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Preparation method of rare earth Nd containing Fe-6.9%Si strip

A thin strip and rare earth technology is applied in the field of steel rolling to achieve the effects of low production cost, improved texture strength and reduced high frequency iron loss

Active Publication Date: 2019-08-23
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, scholars at home and abroad only use the light rare earth element Ce as the rare earth element added to high silicon steel, but there is no report on the application of the same light rare earth element neodymium (Nd) in high silicon steel.

Method used

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  • Preparation method of rare earth Nd containing Fe-6.9%Si strip
  • Preparation method of rare earth Nd containing Fe-6.9%Si strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Vacuum induction furnace is used to cast high-silicon steel ingots, and its chemical composition is as follows: Si 6.95%, Nd 0.032%, C 0.008%, Mn 0.009%, P 0.005%, S 0.004%, N 0.002%, O 0.002% , the balance Fe. At a temperature of 1250°C, after holding for 220 minutes, the billet was free-forged into a 50mm thick billet by air. The heating temperature of the slab hot rolling is 1170°C, the holding time is 110min, and then asynchronous hot rolling is carried out on a reversible asynchronous hot rolling mill with a different speed ratio of 1.2, the lower roll speed is 0.6m / s, and the upper roll speed is 0.78m / s. The final rolling temperature is 880°C, after 10 passes of hot rolling to 3mm, water cooling.

[0034] Pickling with 5% concentration of hydrochloric acid solution and then warm rolling. In the first stage of the warm rolling process, the rolling plate is heated to 650°C, warm rolled to 2mm, the pass reduction rate is 14%, and the rolling force is 230kN. In the...

Embodiment 2

[0038] Vacuum induction furnace is used to cast high-silicon steel ingots, and its chemical composition is as follows: Si 6.91%, Nd 0.038%, C 0.009%, Mn 0.008%, P 0.004%, S 0.003%, N 0.001%, O 0.002% , the balance Fe. At a temperature of 1220°C, after 220 minutes of heat preservation, air free forging was used to form a 50mm thick billet. The heating temperature of the slab hot rolling is 1150°C, the holding time is 100min, and then asynchronous hot rolling is carried out on a reversible asynchronous hot rolling mill with a different speed ratio of 1.2, the lower roll speed is 0.5m / s, and the upper roll speed is 0.6m / s. The final rolling temperature is 890°C, after 10 passes of hot rolling to 2.7mm, it is water-cooled.

[0039] Pickling with 7% concentration of hydrochloric acid solution and then warm rolling. In the first stage of the warm rolling process, the rolling plate is heated to 680°C, warm rolled to 1.7mm, the pass reduction rate is 13%, and the rolling force is 22...

Embodiment 3

[0043] Vacuum induction furnace is used to cast high-silicon steel ingots, and its chemical composition is as follows: Si 6.96%, Nd 0.043%, C 0.008%, Mn 0.009%, P 0.004%, S 0.004%, N 0.002%, O 0.002% , the balance Fe. At a temperature of 1200°C, after holding for 210 minutes, it is free-forged into a 50mm-thick billet by air. The heating temperature of the slab hot rolling is 1170°C, the holding time is 90min, and then asynchronously hot rolling, the speed ratio is 1.3, the roll speed of the lower roll is 0.4m / s, and the roll speed of the upper roll is 0.52m / s. The final rolling temperature is 900°C, after 11 passes of hot rolling to 2.3mm, it is water-cooled.

[0044] Pickling with 7% concentration of hydrochloric acid solution and then warm rolling. In the first stage of the warm rolling process, the rolling plate is heated to 700°C, warm rolled to 1.5mm, the pass reduction rate is 12%, and the rolling force is 210kN. In the second stage, the rolled plate is heated to 580°...

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Abstract

The invention relates to a preparation method of a rare earth Nd containing Fe-6.9%Si strip, and belongs to the technical field of steel rolling processes. According to the preparation method of the rare earth Nd containing Fe-6.9%Si strip, chemical components of the strip comprise, by weight percent, 6.91%-6.98% of Si, 0.03%-0.05% of Nd, smaller than 0.01% of C, smaller than 0.01% of Mn, smallerthan 0.01% of P, smaller than 0.01% of S, smaller than 0.003% of N smaller than 0.003% of O and the balance Fe, and the thickness of the strip ranges from 0.15 mm to 0.2 mm. The method comprises the steps of smelting, forging, asynchronous hot rolling, acid pickling, warm rolling, intermediate annealing, acid pickling, asynchronous cold rolling and continuous annealing. The microalloying metod ofadding light rare earth Nd into Fe-6.9%Si steel so as to improve plasticity is provided. On the basis, the high-silicon steel strip is prepared through the new technology of combining cold rolling andasynchronization, through microalloying and asynchronization rolling of the rare earth Nd, grains are refined, resistance to deformation is reduced, and the plastic deformation capacity of the high-silicon steel strip is improved.

Description

technical field [0001] The invention relates to a preparation method of Fe-6.9% Si thin strip containing rare earth Nd, which belongs to the technical field of steel rolling technology. Background technique [0002] With the rapid development of my country's UHV power transmission, high-frequency information technology, and national defense and military industries, in order to reduce noise and iron loss and improve energy utilization, the market demand for high-silicon electrical steel is increasing day by day. High-silicon steel has excellent soft magnetic properties, such as high magnetic permeability, low coercive force, low iron loss and almost zero magnetostriction coefficient, and has broad application prospects in high-frequency fields. Due to the impact of room temperature brittleness, the plastic deformation ability of high silicon steel is greatly reduced, and it is difficult to prepare thin plates with good shape by conventional rolling process, which limits its p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/02C21D8/12
CPCC21D8/1222C21D8/1227C21D8/1233C21D8/1244C22C38/005C22C38/02
Inventor 蔡国君黄艳茹杨阳何娇
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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