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Full production process of low-temperature oriented silicon steel

A technology of oriented silicon steel and process, which is applied in the field of metallurgy, can solve the problems of low heating temperature, low hit rate of converter smelting grades, high heating temperature, etc., and achieve the effects of improving energy saving, reducing consumption, increasing service life, and reducing oxidation burning loss

Active Publication Date: 2012-01-25
JIANGYOU FENGWEI NEW MATERIAL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention aims to solve the technical problems of traditional oriented silicon steel, such as high heating temperature of hot-rolled slab, low life of heating furnace, waste of energy, narrow range of requirements for C and other chemical components of oriented silicon steel, low hit rate of converter smelting grades, etc., to provide a heating Low temperature oriented silicon steel production process with advantages such as low temperature, long service life of heating furnace, high hit rate of converter smelting, relatively simple production process (one-time decarburization annealing), low production cost, and better magnetic properties of the final product

Method used

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  • Full production process of low-temperature oriented silicon steel

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Effect test

Embodiment 1

[0037] The whole production process of low-temperature grain-oriented silicon steel of the present invention comprises the following steps:

[0038] a) The molten iron is pretreated to remove the S content in the molten iron to ≤0.005%;

[0039] b) Add molten iron with a weight ratio of 9:1 after pretreatment and high-quality scrap steel (scrap steel is steel that cannot be used and utilized) into the converter. Converter smelting adopts top-bottom composite blown converter, adopts raw materials such as active lime, light burnt dolomite, magnesium oxide balls, fluorite and iron oxide scale to make slag in batches and multiple times, and controls the slag alkalinity (R) ≥ 4.0, for dephosphorization. Make the end point composition and tapping temperature meet the following requirements: C<0.05%; Mn<0.015%; P<0.010%; S<0.010%; O<1000PPm;

[0040] c) During the tapping process, 8Kg×aluminum in the proportion of oxygen weight% in molten steel is added per ton of molten steel for ...

Embodiment 2

[0054] The whole production process of low-temperature grain-oriented silicon steel of the present invention comprises the following steps:

[0055] a) The molten iron should be pretreated first to remove the S content in the molten iron to ≤0.005%, and control the amount of harmful elements such as C, S, P, Ti, V, Nb, Zr in scrap steel, alloys and auxiliary raw materials, among which Fe- Si alloy C content ≤ 0.10 wt%, S content ≤ 0.050 wt%, P content ≤ 0.050 wt%, Cr content ≤ 0.10 wt%, Ti content ≤ 0.030 wt%, V content ≤ 0.030 wt%, Nb content ≤ 0.030 wt% %, Zr content≤0.020 wt%; C content≤0.10 wt%, S content≤0.020 wt%, P content≤0.10 wt% of Fe-Mn alloy; scrap steel C content≤0.20 wt%, S content≤0.020 wt% , P content≤0.020% by weight, Cr content≤0.10% by weight, Ti content≤0.050% by weight, V content≤0.050% by weight, Nb content≤0.050% by weight; S content of active lime≤0.030% by weight; S content of fluorite Content ≤ 0.10% by weight; S content of dolomite ≤ 0.020% by weigh...

Embodiment 3

[0071] The whole production process of low-temperature grain-oriented silicon steel of the present invention comprises the following steps:

[0072] a) Before smelting oriented silicon steel, the molten iron should be pretreated to reduce the S content in the molten iron to ≤0.005%, and control harmful elements such as C, S, P, Ti, V, Nb, Zr in scrap steel, alloys and auxiliary raw materials content;

[0073] b) After pretreatment, add molten iron with a weight ratio of 9:1 and high-quality scrap steel (scrap steel is steel that cannot be used and utilized) into the converter. Converter smelting adopts top-bottom composite blowing converter, adopts single slag method for one-time blowing; in order to improve metallurgical effect, adopts constant pressure variable gun position oxygen supply operation; adopts batches, multiple additions of active lime, lightly burned dolomite, magnesium oxide balls , fluorite, iron oxide scale and other auxiliary materials for slagging, and con...

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Abstract

The invention provides a full production process of a low-temperature oriented silicon steel, relates to the technical field of metallurgy, and aims at solving the technical problems of high slab heating temperature, short service life of a heating furnace, energy waste, low converter smelting designation hit rate of the oriented silicon steel due to narrow range of requirements on C and other chemical element contents, and the like of traditional cold-rolled oriented silicon steel. The full production process of the low-temperature oriented silicon steel comprises the following steps: molteniron pre-treatment, converter treatment, RH (Ruhrstahl-Heraeus) vacuum treatment, slab continuous casting, hot charging and hot delivery, slab heating, hot rolling, primary cold rolling, primary decarbonization and annealing, secondary cold rolling, low-temperature recovery annealing and magnesium oxide coating, high-temperature cover furnace annealing, stretching and insulating layer coating, aswell as slitting, packaging and storing to finally produce the low-temperature oriented silicon steel.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a whole process for producing low-temperature cold-rolled oriented silicon steel. [0002] Background technique [0003] Grain-oriented silicon steel is the main raw material for making transformers, transformers and other power equipment. The loss of electric energy in the power system is very large, and the loss of the power transformer accounts for about 20-25% of the loss of the power system. The loss of small and medium transformers accounts for 40-50% of the transformer losses in power systems. Improving the magnetic induction of low-temperature oriented silicon steel and reducing the iron loss can not only reduce the loss of the transformer and save energy, but also reduce the cross-section of the iron core, reduce the volume and weight of the transformer, and greatly reduce the manufacturing cost of the transformer. [0004] Oriented silicon steel has the advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C22C38/16C22C38/02
Inventor 刘鹏程
Owner JIANGYOU FENGWEI NEW MATERIAL
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