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A kind of grain-oriented silicon steel and its preparation method

A technology of grain-oriented silicon steel and steel coil, applied in the field of grain-oriented silicon steel and its preparation, can solve the problem of lack of mass production, and achieve the effect of ensuring electromagnetic performance and improving suppression ability

Active Publication Date: 2018-12-28
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the essential difference between the physical and metallurgical characteristics of the thin slab process and the traditional grain-oriented silicon steel production process, the country does not yet have the capacity for mass production, and a large number of researches are still in the technical research stage.

Method used

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  • A kind of grain-oriented silicon steel and its preparation method
  • A kind of grain-oriented silicon steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation process steps of grain-oriented silicon steel are as follows:

[0038] 1) Continuous casting of molten iron pretreatment, converter steelmaking, and vacuum treatment into 230mm billets;

[0039] 2) Heating the billet to 1250°C for 280 minutes in the furnace, of which the effective holding time at 1250°C is 85 minutes;

[0040] 3) The cast slab is subjected to rough rolling for 3 passes, the thickness of the intermediate slab is 35mm, the starting temperature of the finishing rolling is controlled at 1080°C, the finishing rolling temperature is 950°C, the coiling temperature is 560°C, and the thickness after finishing rolling is 2.3mm;

[0041] 4) After the hot-rolled raw material is pickled, it is cold-rolled for the first time, with a thickness of 0.66mm;

[0042] 5) Decarburization annealing is performed on the primary cold-rolled coil, the decarburization annealing temperature is 830°C, the dew point is 35°C, the decarburization soaking time is 6min,...

Embodiment 2

[0049] The preparation process steps of grain-oriented silicon steel are as follows:

[0050] 1) The steel with the above chemical composition is continuously cast into a 250mm billet after molten iron pretreatment, converter steelmaking, and vacuum treatment;

[0051] 2) Heating the billet to 1280°C for 370 minutes in the furnace, of which the effective holding time at 1280°C is 110 minutes;

[0052] 3) The cast slab is subjected to 5 passes of rough rolling, the thickness of the intermediate slab is 45mm, the start rolling temperature of finish rolling is controlled at 1110°C, the finish rolling temperature is 980°C, the coiling temperature is 550°C, and the thickness after finish rolling is 2.3mm;

[0053] 4) After the hot-rolled raw material is pickled, it is cold-rolled for the first time, with a thickness of 0.70mm;

[0054] 5) Decarburization annealing is performed on the primary cold-rolled coil, the decarburization annealing temperature is 820°C, the dew point is 40°...

Embodiment 3

[0061] The preparation process steps of grain-oriented silicon steel are as follows:

[0062] 1) The steel with the above chemical composition is continuously cast into a 230mm billet after molten iron pretreatment, converter steelmaking, and vacuum treatment;

[0063] 2) Heating the billet to 1300°C for 410 minutes in the furnace, of which the effective holding time at 1300°C is 125 minutes;

[0064] 3) The cast slab is subjected to rough rolling for 3 passes, the thickness of the intermediate slab is 35mm, the starting temperature of the finish rolling is controlled at 1150°C, the finish rolling temperature is 980°C, the coiling temperature is 550°C, and the thickness after finish rolling is 2.0mm;

[0065] 4) After the hot-rolled raw material is pickled, it is cold-rolled for the first time, with a thickness of 0.63mm;

[0066] 5) Decarburization annealing is performed on the primary cold-rolled coil, the decarburization annealing temperature is 830°C, the dew point is 40°...

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Abstract

The invention relates to oriented silicon steel and a preparing method thereof. The oriented silicon steel comprises, by weight, 0.030%-0.070% of C, 2.8%-3.5% of Si, 0.15%-0.30% of Mn, 0.35%-0.80% of Cu, 0.0040%-0.015% of S, 0.015%-0.025% of Als, 0.070%-0.015% of N, smaller than or equal to 0.020% of P, 0.002%-0.02% of Ti, and the balance Fe and inevitable impurities, wherein C / Ti is smaller than or equal to 10, and Cu / S is larger than or equal to 50. The preparing method comprises the steps of converter smelting, vacuum treatment, continuous casting, soaking pit heating, hot continuous rolling, first-time cold rolling, decarburization annealing, second-time cold rolling, MgO parting agent coating, high-temperature annealing and rewinding, the iron loss P1.7 of the oriented silicon steel is smaller than 1.18 W / kg, and the magnetic inductance B8 of the oriented silicon steel is larger than or equal to 1.86 T.

Description

technical field [0001] The invention belongs to the technical field of iron and steel manufacturing, and in particular relates to an oriented silicon steel and a preparation method thereof. Background technique [0002] In the production process of grain-oriented silicon steel, in order to produce a secondary recrystallization structure with accurate orientation, it is necessary to obtain fine and dispersed inhibitor particles before the final high temperature annealing. In order to obtain dispersed second-phase particles, it must be Using a very high heating temperature and a long heating time, the coarse second phase particles are fully dissolved, and then precipitated during the cold rolling process. High-temperature heating will bring huge risks to heating equipment, and will also cause a series of problems such as increased energy consumption, loss of yield, and reduced output. Therefore, in recent years, the use of second heating and enhanced inhibitor development cap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/16C22C38/06C22C38/14C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0257C22C38/001C22C38/02C22C38/04C22C38/06C22C38/14C22C38/16
Inventor 裴英豪王立涛施立发裴陈新夏雪兰张振海
Owner MAANSHAN IRON & STEEL CO LTD
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