High-strength austenitic stainless steel alloy material and preparation method thereof

Abstract

The invention discloses a high-strength austenitic stainless steel alloy material and a preparation method thereof. The alloy material is prepared from components in percentage by mass as follows: 0.08% of C, 0.02% of S, 0.02% of P, 12.0%-16.0% of Cr, 7.0%-9.0% of Ni, smaller than or equal to 0.5% of Si, 5.0%-7.0% of Mn, 0.5%-1.0% of Cu, 0.5%-0.9% of N, 0.01%-0.1% of rare earth elements, one or more of Nb, Ti and Mo elements and the balance of Fe, wherein the percentage of Nb and Ti is larger than or equal to 0 and smaller than or equal to 2%, and the percentage of Mo is smaller than or equalto 1%. The alloy material is prepared through procedures of smelting, casting, ingot or blank cogging, hot rolling, cold rolling, annealing and acid pickling after rolling and the like. The alloy material has excellent mechanical performance, superior deep drawing performance as high as 1,150 MPa, better machining and forming performance, corrosion resistance equivalent to that of SUS316L austenitic stainless steel and the cost far lower than that of SUS316L.

Description

technical field [0001] The invention belongs to the technical field of stainless steel, and in particular relates to a high-strength austenitic stainless steel alloy material and a preparation method thereof. Background technique [0002] Austenitic stainless steel refers to stainless steel with a stable austenite structure at room temperature, and has a face-centered cubic crystal structure. This kind of steel generally contains high nickel, is non-magnetic, has good weldability and corrosion resistance, and is used to make acid-resistant equipment such as equipment linings and pipelines. However, the strength is low, and it is impossible to strengthen it through phase transformation. It can only be strengthened by cold working, but the number of heat treatments must be reduced during cold working to increase the amount of cold deformation in order to improve the tensile strength of austenitic stainless steel. However, after large cold deformation of austenitic stainless s...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the fact that the existing austenitic stainless steel will induce martensitic transformation after large cold deformation, and precipitate a large amount of hard and brittle intermetallic phases. These precipitated phases will reduce the quality of austenitic stainless steel. The ductility and plasticity of the austenitic stainless steel alloy material increases its brittleness, causing considerable difficulties in the popularization and application of austenitic stainless steel. A high-strength austenitic stainless steel alloy material and its preparation method are provided.

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