Cr-Ni-Mn-series non-magnetic stainless steel and preparation method thereof

Abstract

The invention discloses Cr-Ni-Mn-series non-magnetic stainless steel. The Cr-Ni-Mn-series non-magnetic stainless steel is prepared from the components in percentage by mass: greater than or equal to 0.04% and less than or equal to 0.06% of C, greater than or equal to 18.5% and less than or equal to 19.5% of Cr, greater than or equal to 12.0% and less than or equal to 14.0% of Ni, less than or equal to 1.0% of Mn, greater than or equal to 0.15% and less than or equal to 0.25% of N and the balance of Fe and inevitable impurities. The invention further discloses a preparation method of the Cr-Ni-Mn-series non-magnetic stainless steel.

Description

technical field [0001] The invention relates to the technical field of stainless steel materials, in particular to a Cr-Ni-Mn series non-magnetic stainless steel and a preparation method thereof. Background technique [0002] Non-magnetic steel refers to steel that does not produce magnetic induction in a magnetic field, its structure is mainly austenite, and its magnetic permeability μ≤1.29×10 -6 H / m, relative permeability μr≤1.05. Non-magnetic steel is widely used, and it is required in automatic control systems, precision instruments, telecommunications, motors and many military fields. With the progress of society and the development of economy, the demand for high performance non-magnetic steel is increasing day by day. [0003] Common austenitic stainless steels, such as models 304, 316, etc., have austenite structure in solid solution state, and the relative magnetic permeability is lower than 1.05, which belongs to the non-magnetic category. However, after a certai...

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Problems solved by technology

[0003] Common austenitic stainless steels, such as models 304, 316, etc., have austenite structure in solid solution state, and the relative magnetic permeability is lower than 1.05, which belongs to the non-magnetic category. However, after a certain amount of cold deformation processing, Austenitic stainless steel is prone to deformation, which induces martensitic transformation

As the cold deformation rate increases, the relative magnetic permeability will be greatly improved. Therefore, after austenitic stainless steel is processed into parts or products, it will be more or less magnetic, which cannot be applied in some fields that require non-magnetic

[0004] In the related art, in the non-magnetic stainless steel with relatively stable austenite structure, in order to ensure the stability of austenite and the stainless performance, a sufficient amount of Ni and Mn (or C) elements are generally added to the non-magnetic stainless steel, However, if the Ni element content is high, the production cost will be too high, and if the C or Mn element content is high, it will easily cause corrosion resistance to decline.

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