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A production method of grain-oriented silicon steel with excellent bottom quality

A technology of grain-oriented silicon steel and a production method, which is applied in the production field of grain-oriented silicon steel with excellent bottom layer quality, can solve the problems of not considering the influence of the bottom layer quality, difficult to obtain effects, insufficient and other problems, so as to reduce or eliminate point-like exposed gold defects, The effect of eliminating spot-like gold defects

Active Publication Date: 2016-01-06
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

The Chinese patent (ZL200510020003.2) proposes to simultaneously control the atmosphere, temperature and oxygen content of the steel sheet during intermediate decarburization annealing and recovery annealing to obtain a good However, it does not consider the influence of the stage before the formation of the magnesium silicate bottom layer in high temperature annealing on the quality of the bottom layer, so it is not sufficient
Based on the above reasons, it is often difficult to obtain good results with these methods.

Method used

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  • A production method of grain-oriented silicon steel with excellent bottom quality
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  • A production method of grain-oriented silicon steel with excellent bottom quality

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The chemical composition and weight percentage are: 3.15%Si; 0.040%C; 0.22%Mn; 0.021%S; 0.021%Als; 0.0090%N; ; The rest is Fe and unavoidable impurities of continuous casting slab heated at 1180 ℃, hot-rolled into a hot-rolled coil thickness of 2.3mm.

[0047] After normalized annealing, the hot-rolled coils are cold-rolled once to a thickness of 0.30mm and 0.27mm, then undergo continuous decarburization annealing and nitriding annealing, and are coated with an annealing separator with magnesium oxide as the main component, and then undergo an oxidation annealing process. high-temperature annealing, and the rest of the process is carried out as usual. The results of its implementation are shown in Table 1.

[0048] Table 1 The decarburization and nitriding annealing primary cold rolling method result list that the present embodiment and comparative examples all adopt

[0049]

Embodiment 2

[0051] The composition and weight percentage of the continuous casting slab are: 3.20%Si; 0.056%C; 0.08%Mn; 0.011%S; 0.030%AIs; 0.0085%N; %Ti; the rest is Fe and unavoidable impurities. After the billet is heated at 1200°C, it is hot rolled into a hot coil with a thickness of 2.3 mm.

[0052] After normalized annealing, hot-rolled coils are cold-rolled to a thickness of 0.23mm and 0.27mm, and then oxidized and annealed after continuous decarburization annealing or / and in the cooling stage of decarburization and nitriding treatment, and coated with magnesium oxide as the main component The annealing spacer, or / and use pure nitrogen atmosphere for oxidation annealing treatment in the first heating stage of high temperature annealing, and the other stage processes of high temperature annealing are carried out as usual. The results obtained after stretching, leveling annealing and insulating coating are shown in Table 2.

[0053] Table 2 The decarburization and nitriding anneali...

Embodiment 3

[0056] Continuous casting slab composition (weight percent): 0.033-36%C, 3.16-3.20%Si, 0.18-0.19%Mn, 0.0040-0.0060%S, 0.014-0.16%Als, 0.0086-0.0093%N, 0.48-0.50% Cu, the rest is Fe and unavoidable impurities. After heating at 1250°C, the continuous casting slab is hot-rolled into a hot-rolled coil with a thickness of 2.3mm. After pickling and cold rolling to 0.65mm, after complete decarburization annealing in the middle, part of the steel coils are oxidized and annealed. The parameters of the oxidation annealing treatment scheme are shown in Table 3. Then all steel coils were cold-rolled to a finished thickness of 0.30mm, and then recovered and annealed at 580°C. Some coils were subjected to oxidation annealing during recovery annealing. The scheme is shown in Table 4. Afterwards, an annealing release agent with magnesium oxide as the main component is coated, and its moisture content is controlled at 2.0-3.0%. During the high-temperature annealing and heating stage, some coi...

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Abstract

The invention discloses a method for producing oriented silicon steel with excellent underlying quality. The method comprises the following steps: heating a continuous casting billet; hot rolling; rolling by adopting a one-time cold rolling method or a two-time cold rolling method comprising middle complete decarburization and annealing; coating an annealing parting agent, wherein the moisture content is 2-4%; annealing at a high temperature and carrying out oxidative annealing treatment in a pure nitrogen atmosphere or an atmosphere of nitrogen and argon which are mixed in any ratio before the first heating temperature reaches 800 DEG C; stretching, leveling, annealing and applying an insulating coating. According to the method, an outer oxidation layer is formed to limit the development of internal oxidation by controlling the oxygen content of a decarbonized and annealed steel plate and the moisture content in the parting agent, and carrying out oxidative annealing treatment at a high-temperature annealing stage and / or after decarburization and nitriding treatment or in the cooling stage in the decarburization and nitriding treatment, or / and after middle complete decarburization and annealing or in the cooling state of the middle complete decarburization and annealing, and / or in recovery annealing. Thus, the targets of reducing or removing dot gold defects of the oriented silicon steel and improving the underlying quality of the product are reached.

Description

technical field [0001] The invention relates to a production method of an oriented silicon steel, in particular to a production method of an oriented silicon steel with excellent bottom quality, specifically a production method of an oriented silicon steel which solves the dot-shaped exposed gold defect of the bottom layer of the oriented silicon steel. Background technique [0002] Before the 1980s, grain-oriented silicon steel products were mainly produced by two methods, namely, the general grain-oriented silicon steel produced by the high-temperature (above 1360°C) heating of the billet in the hot rolling process, and the two-time cold rolling method with intermediate annealing in the subsequent process ( CGO); and the production method of high magnetic induction oriented silicon steel (Hi-B) produced by the heating temperature of the slab above 1380 ° C, and the subsequent process adopts a cold rolling method under a large pressure. Due to the high heating temperature o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12
Inventor 毛炯辉王若平许光郭小龙钟光明徐慧英
Owner 武汉钢铁有限公司
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