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DD750 cold-rolled low-carbon steel strip for electricians, and manufacturing method thereof

A technology of DD750, cold-rolled steel strip, applied in the field of cold-rolled steel strip manufacturing, can solve the problems of short service life, high content, poor electromagnetic performance of magnetic circuit iron core, etc.

Inactive Publication Date: 2013-05-15
XINYU IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the price of Q195 carbon structural steel is low, due to the high content of carbon and impurity elements, the iron loss is high (actual value is 11.0-14.0W / kg), the magnetic circuit core made of it has poor electromagnetic performance and high iron loss (iron Low loss can reduce the eddy current power consumption of the iron core and reduce the heat generation of the chip), resulting in high energy consumption, poor performance, and short service life of electrical appliances, which increases the burden on users and hinders technological progress

Method used

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  • DD750 cold-rolled low-carbon steel strip for electricians, and manufacturing method thereof
  • DD750 cold-rolled low-carbon steel strip for electricians, and manufacturing method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A kind of DD750 low-carbon steel cold-rolled strip for electricians of the present embodiment, the manufacturing method is as follows:

[0027] (1) Steelmaking and continuous casting process: smelting in a top-bottom re-blown oxygen converter, the molten steel is then refined in a RH vacuum furnace, and the alloy is added to adjust the composition. The cycle time is 6 minutes, and the composition is homogenized. After refining, the molten steel is sent to Continuous casting is carried out in the continuous casting workshop, the temperature of the tundish is 1538°C, the continuous casting is protected throughout the casting process, and the thickness of the continuous casting slab is 230mm. Sampling test results show that the composition of the slab is: C 0.003%, Mn 0.40%, Si 0.15%, P 0.095%, S 0.005%, and the rest are iron Fe and unavoidable impurity elements;

[0028] (2) Hot continuous rolling slab heating process: heating the slab to 1145°C, and the total hea...

Embodiment 2

[0033] A kind of DD750 low-carbon steel cold-rolled strip for electricians of the present embodiment, the manufacturing method is as follows:

[0034] (1) Steelmaking and continuous casting process: smelting in a top-bottom double-blown oxygen converter, the molten steel is then refined in a RH vacuum furnace, and the alloy is added to adjust the composition. The cycle time is 7 minutes, and the composition is homogenized. After refining, the molten steel is sent to Continuous casting is carried out in the continuous casting workshop, the temperature of the tundish is 1560°C, the continuous casting is protected throughout the casting process, and the thickness of the continuous casting slab is 230mm. Sampling test results show that the composition of the slab is: C 0.004%, Mn 0.20%, Si 0.60%, P 0.040%, S 0.007%, and the rest are iron Fe and unavoidable impurity elements;

[0035] (2) Hot continuous rolling slab heating process: heating the slab to 1200°C, and the total h...

Embodiment 3

[0040] A kind of DD750 low-carbon steel cold-rolled strip for electricians of the present embodiment, the manufacturing method is as follows:

[0041] (1) Steelmaking and continuous casting process: smelting in a top-bottom re-blown oxygen converter, the molten steel is then refined in a RH vacuum furnace, and the alloy is added to adjust the composition. The cycle time is 6 minutes, and the composition is homogenized. After refining, the molten steel is sent to Continuous casting is carried out in the continuous casting workshop, the temperature of the tundish is 1563°C, the continuous casting is protected throughout the casting process, and the thickness of the continuous casting slab is 230mm. Sampling test results show that the composition of the slab is: C 0.015%, Mn 0.28%, Si 0.40%, P 0.068%, S 0.004%, and the rest are iron Fe and unavoidable impurity elements;

[0042] (2) Hot continuous rolling slab heating process: heating the slab to 1100°C, and the total hea...

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Abstract

The invention discloses a DD750 cold-rolled low-carbon steel strip for electricians, and a manufacturing method thereof. The DD750 cold-rolled low-carbon steel strip comprises the following chemical components in percentage by weight: no more than 0.015% of C, 0.20-0.45% of Mn, 0.15-0.60% of Si, 0.040-0.100% of P, no more than 0.015% of S, and the balance of Fe and inevitable impurity elements. The manufacturing method comprises the following steps of: steelmaking compositions control: conducting refining treatment to molten steel through an RH vacuum furnace, adding alloy regulation compositions, so as to enable the chemical compositions to achieve the design requirement; hot continuous rolling process, wherein the finishing rolling temperature of the hot continuous rolling is at 800-900 DEG C, the coiling temperature is at 640-740 DEG C; cold continuous rolling process: pickling and rolling, wherein the total reduction rate of the cold rolling can achieve 72.0-86.0%; and continuous annealing process, wherein the annealing temperature is at 750-850 DEG C. The product manufactured by adopting the method is low in cost, can entirely replace low-mark non-oriented electrical steel, and the quality can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of cold-rolled steel strip manufacturing, in particular to a DD750 low-carbon steel cold-rolled steel strip for electricians and a manufacturing method thereof. Background technique [0002] Electrical steel is usually used to make motor and transformer cores. With the development of my country's economy, the market demand for electrical steel is also increasing. According to the grades set in the national standard GB / T 2521-2008 "Cold-rolled Oriented and Non-oriented Electrical Steel Strip (Sheet)", oriented electrical steel is usually used for In the manufacture of large transformers, non-oriented electrical steel is usually used in the manufacture of motors or small and medium-sized transformers. With the continuous improvement of people's living standards, the market demand for small and medium-sized household appliances is increasing day by day. Therefore, the demand for non-oriented electrical steel b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/12
Inventor 冷光荣张留洪邹锦忠张延和吴洪陈建华王振基周建明杨帆刘志芳吴汉华
Owner XINYU IRON & STEEL CO LTD
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