Electroslag remelting slag material for preparing high silicomanganese nitrogen-containing stainless steel

Abstract

The invention relates to an electroslag remelting slag material for preparing high silicomanganese nitrogen-containing stainless steel. The electroslag remelting slag material is characterized in thatthe slag material comprises components including, by weight, 50-70 parts of CaF2, 8-20 parts of CaO, 5-20 parts of Al2O3, 5-15 parts of MgO, 1-10 parts of SiO2 and 1-8 parts of MnO2. The silicon element and the manganese element in a high silicomanganese nitrogen-containing stainless steel alloy prepared through the slag material are stable and controllable, a matrix structure is stable, harmfulimpurity elements and nonmetal inclusions are reduced, the structure is optimized, the hot working performance of the alloy is greatly improved, the yield is increased, and excellent mechanical performance and corrosion resistance are obtained.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a slag material for electroslag remelting used to prepare high-silicon-manganese-nitrogen-containing stainless steel. Background technique [0002] Adding a certain amount of nitrogen to austenitic stainless steel can properly reduce the nickel content in the steel, stabilize the austenite matrix, and significantly improve the mechanical strength and corrosion resistance of the steel, and manganese is also formed by austenite. element, and it is beneficial to increase the solubility of nitrogen in steel, which can effectively lower the cost of alloy materials. Therefore, most modern austenitic stainless steels contain a certain amount of nitrogen and manganese according to their performance design characteristics. Silicon in stainless steel is a ferrite forming element, which can significantly improve the strength, elastic limit, heat resistance and high temperature strength of ste...

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Problems solved by technology

Chromium-nickel austenitic stainless steel with high silicon, manganese and nitrogen content has good horizontal and vertical strength and toughness matching, wear resistance, corrosion resistance, cavitation resistance and high temperature performance. It has been widely used, but due to the high silicon content, it is easy to precipitate brittle intermetallic phases during solidification, such as σ, which makes the thermoplasticity of the material worse, thereby reducing the yield and increasing the material cost

This is especially obvious in the industrial production process of large ingots (such as diameter ≥ 600mm), which is very unfavorable for the promotion and application of this material

Although electroslag remelting can purify metals and make steel ingots obtain stable and controllable composition, clean and uniform and compact structure, but for high silicon and / or manganese nitrogen-containing stainless steel, due to the high content of silicon and / or manganese, it also contains A certain amount of nitrogen, silicon, manganese, and nitrogen are easily burned out in the electroslag process, making it difficult to control the content

In addition, if the slag system is improperly selected, the slag-gold reaction will occur in the negative direction, which is not conducive to the improvement of purity and the reduction of non-metallic inclusions, but also tends to lead to the deterioration of the thermal processing performance of the material, and the forging is easy to crack, which affects the yield and improves production. cost

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