Middle code non-oriented electrical steel with fine surface and manufacturing method thereof

A technology of grain-oriented electrical steel and surface state, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve the problems of increasing manufacturing costs, increasing equipment investment, etc., to achieve reduced investment, good surface condition, magnetic and mechanical properties excellent effect

Active Publication Date: 2008-10-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method will increase the investment

Method used

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  • Middle code non-oriented electrical steel with fine surface and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] First, according to the chemical composition carbon: 0.0073%, silicon: 1.96%, manganese: 0.25%, sulfur: 0.0050%, aluminum: 0.32%, nitrogen: 0.0025%, phosphorus: 0.020%, the rest is Fe and unavoidable impurities, smelting out steel, which is then continuously cast into slabs.

[0041] In the hot rolling heating furnace, the slab is heated at a temperature of 1180°C. It is required that the time before the rough rolling slab enters the finish rolling is controlled within the range of 45s, the F1 reduction of the finish rolling is 50%, and the finish rolling temperature is 880°C , followed by coiling at a temperature of 650°C. The 2.6mm thick hot-rolled steel strip is cold-rolled to 0.5mm thick in the pickling and continuous rolling unit, and then the hardened strip is rolled in the electric steel continuous annealing and coating unit under the condition of 840℃×3min and a dew point of 50℃ in a wet atmosphere. Decarburization annealing is carried out, and then recrystalli...

Embodiment 2

[0043] First, according to the chemical composition, it contains carbon: 0.0123%, silicon: 2.05%, manganese: 0.20%, sulfur: 0.0045%, aluminum: 0.25%, nitrogen: 0.0020%, phosphorus: 0.025%, and the rest is Fe and unavoidable impurities. The steel is tapped and then cast into slabs.

[0044]In the hot rolling heating furnace, the slab is heated at a temperature of 1140°C. It is required that the time before the rough rolling slab enters the finish rolling is controlled within the range of 64s, the F1 reduction of the finish rolling is 65%, and the finish rolling temperature is 860°C , followed by coiling at a temperature of 600°C. The 2.6mm thick hot strip is cold rolled to 0.5mm thick in the pickling tandem mill, and then the hardened strip is rolled in the electric steel continuous annealing and coating unit under the wet atmosphere conditions of 850℃×4min and dew point 50℃ Decarburization annealing, then recrystallization annealing under the condition of 900°C×8sec, and fina...

Embodiment 3

[0046] First, according to the chemical composition, it contains carbon: 0.0097%, silicon: 1.65%, manganese: 0.27%, sulfur: 0.0040%, aluminum: 0.35%, nitrogen: 0.0025%, phosphorus: 0.020%, and the rest is Fe and unavoidable impurities. The steel is tapped and then cast into slabs.

[0047] In the hot rolling heating furnace, the slab is heated at a temperature of 1120°C. It is required that the time before the rough rolling slab enters the finish rolling is controlled within the range of 55s, the F1 reduction of the finish rolling is 55%, and the finish rolling temperature is 860°C , followed by coiling at a temperature of 580°C. The 2.6mm thick hot rolled steel strip is cold rolled to 0.5mm thick in the pickling tandem rolling mill, and then the hard rolled steel strip is carried out in the wet atmosphere condition of 840℃×3min and dew point 50℃ in the electrical steel continuous annealing and coating unit. Decarburization annealing, then recrystallization annealing under th...

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Abstract

The invention discloses a middle grade non-orientation electric steel with good surface state and a manufacturing method thereof, chemical ingredients of the steel comprises: C 0.007-0.013%, Si 1.6-2.1%, Mn<=0.5%, S<=0.005%, P 0.02-0.1%, Al 0.2-0.4%, N<= 0.005%, the rests are Fe and unavoidable impurities. The manufacturing method comprises: continuously casting and heating slab in a hot-rolling heating furnace at the temperature lower than 1200 DEG C, roughly rolling the slab to the thickness of 30 to 50 mm, the time between the rough rolling and the refined rolling is controlled within the range from 40 to 70 seconds, controlling the refined rolling F1 percent reduction as 50 to 70%, and then performing pickling and cool-rolling, annealing, coating the insulating coating. The steel manufactured according to the invention has good surface state and does not form ridge flaws, the magnetic and mechanical performances are outstanding, and the investment to the apparatus as well as the manufacturing cost are reduced.

Description

technical field [0001] The invention relates to non-oriented electrical steel technology, in particular to medium-grade non-oriented electrical steel with good surface condition and no corrugated defects and its manufacturing process. Background technique [0002] Non-oriented electrical steel sheets are mainly used as materials for motors and small EI iron cores. When electrical steelmaking is produced by continuous casting, if the chemical composition Si>1.65%, C<0.006%, there will be no α→γ phase transformation in the hot rolling process, and the coarse (100) formed in the continuous casting slab Due to the slow dynamic recovery and recrystallization during the hot rolling process, the columnar grains cannot be completely broken. Coarse and elongated deformed grains are formed near the thickness center of the hot rolled sheet, mainly {100}<011> fibrous structure. This structure is difficult to recrystallize during cold rolling and annealing, so that a kind of...

Claims

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Application Information

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IPC IPC(8): C22C38/06B22D11/16B21B37/00C21D8/12C21D11/00
Inventor 陈晓储双杰李国保余伟陈卓雷
Owner BAOSHAN IRON & STEEL CO LTD
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