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Low-carbon high-manganese oriented electrical steel plate, and its manufacturing method

A technology of oriented electrical steel sheet and manufacturing method, applied in the direction of manufacturing tools, metal rolling, temperature control, etc., can solve the problems of many process links, high annealing temperature, high heating temperature, etc., and achieve simple cold rolling process, high yield, The effect of reducing the amount of decarburization

Inactive Publication Date: 2008-11-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main method used by Nippon Steel and Sumitomo Metals to reduce the heating temperature of slabs is to use AlN as the main inhibitor and carry out nitriding treatment. There are many process links, complicated technology and high difficulty
South Korea's Pohang Iron and Steel Company uses AlN as the main inhibitor, Cu 2 S and MnS are auxiliary inhibitors with complex composition, high heating temperature and high final annealing temperature

Method used

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  • Low-carbon high-manganese oriented electrical steel plate, and its manufacturing method
  • Low-carbon high-manganese oriented electrical steel plate, and its manufacturing method
  • Low-carbon high-manganese oriented electrical steel plate, and its manufacturing method

Examples

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Effect test

example 1

[0024] A kind of manufacture method of example 1 low-carbon high-manganese grain-oriented electrical steel sheet

[0025]A new type of steel slab, the slab thickness is 150-300mm, its chemical composition is, C is 0.006wt%, Si is 2.1wt%, Mn is 1.6wt%, Als is 0.03wt%, Nb is 0.03wt% , N is 0.0070wt%, P is 0.013wt%, the rest is Fe and unavoidable impurities, and the inhibitors are AlN and NbN.

[0026] Heat the slab to 1270°C and keep it warm for 3 hours; then carry out hot rolling, the reduction ratio of the last 3 passes of the hot rolling process is 15%, the final rolling temperature is 860°C, relax for 50 seconds after rolling, and then Carry out rapid cooling, and the cooling rate of rapid cooling is 30 ℃ / second, obtains the hot-rolled strip coil that precipitate and structure are fine and uniform, cancels the normalization annealing of hot-rolled strip coil. Rapid cooling and coiling after hot rolling, the cooling rate of rapid cooling is 10-200°C / s;

[0027] Carry out an...

example 2

[0032] A kind of manufacture method of example 2 low carbon high manganese grain oriented electrical steel sheet

[0033] A new steel slab with a thickness of 150-300mm, and its chemical composition is: C is 0.010wt%, Si is 2.3wt%, Mn is 1.5wt%, Als is 0.02wt%, Nb is 0.06wt%, N is 0.009wt%, P is 0.013wt%, the rest is Fe and unavoidable impurities, and the inhibitors are AlN, NbC and NbN.

[0034] Heating the slab to 1300°C and keeping it warm for 3 hours; then performing hot rolling, the reduction rate of the last 3 passes of the hot rolling process is 20%, the final rolling temperature is 1000°C, and relaxing for 40 seconds after rolling; then Carry out quick cooling and coiling, the cooling rate of quick cooling is 40 ℃ / second, obtain the hot-rolled coil that precipitate and structure are fine and uniform, cancel the normalized annealing of hot-rolled coil.

[0035] Carry out another cold rolling, the total reduction rate is more than or equal to 82%, and directly roll to t...

example 3

[0040] A kind of manufacture method of example 3 low-carbon high-manganese grain-oriented electrical steel sheets

[0041] A new steel slab with a thickness of 150-300mm, and its chemical composition is: C is 0.020wt%, Si is 2.3wt%, Mn is 1.5wt%, Als is 0.015wt%, Nb is 0.11wt%, N is 0.011wt%, P is 0.014wt%, the rest is Fe and unavoidable impurities, and the inhibitors are AlN and NbC.

[0042] Heat the slab to 1260°C and keep it warm for 3 hours; carry out hot rolling, the reduction rate of the last pass of the hot rolling process is 28%, the final rolling temperature is 980°C, and relax for 45 seconds after rolling; then carry out Rapid cooling and coiling, the cooling rate of rapid cooling is 50°C / s, and the hot-rolled coils with fine and uniform precipitates and structures are obtained, and the normalizing annealing of the hot-rolled coils is cancelled.

[0043] Carry out another cold rolling, the total reduction ratio is ≥ 88%, and directly roll to the final thickness. T...

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Abstract

The invention deals with the low carbon and the high manganese tropism electric armor plate and the producing process. The technical project is showed as follow: the new steel board embryo is heated to the temperature of 1200-1320, the temperature keeps 2-5 hours; the heat rolling, the quick cooling and the coiling are performed; the thickness of the board reaches below the 0.35mm according to the one cool rolling method; the decarbonization and anneal are performed, the magnesia separating layer is smeared to coiling, finally, the high temperature and the anneal are performed. The chemical elements of the board embryo are showed below: c is 0.004-0.030wt%, Si is 2.1-2.4wt%, Mn is 1.2-1.8wt%, ALs is 0.001-0.04wt%, Nb is 0.01-0.12wt%, N is 0.004_0.030wt%, P is 0.015wt%, the rest is Fe and the unavoidable impurity. The invention has many merits such as the low heating temperature, the low temperature of final anneal, the omitting of the rolling board melting (the anneal), the brief cool rolling process, the low quantity of the decarburization and the high ratio becoming the eligible production.

Description

1. Technical field: [0001] The invention belongs to the technical field of oriented electrical steel plates. In particular, it relates to a low-carbon high-manganese oriented electrical steel sheet and a manufacturing method thereof. 2. Background technology [0002] At present, there are three representative technologies for the industrial production of grain-oriented electrical steel sheets: (1) the secondary cold rolling method with MnS as the main inhibitor; Cold rolling method; (3) secondary cold rolling method using MnS (and / or MnSe)+Sb as inhibitor. In the above three technologies, in order to ensure stable high magnetic properties, the inhibitor must be completely dissolved, and the slab must be heated at high temperature (about 1400°C). [0003] In the production process of grain-oriented electrical steel, in order to control the recrystallization process and obtain a certain texture, inhibitors are essential. The traditional inhibitors are mainly MnS and AlN. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/12B21B37/74B21B37/58B21B37/16C21D11/00C21D1/26C21D1/74
Inventor 吴开明
Owner WUHAN UNIV OF SCI & TECH
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