Non-oriented silicon steel and production method thereof

A production method and technology of oriented silicon steel, applied in the field of metal material processing, can solve the problems of reduced production rolling passes, reduced production difficulty, and high production difficulty, and achieve reduction in reduction, low difficulty, and large grain size Effect

Pending Publication Date: 2019-11-19
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a non-oriented silicon steel for the problems of poor magnetic performance, high iron loss, low magnetic induction, easy occurrence of hot-rolled edge cracks, cold-rolled edge cracks, difficult production, long production process and complicated process. Silicon steel and its production method, by reducing the thickness of the cast slab and the thickness of the hot-rolled strip steel, reduce the hot-rolling reduction and cold-rolling reduction, so that the production rolling passes are greatly reduced, the production difficulty is greatly reduced, and the production capacity is improved. Production efficiency and yield; by applying a small amount of deformation to the hot-rolled strip, and at the same time promoting the uniformity and coarsening of grains through normalizing annealing at a lower temperature, the final annealed non-oriented silicon steel has lower iron loss and higher Magnetic induction, with high comprehensive magnetic properties

Method used

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  • Non-oriented silicon steel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Smelting

[0050]The chemical composition of molten steel is: C: 0.02wt%, Si: 3.50wt%, Mn: 0.20wt%, Al: 0.002wt%, Sn: 0.10wt%, Sb: 0.04wt%, N: 0.002wt%, S: 0.002 wt%, O: 0.003wt%, Cu: 0.30wt%, Cr: 0.60wt%, Ni: 0.07wt%, V: 0.03wt%, Nb: 0.01wt%, Ti: 0.02wt%, P: 0.10wt% , and the rest are Fe and unavoidable impurities.

[0051] 2) Thin strip continuous casting

[0052] The molten steel qualified for smelting is continuously cast into a cast strip with a thickness of 2.5mm through a pair of crystallization rollers rotating in opposite directions. The casting temperature of the molten steel is 1620°C and the continuous casting speed is 58m / min.

[0053] 3) On-line hot rolling and coiling of cast strip

[0054] The cast strip is rolled into a 1.5mm thick thin strip steel through 2-pass on-line hot rolling and coiled into a coil. The hot rolling temperature is 950°C, and the hot strip coiling temperature is 580°C.

[0055] 4) Leveling or straightening

[0056] The hot-...

Embodiment 2

[0062] 1) Smelting

[0063] The chemical composition of molten steel is: C: 0.035wt%, Si: 2.10wt%, Mn: 0.40wt%, Al: 0.035wt%, Sn: 0.03wt%, Sb: 0.20wt%, N: 0.003wt%, S: 0.005 wt%, O: 0.005wt%, Cu: 0.02wt%, Cr: 0.30wt%, Ni: 0.10wt%, V: 0.08wt%, Nb: 0.06wt%, Ti: 0.01wt%, P: 0.02wt% , and the rest are Fe and unavoidable impurities.

[0064] 2) Thin strip continuous casting

[0065] The molten steel qualified for smelting is continuously cast into a cast strip with a thickness of 2.1 mm through a pair of counter-rotating crystallization rollers. The casting temperature of the molten steel is 1580° C. and the continuous casting speed is 72 m / min.

[0066] 3) On-line hot rolling and coiling of cast strip

[0067] The cast strip is rolled into a 1.9mm thick thin steel strip through one pass of on-line hot rolling and coiled into a coil. The hot rolling temperature is 880°C, and the hot strip coiling temperature is 640°C.

[0068] 4) Leveling or straightening

[0069] The hot-roll...

Embodiment 3

[0075] 1) Smelting

[0076] The chemical composition of molten steel is: C: 0.008wt%, Si: 0.40wt%, Mn: 1.20wt%, Al: 0.50wt%, Sn: 0.05wt%, Sb: 0.08wt%, N: 0.005wt%, S: 0.003 wt%, O: 0.002wt%, Cu: 0.50wt%, Cr: 0.06wt%, Ni: 0.02wt%, V: 0.01wt%, Nb: 0.02wt%, Ti: 0.07wt%, P: 0.07wt% , and the rest are Fe and unavoidable impurities.

[0077] 2) Thin strip continuous casting

[0078] The molten steel qualified for smelting is continuously cast into a cast strip with a thickness of 1.4 mm through a pair of counter-rotating crystallization rollers. The casting temperature of the molten steel is 1680° C. and the continuous casting speed is 92 m / min.

[0079] 3) On-line hot rolling and coiling of cast strip

[0080] The cast strip is rolled into 1.0mm thick thin steel strip through 3 passes of on-line hot rolling and coiled into coils. The hot rolling temperature is 1120°C, and the hot rolled strip coiling temperature is 720°C.

[0081] 4) Leveling or straightening

[0082] The hot-...

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Abstract

The invention discloses a non-oriented silicon steel and a production method thereof. Molten steel is smelted by adopting a vacuum induction furnace. Molten steel is directly cast into a cast belt with the thickness between 1mm and 3mm through a pair of crystallization rollers rotating in opposite directions. The casting temperature of the molten steel is between 1500 DEG C and 1700 DEG C. The cast belt is subjected to one pass or multiple passes hot rolling and rolled into hot-rolled strip steel with thickness being 0.7mm and 2.5 mm. The hot rolling temperature is between 800 DEG C and 1150 DEG C, and the hot-rolled strip steel is coiled into a roll at the temperature between 500 DEG C and 800 DEG C. Normalizing annealing is conducted on the hot-rolled steel roll after the hot-rolled steel roll is subjected to a levelling or tension levelling working procedure with the elongation rate being 1.0% and 5.0%, and the normalizing annealing temperature is between 700 DEG C and 1000 DEG C. After the steel roll after normalizing annealing is subjected to cold rolling and the final annealing and coating working procedures, low-iron loss and high magnetic induction non-oriented silicon steel products are acquired. The non-oriented silicon steel products manufactured with the production method has high-proportion magnetic induction-favorable <100> and <110> structures, and the product magnetic induction is above 1.80 T.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a strip continuous casting, low cost, low energy consumption, high performance non-oriented silicon steel and a production method thereof. Background technique [0002] Silicon steel can be divided into oriented silicon steel and non-oriented silicon steel, both of which have excellent magnetic properties. Non-oriented silicon steel is an important soft magnetic material, which is mainly used to manufacture iron cores of various motors. Improving the magnetic properties of non-oriented silicon steel can improve motor efficiency, save energy and reduce consumption, and protect the environment. Reducing the iron loss of non-oriented silicon steel can reduce the energy consumption of the motor and improve the energy conversion efficiency; increasing the magnetic induction can form a higher magnetic induction intensity and improve the use efficiency when using the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/50C22C38/48C22C38/46C22C38/42C22C38/34C22C38/06C22C38/04C22C38/02C22C33/04C21D1/26C21D8/02
CPCC21D1/26C21D8/1222C22C33/04C22C38/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/06C22C38/34C22C38/42C22C38/46C22C38/48C22C38/50C22C38/60
Inventor 李化龙陈爱华施一新刘俭马毅周东升冯庆晓刘新院张淑娟吴圣杰
Owner SHAGANG GROUP
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