High performance corrosion-proof rare earth super strength dual-phase stainless steel and its smelting tech.

Abstract

The present invention relates to one kind of Fe-base RE-adding high performance anticorrosive high strength two phase stainless steel and its smelting process. The stainless steel has proper amount of RE added for modifying and micro alloying, N to replace Ni, properly regulated Cr, Ni, Cu, Mo, Si, Mn and other alloy elements, and added W to raise performance. During smelting, composite active metal elements Re, Mg and Ca are used in treating molten steel; and in electroslag remelting, the RE steel electrode is remelted in a five-component slag system comprising ReO2, MgO, CaO, CaF2 and Al2O3 in the weight ratio of 10 to 10 to 10 to 50 to 20 to result in new material with obviously raised mechanical strength, and improved heat working performance, heat resisting performance and hydrochloric acid corrosion resisting performance. The present invention is suitable for making anticorrosive apparatus for petrochemical, papermaking and other industry.

Description

technical field [0001] The invention relates to an iron-based alloy, in particular to an iron-based and rare-earth-added high-performance, corrosion-resistant, rare-earth super-duplex stainless steel and a smelting process thereof. Background technique [0002] In recent years, with the development of our country's national economy, the demand for stainless steel with various corrosion resistance is increasing day by day, especially the rapid development of offshore oil fields, gas wells, chemical industry, shipbuilding, gunpowder, atomic energy, natural gas and gas pipeline industries has caused material use conditions The diversification and harshness of the corrosive environment. Uniform corrosion, pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion and hydrogen embrittlement accidents of various environmental media continue to occur, bringing huge losses to the national economy. According to the survey of industrially developed countries, the...

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Problems solved by technology

[0007] The purpose of the present invention is to avoid the defects of the prior art and provide a high-performance corrosion-resistant rare earth super-strong duplex with high strength, high corrosion resistance, excellent thermal processing performance, low price, high recovery rate of rare earth, and better refining effect. Stainless steel and its smelting process realize timely and appropriate use of active metals to treat molten steel, which can not only increase the overall recovery rate of beneficial trace elements in the composite treatment process, but also avoid the formation of large inclusions; During slag remelting, it cannot effectively protect the beneficial trace elements such as Re, Mg, Ca in the electrode rod and lead to the problem of aluminum increase in electroslag steel, thereby further improving the performance of the steel