Method to reduce silicon in x12crmowvnbn10-1-1

Abstract

The invention relates to the field of reducing the Si content in steel materials, in particular to a method for reducing Si in X12CrMoWVNbN10-1-1. Compared with the prior art, the consumption of return materials can be improved, oxidized scrap iron is adopted as a reducing agent, the production cost is reduced, and the Si content is reduced by adopting five-element electroslag remelting. The levelof the Si content in X12CrMoWVNbN10-1-1 is reduced to 0.02%-0.04%. By optimizing the purity of X12CrMoWVNbN10-1-1, the mechanical property is improved. According to the prepared X12CrMoWVNbN10-1-1 blade steel, the compressive strength can reach 968-980MPa, the yield strength can reach 768-787MPa, the elongation can reach 31-35%, and the percentage reduction of area can each 72%-74%.

Description

technical field [0001] The invention relates to the field of reducing Si content in steel, in particular to a method for reducing Si in X12CrMoWVNbN10-1-1. Background technique [0002] X12CrMoWVNbN10-1-1 is a commonly used blade steel for steam turbines; with the development of steam turbine manufacturing technology, the materials used for blades of ultra-supercritical generator sets for steam turbine blades also need to face more severe environments and better performance ; But only the steam turbine blade steel with high purity can obtain excellent mechanical properties. [0003] Existing technology studies have found that the quality of blade steel can be effectively optimized by reducing the content of Si; however, the effect of low silicon in blade steel is generally carried out by optimizing raw materials or optimizing the process, and choosing raw materials with higher purity means preparing The cost is higher, and the benefits are weak and difficult to sustain; in ...

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Problems solved by technology

[0003] Existing technology studies have found that the quality of blade steel can be effectively optimized by reducing the content of Si; however, the effect of low silicon in blade steel is generally carried out by optimizing raw materials or optimizing the process, and choosing raw materials with higher purity means preparing The cost is higher, and the benefits are weak and difficult to sustain; in order to control the cost, the industry usually uses return steel as raw material for preparation, and controls the excessive Si in the return material through electroslag remelting; but due to technical limitations, in the preparation of X12CrMoWVNbN10- For 1-1 blade steel, the maximum amount of recycled materials generally accounts for 30wt% to 40wt% of the total raw materials; and the effect of reducing Si is not ideal, and the Si content can generally be controlled at ≤0.1wt%; With the development of supercritical and ultra-supercritical units, the steam temperature and working pressure are increasing rapidly. Therefore, it is urgent to provide a X12CrMoWVNbN10-1-1 blade steel with low cost, low Si content, high purity and excellent performance.

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