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Production method of non-oriented silicon steel and non-oriented silicon steel

A technology of oriented silicon steel and a production method, applied in the direction of manufacturing converters, etc., can solve the problem of high production cost, and achieve the effects of low production cost, reduced difficulty and reduced requirements.

Active Publication Date: 2020-12-29
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem of high production cost caused by the ultra-low S chemical composition design scheme of non-oriented silicon steel in the prior art, the purpose of the present invention is to provide a production method of non-oriented silicon steel, and also relates to a non-oriented silicon steel

Method used

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  • Production method of non-oriented silicon steel and non-oriented silicon steel
  • Production method of non-oriented silicon steel and non-oriented silicon steel
  • Production method of non-oriented silicon steel and non-oriented silicon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4 and comparative example 1

[0126] Examples 1-4 and Comparative Example 1, the converter smelting steps are: the tapping in the aforementioned molten iron desulfurization step (that is, the molten iron after desulfurization) is moved into the converter, and clean scrap steel is mixed in the converter, and the addition of scrap steel accounts for 20-25% of the sum of steel scrap and molten iron. After desulfurization, the molten iron and steel scrap are smelted into molten steel in the converter; during the tapping process, lime is added first, and then the final product contains Sn: 0.015% into the tapping molten steel Add enough tin ingots; after tapping, add slag surface deoxidizer to molten steel.

[0127] (3) RH refining process

Embodiment 1

[0130] In embodiment 1, as shown in Table 1, S≤0.0030% when the molten steel reaches RH refining, add super Low-titanium ferrosilicon, low-titanium ferrophosphorus and metal manganese, the mass percentage of the actual chemical composition of the RH refining steel is shown in Table 1;

Embodiment 2

[0131] In Example 2, as shown in Table 1, when the molten steel reaches RH refining, 0.0030%<S≤0.0045%, according to Si:0.40% in the final product, Sn:0.020%, P:0.04~0.06%, Mn:0.15~ Add ultra-low titanium ferrosilicon, tin ingot, low titanium phosphorus ferrophosphorus and metal manganese to molten steel at 0.25%, and the mass percentage of the actual chemical composition of the steel produced by RH refining is shown in Table 1;

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Abstract

The invention discloses non-oriented silicon steel and a production method thereof. The non-oriented silicon steel is prepared by molten iron sulfur removal, converter smelting, RH refining, continuous casting, hot rolling, acid continuous rolling, annealing, coating and finishing, and comprises the following chemical components in percentage by mass: less than or equal to 0.003% of C, less than or equal to 0.008% of S, 0.35%+delta1 of Si, 0.15-0.25% of Mn, 0.04-0.06% of P, 0.015%+delta 2 of Sn, less than or equal to 0.004% of Nb, less than or equal to 0.004% of V, less than or equal to 0.005%of Ti, less than or equal to 0.004% of Mo, less than or equal to 0.03% of Cr, less than or equal to 0.03% of Ni, less than or equal to 0.03% of Cu, less than or equal to 0.003% of N and the balance of Fe and inevitable inclusions. When the thickness of the non-oriented silicon steel is 0.5 mm, P1.5 / 50 is less than or equal to 5.5 W / kg, B5000 is larger than or equal to 1.75, and sulfur removal treatment is not needed in RH refining.

Description

technical field [0001] The invention belongs to the technical field of steel material preparation, relates to a production method of non-oriented silicon steel, and also relates to a non-oriented silicon steel prepared by the production method. Background technique [0002] Non-oriented silicon steel is the iron core material of the motor and generator rotor working in the rotating magnetic field, requiring good magnetic properties. Usually in order to ensure the magnetic properties of non-oriented silicon steel, the control of chemical composition is very strict. Among them, when producing and preparing non-oriented silicon steel, S element will undergo solid solution and precipitation in the form of MnS in the steel, which hinders the grain growth during annealing, and then affects the magnetic properties of the finished product, which is specifically reflected in the reduction of magnetic induction intensity and Increase iron loss. Therefore, in the prior art, in the ch...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C21C1/02C21C5/28C21C7/10C21C7/068C22C33/06C21D8/12
CPCC22C38/004C22C38/02C22C38/008C22C38/002C22C38/04C21C1/02C21C5/28C21C7/10C21C7/068C22C33/06C21D8/1222C21D8/1233C21D8/1244Y02P10/20C21D9/46C21D8/1205C21D8/1272C21D1/76C21D8/1261C21D8/1277C21D1/60C21C7/0645C21C7/064H01F1/14783H01F1/18C22C38/42C22C38/50C22C38/46C22C38/44C22C38/001H01F1/147C21C7/0006C21D1/74C21D1/84C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/021C21D8/0226C21D8/0236C21D8/0263C21D8/0278C21D9/52C22C33/04C22C38/48C22C2202/02C23G1/08
Inventor 岳重祥陆佳栋周彦召李化龙
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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