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Method for producing aluminum-free steel grade of cold milling non-oriented silicon steel

A technology of oriented silicon steel, aluminum-free steel, applied in metal rolling, program control in sequence/logic controller, electrical program control, etc., can solve the problem of incomplete deoxidization, resistance, fluctuation of rolling stability, and increase of inclusions and other problems, to achieve great economic and social benefits, reduce quality and cost losses, and achieve excellent electromagnetic performance.

Active Publication Date: 2011-03-30
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the smelting process, since the molten steel does not contain aluminum, the traditional Al deoxidation method cannot be used. Generally, the silicon deoxidation method is used, which will lead to incomplete deoxidation and increased inclusions, so the auxiliary material refractory (alloying) brings aluminum and smelted nitrogen. content and the content of residual elements that are easy to form nitrides must be strictly controlled; the phase transition interval of non-oriented electrical steel aluminum-free steel grades increases with the increase in grade (increase in silicon content), and in the production of conventional hot rolling processes, with temperature Small fluctuations are controlled, the resistance after deformation and rolling stability fluctuate sharply, the controllability of conventional process production is reduced, and accidents such as "steel jamming" and "stacking of steel" often occur in production, which not only makes it difficult to ensure the quality pass rate of finished cold-rolled electrical steel , increased production costs and accident handling costs; and seriously affected the stability of production, resulting in a substantial reduction in yield and output

Method used

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  • Method for producing aluminum-free steel grade of cold milling non-oriented silicon steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The chemical composition and weight percentage of steel are:

[0019] C 0.0015%, Si 0.573%, Mn 0.345%, P 0.0386%, S 0.0048%, Als 0.0010%, N 0.0018%, Ti 0.001%, Nb, V ≤ 0.0020%, respectively. The rest are inevitable impurities.

[0020] Converter smelting, strictly control the residual aluminum brought in during the alloying process of deoxidized aluminum, auxiliary materials and refractory materials. It adopts RH vacuum refining treatment, and the refining and deoxidation process adopts silicon deoxidation. The molten steel is cast into continuous casting billets by continuous casting.

[0021] For hot rolling, low temperature heating is adopted, and the heating temperature of the billet is 1080°C; for finishing rolling, temperature-controlled rolling is performed, the rolling temperature is 1030°C, the final rolling temperature is 860°C, and the coiling temperature is 693°C.

[0022] Cold rolling, using continuous rolling method to roll into finished strip with thic...

Embodiment 2

[0025] The chemical composition and weight percentage of steel are:

[0026] C 0.0020%, Si 0.85%, Mn 0.44%, P 0.037%, S 0.0052%, Als 0.0005%, N 0.0010%, Ti 0.0009%, Nb, V ≤ 0.0020%, respectively. The rest are inevitable impurities.

[0027] Converter smelting and RH vacuum refining treatment, refining and deoxidation process using silicon deoxidation and cast into continuous casting billets.

[0028] The heating temperature of the hot-rolled billet is 1150°C; the opening temperature of the finishing rolling is 1030°C, the final rolling temperature is 890°C, and the coiling temperature is 697°C.

[0029] Cold rolling, using continuous rolling method to roll into finished strip with thickness of 0.5mm at one time.

[0030] Annealing and cold rolling use continuous annealing furnace wet hydrogen decarburization annealing, coating insulation layer and other processes to make aluminum-free cold-rolled non-oriented silicon steel.

Embodiment 3

[0032] The chemical composition and weight percentage of steel are:

[0033] C 0.0010%, Si 1.15%, Mn 0.62%, P 0.0274%, S 0.0037%, Als 0.0008%, N 0.0016%, Ti 0.0019%, Nb, V ≤ 0.0020%, respectively. The rest are inevitable impurities.

[0034] Converter smelting and RH vacuum refining treatment, refining and deoxidation process using silicon deoxidation and cast into continuous casting billets.

[0035] The heating temperature of the hot-rolled billet is 1100°C; the opening temperature of the finishing rolling is 1010°C, the final rolling temperature is 870°C, and the coiling temperature is 690°C.

[0036] Cold rolling, using continuous rolling method to roll into finished strip with thickness of 0.5mm at one time.

[0037] Annealing and cold rolling use continuous annealing furnace wet hydrogen decarburization annealing, coating insulation layer and other processes to make aluminum-free cold-rolled non-oriented silicon steel.

[0038] The electromagnetic properties of the al...

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Abstract

The invention relates to a method for producing aluminum-free steel grade of cold milling non-oriented silicon steel, which comprises the following steps of: controlling the quantity of Als to be not more than 0.0010 percent and the content of residual elements easily forming nitrides; adopting low-temperature heating and controlled-temperature milling for hot milling; adopting primary cold method milling or secondary cold method milling with the middle annealing for cold milling; and carrying out the integrated control measures such as wet hydrogen decarburization, recrystallization temperature annealing and the like. Thereby, the mass production of efficient aluminum-free cold milling non-oriented silicon steel can be realized with low production cost under the condition of the traditional equipment, the electromagnetic performance of the efficient aluminum-free cold milling non-oriented silicon steel is superior to the cold milling non-oriented silicon steel produced by the same-trademark conventional process, the iron loss is averagely reduced by about 0.4W / kg, the magnetic strength is averagely improved by 0.2T, and the method not only meets the market requirements, but also has obvious economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of steel smelting and processing, and particularly relates to a method for producing cold-rolled non-oriented silicon steel and aluminum-free steel grades by controlling smelting components and rolling processes. Background technique [0002] With the rapid development of the refrigeration compressor industry, it is not only required that the cold-rolled non-oriented silicon steel products have high magnetic induction and low iron loss, but also that the residual material can be recovered for casing casting after the product is punched, and there are no bubbles in the cast after casting. produce. Therefore, new subjects and higher requirements are put forward for the development and production of aluminum-free steel grades with low cost, high magnetic induction and good punching performance. [0003] There are many difficulties in the production process of cold-rolled non-oriented silicon steel and aluminum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/00G05B19/04
Inventor 高振宇陈春梅李文权金文旭张智义罗理张仁波李亚东
Owner ANGANG STEEL CO LTD
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