Preparation process of cast steel material capable of resisting high temperature of 620 DEG C

Abstract

The invention discloses a preparation process of a cast steel material capable of resisting a high temperature of 620 DEG C. The cast steel material is ZG13Cr9Mo2Co1NiVNbNB; the preparation process comprises a unique electric arc furnace smelting process and a ladle refining furnace smelting process; according to the preparation process, nitrogen is blown in the LF furnace smelting process to take the place of the process of adding a chromium nitride alloy to the electric arc furnace in the prior art, and therefore, the process performance is stabilized and the cost is greatly reduced. The electric arc furnace and the ladle refining furnace are taken as the basic smelting devices for the preparation process; the electric arc furnace smelting process is strengthened, and on the basis of obtaining good-quality primary smelting liquid steel, the control of the ladle refining furnace is refined; a unique, complete and exquisite preparation process is obtained by virtue of lots of experimental summary; the existing production equipment can be utilized without increasing investment to produce steel castings having the performance indices completely satisfying the use of high-efficiency ultra-supercritical units, and the steel castings have been successfully applied to the operation of high-efficiency ultra-supercritical turbine units.

Description

technical field [0001] The invention relates to a preparation process of a cast steel material, in particular to a preparation process of a high temperature resistant cast steel material. Background technique [0002] With people's increasing concern about environmental pollution and the increasing shortage of fossil fuels such as coal, how to further reduce energy consumption and reduce CO 2 Emissions have become an issue that the whole society pays more and more attention to and needs to be solved urgently. Improving the efficiency of coal-fired power plants can achieve the goals of energy saving and emission reduction at the same time, which is the most basic development direction of the power industry. Higher ultra-supercritical steam parameters, unique structure and thermal system optimization are the main measures to improve efficiency. Therefore, ultra-supercritical power generation technology has also received more and more attention from the power industry in variou...

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Problems solved by technology

The chemical composition of this material is very complex and the specifications are strict, and the control in the production process is very difficult. If you rely on imports, it will put a huge pressure on the company's cost

The production and smelting of the same type of materials at home and abroad must be equipped with corresponding vacuum smelting equipment, and the investment in infrastructure is large. Due to the limitations of equipment and venues, it is difficult for factories without conditions to carry out production.

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