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Easily-weldable tempered high-strength ductile steel plate used in hydroelectric projects and production method thereof

A hydropower engineering, high-strength and toughness technology, applied in the field of steel smelting, can solve the problems of poor low-temperature toughness and inability to meet the needs of hydropower engineering, and achieve the effects of no cold bending cracks, good weldability, and low carbon equivalent

Inactive Publication Date: 2012-09-19
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-temperature toughness of this kind of steel plate is relatively poor, which cannot meet the use in complex environments of hydropower projects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The easy-to-weld quenched and tempered high-strength toughness steel plate for hydropower engineering in this embodiment has a thickness of 112 mm and is formed by melting the following components by weight percentage: C: 0.14%, Si: 0.25%, Mn: 1.29%, P: 0.009%, S: 0.001%, Al: 0.040%, Nb: 0.023%, V: 0.039%, Ni: 0.50%, Cr: 0.43%, Mo: 0.40%, Ti: 0.020%, the balance is Fe and trace unavoidable impurities .

[0032] The production method of the easy-to-weld quenched and tempered high-strength toughness steel plate for hydropower engineering of the present embodiment has the following steps:

[0033] (1) Smelting: will contain the following weight percentages C: 0.14%, Si: 0.25%, Mn: 1.29%, P: 0.009%, S: 0.001%, Al: 0.040%, Nb: 0.023%, V: 0.039%, Ni: 0.50%, Cr: 0.43%, Mo: 0.40%, Ti: 0.020% molten steel is first smelted in an electric furnace, then sent to an LF refining furnace for refining, and when the temperature of the molten steel reaches or exceeds 1650°C, it is transf...

Embodiment 2

[0041] The easy-to-weld quenched and tempered high-strength toughness steel plate for hydropower engineering in this embodiment has a thickness of 88.9 mm and is smelted from the following components by weight percentage: C: 0.14%, Si: 0.21%, Mn: 1.19%, P: 0.005% , S: 0.001%, Al: 0.035%, Nb: 0.023%, V: 0.043%, Ni: 0.46%, Cr: 0.47%, Mo: 0.37%, Ti: 0.022%, the balance is Fe and traces are inevitable Impurities.

[0042] The production method of the easy-to-weld quenched and tempered high-strength toughness steel plate for hydropower engineering of the present embodiment has the following steps:

[0043] (1) Smelting: will contain the following weight percentages C: 0.14%, Si: 0.21%, Mn: 1.19%, P: 0.005%, S: 0.001%, Al: 0.035%, Nb: 0.023%, V: 0.043%, Ni: 0.46%, Cr: 0.47%, Mo: 0.37%, Ti: 0.022% molten steel is first smelted by electric furnace, then sent to LF refining furnace for refining, and when the temperature of molten steel reaches or exceeds 1640°C, it is transferred to V...

Embodiment 3

[0051] The easy-to-weld quenched and tempered high-strength toughness steel plate for hydropower engineering in this embodiment has a thickness of 66mm and is formed by melting the following components by weight percentage: C: 0.13%, Si: 0.25%, Mn: 1.10%, P: 0.008%, S: 0.002%, Al: 0.040%, Nb: 0.021%, V: 0.042%, Ni: 0.48%, Cr: 0.46%, Mo: 0.36%, Ti: 0.022%, the balance is Fe and trace unavoidable impurities .

[0052] The production method of the easy-to-weld quenched and tempered high-strength toughness steel plate for hydropower engineering of the present embodiment has the following steps:

[0053] (1) Smelting: will contain the following weight percentages C: 0.13%, Si: 0.25%, Mn: 1.10%, P: 0.008%, S: 0.002%, Al: 0.040%, Nb: 0.021%, V: 0.042%, Ni: 0.48%, Cr: 0.46%, Mo: 0.36%, Ti: 0.022% molten steel is first smelted by electric furnace, then sent to LF refining furnace for refining, and when the temperature of molten steel reaches or exceeds 1645°C, it is transferred to VD ...

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Abstract

The invention discloses an easily-weldable tempered high-strength ductile steel plate used in hydroelectric projects, and further relates to a production method of the steel plate. The easily-weldable tempered high-strength ductile steel plate used in hydroelectric projects comprises the following chemical ingredients in percentage by weight: 0.11-0.14% of carbon, 0.15-0.25% of silicon, 1.05-1.45% of manganese, not more than 0.010% of phosphorus, not more than 0.005% of sulfur, 0.40-0.50% of nickel, 0.40-0.50% of chromium, 0.35-0.40% of molybdenum, 0.02-0.04% of niobium, 0.030-0.050% of vanadium, 0.015-0.025% of titanium, 0.020-0.040% of aluminum, and the balance of iron and trace inevitable impurities. The production method of the steel plate comprises the steps of electrosmelting, F / VD refining, continuous casting, steel billet heating, rolling, thermal stacking, and heat treatment to obtain a finished product. The easily-weldable tempered high-strength ductile steel plate used in hydroelectric projects, disclosed by the invention, has a maximum thickness of 120mm, and has the characteristics of low cost, high strength, good low-temperature impact ductility, and good ductility, cold bending property and weldability.

Description

technical field [0001] The invention belongs to the technical field of steel smelting, and in particular relates to an easy-weld quenched and tempered high-strength toughness steel plate for hydropower engineering and a production method thereof. Background technique [0002] With the improvement of China's modernization level, the continuous development of social economy and the continuous improvement of people's living standards, clean and green hydropower projects have broad prospects for development. At present, the degree of hydropower development is still low, with a development rate of less than 17%, and the market development has great potential. At the same time, it will drive domestic equipment manufacturing, materials, metallurgy and other industries to achieve long-term development. Due to the complex service environment of hydropower engineering, it has extremely high requirements on various technical indicators of steel, not only high strength and toughness, b...

Claims

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Application Information

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IPC IPC(8): C22C38/50C21D1/25
Inventor 赵文忠叶建军张海军王九清刘印子张志军张彦召张东方
Owner WUYANG IRON & STEEL
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