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Manufacturing method for high-grade cold-rolled non-oriented silicon steel

A technology of oriented silicon steel and manufacturing method, which is applied in the field of manufacturing high-grade cold-rolled non-oriented silicon steel, and can solve problems such as carburization of molten steel, failure of carbon and sulfur elements to meet the requirements at the same time, and failure of titanium elements to meet the target requirements, etc.

Inactive Publication Date: 2012-03-14
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The problem of desulfurization and titanium removal, desulfurization requires reducing conditions, and titanium will also enter molten steel from steel slag under reducing conditions, resulting in a high content of titanium in the finished product
[0004] 2. The problem of decarburization and desulfurization. High-grade oriented silicon steel has extremely high requirements for sulfur, but desulfurization in vacuum decarburization equipment requires a large amount of desulfurization agent, which will lead to carbonization of molten steel, resulting in higher elemental carbon content in the finished product
[0005] Therefore, the titanium element cannot meet the target requirements, and the carbon and sulfur elements cannot meet the requirements at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] What this embodiment smelts is the steel type DW290.

[0026] This embodiment includes the following steps in sequence:

[0027] I Converter tapping 77.8t molten steel containing C, Mn, P, S and O as the following mass percentages is blended into a 90t ladle:

[0028] C 0.03%; Mn 0.03%; P 0.007%; S 0.0065%; O 0.053%.

[0029] The rest are Fe and unavoidable impurities and elements that cannot be detected by chemical analysis.

[0030] The temperature of the molten steel is 1596°C, the vertical distance from the free space of the ladle, that is, the slag surface to the upper edge of the ladle, is 400 mm, and the thickness of the slag layer is 100 mm.

[0031] II Open the ladle to the slag removal position of the ladle furnace, and control the slag thickness below 20mm;

[0032] III In the ladle furnace, slag is made and the temperature is raised, adding 300Kg of lime and 100Kg of fluorite, and the temperature is raised to 1644°C by power transmission;

[0033] IV Lif...

Embodiment 2

[0047] The steel grade smelted in this embodiment is steel grade DW310.

[0048] This embodiment includes the following steps in sequence:

[0049] 1 converter tapping will contain C, Mn, P, S and O and be that 79.2t molten steel of following mass percent is blended into 90t ladle:

[0050] C 0.03%; Mn 0.05; P 0.011%;

[0051] S 0.0054%; O 0.056%;

[0052] The rest are Fe and unavoidable impurities and elements that cannot be detected by chemical analysis.

[0053] The temperature of the molten steel is 1612°C, the vertical distance from the free space of the ladle, that is, the slag surface to the upper edge of the ladle, is 400 mm, and the thickness of the slag layer is 100 mm.

[0054] II Open the ladle to the slag removal position of the ladle furnace, and control the slag thickness below 20mm;

[0055] III In the ladle furnace, slag is made and the temperature is raised, adding 300Kg of lime and 100Kg of fluorite, and the temperature is raised to 1645°C by power trans...

Embodiment 3

[0069] The steel grade smelted in this embodiment is steel grade DW270.

[0070] This embodiment includes the following steps in sequence:

[0071] 1 Converter tapping will contain C, Mn, P, S and O and blend 78.6t molten steel into 90t ladle for the following mass percentages:

[0072] C 0.035%; Mn 0.04; P 0.010%; S 0.0048%;

[0073] O 0.055%;

[0074] The rest are Fe and unavoidable impurities and elements that cannot be detected by chemical analysis.

[0075] The temperature of the molten steel is 1612°C, the vertical distance from the free space of the ladle, that is, the slag surface to the upper edge of the ladle, is 400mm, and the thickness of the slag layer is 80mm.

[0076] II Open the ladle to the slag removal position of the ladle furnace, and control the slag thickness below 20mm;

[0077] III In the ladle furnace, slag is made and the temperature is raised, adding 300Kg of lime and 100Kg of fluorite, and heating up to 1643°C by power transmission;

[0078] IV L...

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Abstract

The invention relates to a manufacturing method for high-grade cold-rolled non-oriented silicon steel. The manufacturing method sequentially comprises the following: step I of adding molten steel into steel ladle, wherein carbon content of the molten steel is 0.02%-0.05%, oxygen content of the molten steel is 0.04%-0.08%, and temperature of the molten steel is not below 1590 DEG C; step II of opening the steel ladle to a slagging-off position of a ladle furnace to remove slag, wherein thickness of the slag is controlled to be smaller than 20mm; step III of slagging and heating the ladle furnace, wherein 3.8+ / -0.2Kg lime and 1.3+ / -0.2Kg fluorite are added into each ton of molten steel, and the ladle furnace is electrically heated to be not below 1630 DEG C; step IV of lifting the steel ladle into vacuum decarbonizing equipment for vacuum treatment, and extracting the vacuum degree to be below 1mbar after vacuumization is carried out for 3 minutes; step V of adding aluminum and silicon into the steel ladle, wherein 42+ / -4Kg ferrosilicon is added into each ton of molten steel, and 1+ / -0.2Kg lime and 0.67+ / -0.1Kg fluorite are added into each ton of molten steel to desulfurize 1% S; and step VI of circulating not less than 10min treatment after the lime and the fluorite are added. When the manufacturing method for the high-grade cold-rolled non-oriented silicon steel is adopted, content of carbon, sulfur and titanium in steel is reduced.

Description

technical field [0001] The invention relates to a method for manufacturing high-grade cold-rolled non-oriented silicon steel. Background technique [0002] The difficulty in the manufacturing method of high-grade cold-rolled non-oriented silicon steel mainly lies in the control of C, S, and Ti elements in the steel grade. The existing high-grade cold-rolled non-oriented silicon steel manufacturing method has the following problems: [0003] 1. The problem of desulfurization and titanium removal, desulfurization requires reducing conditions, and titanium will also enter molten steel from steel slag under reducing conditions, resulting in a high content of titanium in the finished product. [0004] 2. The problem of decarburization and desulfurization. High-grade oriented silicon steel has extremely high requirements for sulfur, but desulfurization in vacuum decarburization equipment requires a large amount of desulfurizer, which will lead to carbonization of molten steel, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/068C21C7/064C21C7/10
Inventor 侯东涛张霞陈泽民
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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