Nickel-saving rare-earth/barium-containing biphase stainless steel alloy material and preparation method thereof

Abstract

The invention relates to a nickel-saving rare-earth / barium-containing biphase stainless steel alloy material and a preparation method thereof. The alloy material is composed of the following components in percentage by mass: at most 0.025% of C, at most 0.005% of O, at most 0.006% of S, at most 2.00% of Si, at most 0.025% of P, 2.00-5.00% of Mn, 17.0-21.0% of Cr, 1.0-2.5% of Ni, 0.1-2.0% of W, 0.1-1.0% of Cu, 2.0-5.5% of Mo, 0.2-0.40% of N, 0.001-0.01% of B, 0.0005-0.01% of Ba, 0.01-0.2% of lanthanum-cerium mixed rare earth RE and the balance of Fe. The preparation method comprises the following steps: smelting, casting, cast ingot or casting blank cogging, hot rolling and solution treatment. The method has the advantages of nickel saving and low production cost, obviously enhances the mechanical strength, and improves the hot working properties, corrosion resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of duplex stainless steel, in particular to a nickel-saving rare earth-containing and barium duplex stainless steel alloy material and a preparation method thereof. Background technique [0002] Duplex stainless steel is composed of ferrite phase and austenite phase, which combines the advantages of single-phase ferrite and single-phase austenite, and has good mechanical properties, good toughness and excellent corrosion resistance. It has been widely used in petroleum and chemical industry. However, the use of domestic duplex stainless steel still has certain limitations. For example, we don’t have much experience in several large fields such as pulp and paper industry, oil and gas industry, transportation industry, and even construction industry that use duplex stainless steel in large quantities abroad. Some are just getting started. [0003] Some chemical companies in China's existing industries, such ...

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Problems solved by technology

The production and use of these alloys will undoubtedly consume a large amount of expensive nickel, which will not only increase production costs, but also go against the general trend of "energy saving and emission reduction", and their application will inevitably be strictly restricted

[0004] In these chemical production corrosive environments, if alloys with low nickel content and relatively cheap prices are selected, such as the most common austenitic stainless steel SUS304 (Cr18Ni8), it is sometimes difficult to meet high temperature and more severe corrosion conditions.

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