High strength nickel base corrosion resistance alloy and manufacturing method thereof

Abstract

The present invention relates to a high strength nickel base corrosion resistance alloy, which has the following components, by mass, 0.06-0.10% of C, less than or equal to 1.0% of Si, less than or equal to 1.50% of Mn, 19.0-23.0% of Cr, less than or equal to 0.035% of P, less than or equal to 0.001% of S, less than or equal to 0.020% of N, 29.0-35.0% of Ni, 0.15-0.6% of Ti, 0.15-0.6% of Al, 0.001-0.005% of Mg, less than or equal to 0.5% of Cu+O, and the balance of Fe and unavoidable impurities. The nickel base corrosion resistance alloy has a fully austenite structure, and forms MgO and/or MgO.Al2O3 particles with a diameter of about 10 nm-1 mum and a number of 30-50/mm<2> in a liquid alloy so as to refine the diameter of the initial solidified grains of the alloy continuous casting billet to about 0.5-1.0 mm. In addition, a vertical continuous casting process is adopted to produce, such that surface cracks of the continuous casting billet are avoided; and the grain size of the final product is controlled to the 3.5-4 level, such that the product has characteristics of excellent mechanical property, excellent high temperature creep resistance, and the like, and is suitable for manufacture of parts of furnace devices, heat exchangers, steam-powered turbines, and the like.

Description

technical field [0001] The invention belongs to the field of nickel-based corrosion-resistant alloys, and mainly relates to the smelting and vertical continuous casting of a nickel-based corrosion-resistant alloy with complete austenitic structure, in particular to a high-strength austenitic nickel-based corrosion-resistant alloy Alloys and methods of making them. Background technique [0002] The 800 series of nickel-based corrosion-resistant alloys entered the market in the 1950s, with the purpose of meeting the needs of heat resistance and corrosion resistance at a relatively low Ni content. Over the past 50 years, these nickel-based corrosion-resistant alloys have been widely used for their high-temperature strength, oxidation resistance, and other high-temperature corrosion resistance properties. Applications include furnace units, oil lines, sumps, heat exchangers, steam power turbines and more. The performance and operational reliability of these devices will direct...

AI Technical Summary

Problems solved by technology

[0009] It can be seen that some nickel-based corrosion-resistant alloys in the prior art cannot fully meet the current use and manufacturing require

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