Production method of Si-free semi-processed cold-rolled non-oriented silicon steel containing Mn

A technology of oriented electrical steel and production methods, applied in the direction of improving process efficiency, etc., can solve problems such as large differences in product performance, and achieve the effects of good processing performance, good dimensional accuracy, and good process performance

Inactive Publication Date: 2016-11-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the different annealing equipment used by different manufacturers, the performance of the annealing process varies greatly after annealing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A production method of Si-free and Mn-containing semi-process cold-rolled non-oriented electrical steel:

[0032] Step 1) Pretreatment of molten iron: first pour molten iron from the blast furnace into the molten iron ladle, and blow the converter through oxygen top-bottom compound blowing;

[0033] Step 2) Converter smelting: Pour molten steel into an oxygen top-bottom compound blowing converter, add scrap steel accounting for 10% of the total weight into the converter at the same time, and add limestone and fluorite into the converter during the blowing process. Argon blowing process, when the composition of molten steel [C]≤0.04%, [P]≤0.015%, [S]≤0.015%, when the end point temperature of molten steel is 1680 ℃, fixed oxygen tapping;

[0034] Step 3) Argon blowing: add a composite deoxidizer when tapping the converter, blow argon throughout the process of tapping the converter, measure the temperature of the molten steel after blowing the argon, set the oxygen, take s...

Embodiment 2

[0047] A production method of Si-free and Mn-containing semi-process cold-rolled non-oriented electrical steel:

[0048] Step 1) Pretreatment of molten iron: first pour molten iron from the blast furnace into the molten iron ladle, and blow the converter through oxygen top-bottom compound blowing;

[0049] Step 2) Converter smelting: Pour molten steel into an oxygen top-bottom compound blowing converter, add scrap steel accounting for 10% of the total weight into the converter at the same time, and add limestone and fluorite into the converter during the blowing process. Argon blowing process, when the composition of molten steel [C]≤0.04%, [P]≤0.015%, [S]≤0.015%, when the end point temperature of molten steel is 1680 ℃, fixed oxygen tapping;

[0050] Step 3) Argon blowing: add a composite deoxidizer when tapping the converter, blow argon throughout the process of tapping the converter, measure the temperature of the molten steel after blowing the argon, set the oxygen, take s...

Embodiment 3

[0063] A production method of Si-free and Mn-containing semi-process cold-rolled non-oriented electrical steel:

[0064] Step 1) Pretreatment of molten iron: first pour molten iron from the blast furnace into the molten iron ladle, and blow the converter through oxygen top-bottom compound blowing;

[0065] Step 2) Converter smelting: Pour molten steel into an oxygen top-bottom compound blowing converter, add scrap steel accounting for 10% of the total weight into the converter at the same time, and add limestone and fluorite into the converter during the blowing process. Argon blowing process, when the composition of molten steel [C]≤0.04%, [P]≤0.015%, [S]≤0.015%, when the end point temperature of molten steel is 1680 ℃, fixed oxygen tapping;

[0066] Step 3) Argon blowing: add a composite deoxidizer when tapping the converter, blow argon throughout the process of tapping the converter, measure the temperature of the molten steel after blowing the argon, set the oxygen, take s...

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Abstract

The invention discloses a production method of Si-free semi-processed cold-rolled non-oriented silicon steel containing Mn. The method comprises the first step of hot metal pretreatment, wherein blast-furnace hot metal is poured into a hot metal ladle at first, and top and bottom combined converter blowing is carried out through oxygen; the second step of converter smelting; the third step of argon blowing; the fourth step of LF refining, wherein molten steel is fed into an LF refining furnace to be smelted; the fifth step of casting; the sixth step of acid pickling and cold rolling; the seventh step of annealing, wherein annealing at the temperature of 680-770 DEG C is carried out for 6-8 h after cold rolling; and the eighth step of aftertreatment. The Si-free semi-processed cold-rolled non-oriented silicon steel containing Mn is stable in product performance, good in surface quality, strip shape quality and size precision, capable of meeting national standards and client requirements, and good in product machining performance.

Description

technical field [0001] The invention relates to a production method of non-oriented semi-process electrical steel, in particular to a production method of Si-free and Mn-containing semi-process cold-rolled non-oriented electrical steel. Background technique [0002] Electrical steel is an important raw material product that is indispensable for a country's economic construction and people's life. Its products are used to make various transformers and motor cores, which play a very important role in the country's energy saving and consumption reduction, low-carbon environmental protection. China is a big power consumer in the world, and motors with a wide range of uses are the largest power consumers. The power consumption accounts for 60% to 70% of a country's power generation, and the power consumption of small and medium-sized motor systems accounts for 70% of the total power consumption of industrial systems. Around %, governments and international organizations around th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21D8/12C22C38/04C22C38/06
CPCC21D8/1222C21D8/1233C21D8/1238C21D8/1255C21D8/1272C22C33/04C22C38/04C22C38/06Y02P10/20
Inventor 周峰李烈军陈松军高吉祥孙海波彭政务胡玲卢布金硕勋陈紫默
Owner SOUTH CHINA UNIV OF TECH
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