High silicon cold-rolled non-oriented electrical steel and its preparation method

A technology of grain-oriented electrical steel and high silicon, applied in the direction of improving process efficiency, etc., can solve the problems of frequent edge cracks and broken belts, fluctuations in electromagnetic properties of finished products, and strong thermal sensitivity of high silicon steels.

Active Publication Date: 2014-06-25
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of silicon content, the resistivity and magnetic permeability increase, and the iron loss decreases, but when the silicon content reaches 3.3%, the cold workability of steel grades drops sharply, and edge cracks and broken strips are frequent during cold rolling, and high-grade steel grades It needs to be produced by secondary cold rolling method, the yield and production efficiency are low, and the production cost is greatly increased. At the same time, high-silicon steel is highly sensitive to heat. In the process of thermal state, it is affected by temperature fluctuations, resulting in fluctuations in the electromagnetic properties of the finished product. Therefore, the development of high-silicon electrical steel has been restricted to a certain extent.
[0003] At present, there are many types of alloy additions in the existing technology, and the total cost is high

Method used

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  • High silicon cold-rolled non-oriented electrical steel and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: C: 0.0011%, Si: 2.15%, Mn: 0.20%, P: 0.008%, S: 0.0013%, Als: 1.68%, N: 0.0019%, Ti: 0.0010%, Nb: 0.0015%, V : 0.0018%; the balance is iron and other unavoidable impurity elements.

[0022] The process steps are as follows:

[0023] a) Smelting: Converter smelting, RH vacuum refining treatment, control the content of elements such as sulfur, carbon, and niobium, vanadium, titanium that are easy to form fine dispersed two-phase particles;

[0024] b) Continuous casting: the molten steel is cast into a slab by continuous casting, the overheating temperature is 40°C, the pulling speed is 0.7m / min, and the ratio of equiaxed crystal ratio is 68%;

[0025] c) Hot rolling: billet heating temperature is 1100°C, high-temperature plan is adopted for key finish rolling and final rolling coiling, starting rolling temperature is 1020°C, finishing rolling temperature is 870°C, coiling temperature is 700°C, plate thickness is 1.5mm;

[0026] d) Normalization: use a normal...

Embodiment 2

[0030] Example 2: C: 0.0014%, Si: 2.3%, Mn: 0.25%, P: 0.007%, S: 0.0014%, Als: 1.70%, N: 0.0020%, Ti: 0.0012%, Nb: 0.0017%, V : 0.0013%; the balance is iron and other unavoidable impurity elements.

[0031] The process steps are as follows:

[0032] a) Smelting: Converter smelting, RH vacuum refining treatment, controlling the content of elements such as sulfur, carbon, and niobium, vanadium, and titanium that are easy to form fine dispersed two-phase particles;

[0033] b) Continuous casting: the molten steel is cast into a slab by continuous casting, the overheating temperature is 45°C, the pulling speed is 0.75m / min, and the ratio of equiaxed crystal ratio is 65%;

[0034] c) Hot rolling: billet heating temperature is 1120°C, key finish rolling and finishing coiling adopt high temperature plan, starting rolling temperature is 1030°C, finishing rolling temperature is 875°C, coiling temperature is 710°C, plate thickness is 1.5mm;

[0035] d) Normalization: use a normalized ...

Embodiment 3

[0039] Example 3: C: 0.0013%, Si: 2.48%, Mn: 0.25%, P: 0.007%, S: 0.0012%, Als: 1.90%, N: 0.0020%, Ti: 0.0011%, Nb: 0.0012%, V : 0.0017%; the balance is iron and other unavoidable impurity elements.

[0040] The process steps are as follows:

[0041] a) Smelting: Converter smelting, RH vacuum refining treatment, control the content of elements such as sulfur, carbon, and niobium, vanadium, titanium that are easy to form fine dispersed two-phase particles;

[0042] b) Continuous casting: the molten steel is cast into a slab by continuous casting, the overheating temperature is 48°C, the pulling speed is 0.8m / min, and the ratio of equiaxed crystal ratio is 63%;

[0043] c) Hot rolling: the billet heating temperature is 1130°C, the high temperature plan is adopted for the key finish rolling and final rolling coiling, the starting rolling temperature is 1040°C, the finishing rolling temperature is 880°C, the coiling temperature is 720°C, and the plate thickness is 1.5mm;

[0044...

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Abstract

The invention provides high silicon cold-rolled non-oriented electrical steel and its preparation method, the high silicon cold-rolled non-oriented electrical steel comprises the following chemical components by weight: less than 0.0015% of C, 2.0%-2.5% of Si, 0.10%-0.3% of Mn, less than or equal to 0.008% of P, less than 0.0015% of S, less than or equal to 0.0020% of N, 1.5%-2% of Als, less than 0.0020% of Ti, less than 0.0020% of Nb, less than 0.0020% of V, and balance of Fe and other inevitable residual elements. The preparation method comprises smelting, continuous casting, hot rolling, normalizing, cold rolling, two-stage annealing and final product annealing, through the composition design using Si and high Al, each technical process is controlled, a high silicon effect is achieved, adding of REM, Ca, Mg, Sb, Sn trace alloy elements is avoided, the cost is reduced, and the product production process stability and finished product electromagnetic property improvement are facilitated.

Description

technical field [0001] The invention relates to the technical field of production of electrical steel products, in particular to cold-rolled non-oriented electrical steel with relatively high silicon content and a production method thereof. Background technique [0002] With the increase of silicon content in high-grade electrical steel, the mechanism and characteristics change, and the contradictions in production become prominent. With the increase of silicon content, the resistivity and magnetic permeability increase, and the iron loss decreases, but when the silicon content reaches 3.3%, the cold workability of steel grades drops sharply, and edge cracks and broken strips are frequent during cold rolling, and high-grade steel grades It needs to be produced by secondary cold rolling method, the yield and production efficiency are low, and the production cost is greatly increased. At the same time, high-silicon steel is highly sensitive to heat. In the process of thermal s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C33/04C21D8/12
CPCY02P10/20
Inventor 高振宇张智义陈春梅金文旭李文权罗理袁皓张仁波李元华李亚东
Owner ANGANG STEEL CO LTD
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