet the development needs of the new energy automobile industry, it is necessary to develop non-oriented silicon steel with low iron loss, high magnetic induction, and high strength. In cold-rolled steel sheets, methods such as solid solution strengthening, precipitation strengthening, phase transformation strengthening, fine-grain strengthening, and dislocation strengthening are generally used to increase the strength. It should also be reduced as much as possible, and the higher starting torque requires the material to have a hig...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C38/02C22C38/04C21D8/12
CPCC22C38/16C22C38/02C22C38/04C21D8/1222C21D8/1238C21D8/1244
Inventor 石文敏杨光李准陈圣林吕黎马金龙费东东
Owner 武汉钢铁有限公司
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