Nuclear power steel 18mnnimo and its preparation method

A technology of nuclear power, chemical composition, applied in the direction of electric furnace, furnace type, furnace, etc.

Active Publication Date: 2011-11-30
浙江伟晟控股有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ordinary electric arc furnace steelmaking process can no longer meet these requirements

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  • Nuclear power steel 18mnnimo and its preparation method

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Embodiment Construction

[0024] The present invention claims the preparation method of nuclear power steel 18MnNiMo, which is characterized in that it includes the following smelting steps of high temperature treatment technology in sequence: electric arc furnace smelting EF, ladle refining outside the furnace LF, vacuum degassing refining VD, and vacuum pouring. Specifically include the following steps:

[0025] (1) Furnace repair (mainly composed of magnesia, 200kg / furnace), feeding materials, blowing oxygen to boost melting after electrification, and performing oxygen blowing decarburization after full melting analysis, so as to achieve uniform boiling at high temperature and automatic slag flow, and the decarburization amount is greater than 0.30 %;

[0026] (2) Then carry out midway analysis and slag analysis, both of which are stirred to analyze C, P and the required elements; when the concentration of C in the analysis is -0.03% of the lower limit of the concentration standard required for the ...

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Abstract

A nuclear power steel comprises the following chemical components of: by weight, 0.16-0.20% of C, 0.10-0.30% of Si, 1.35-1.50% of Mn, Cr being less than or equal to 0.15%, P being less than or equal to 0.006%, S being less than or equal to 0.005%, 0.65-0.80% of Ni, 0.45-0.55% of Mo, V being less than or equal to 0.02%, Cu being less than or equal to 0.08%, Co being less than or equal to 0.03%, Albeing less than or equal to 0.04%, As being less than or equal to 0.015%, Sn being less than or equal to 0.010%, Sb being less than or equal to 0.002%, B being less than or equal to 0.0003%, N being less than or equal to 130PPm, H being less than or equal to 1.5PPm, and the balance being Fe and inevitable impurities. The nuclear power steel provided by the invention is prepared by technologies ofthe electric arc furnace melting EF, out-of-furnace ladle refining LF, vacuum degasification VD, vacuum casting VC and the like, and has good comprehensive mechanical properties as well as cold bending performance.

Description

technical field [0001] The invention belongs to the technical field of high-quality carbon steel, in particular to 18MnNiMo nuclear power steel and a preparation method thereof. Background technique [0002] With the gradual reduction of traditional non-renewable energy sources in the future, countries all over the world attach great importance to the utilization of nuclear energy. The development of nuclear power steels suitable for the third generation nuclear power technology is becoming more and more important. In view of my country's current urgent need for energy strategic reserves, the research and development of high-performance nuclear power thick steel plates with independent intellectual property rights is of great significance for improving my country's energy system, independently developing nuclear energy resources, and ensuring national energy security. [0003] Steel for nuclear power is used in important parts such as cylinders of nuclear power plant pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/54C22C38/52C22C38/46C22C38/44C22C38/16C22C38/12C21C5/52C21C7/10C21C7/076B22D27/15
CPCY02P10/20
Inventor 信东辉缪志刚俞高行
Owner 浙江伟晟控股有限公司
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