Age hardening austenitic stainless steel and preparation method thereof

Abstract

The invention discloses age hardening austenitic stainless steel. The stainless steel comprises the following components of, in percentage by weight, 0.04%-0.12% of carbon, 0.8%-1.6% of silicon, 1.5%-2.5% of manganese, 18.0%-23.0% of chrome, 8.0%-12.0% of nickel, 0.5%-1.5% of molybdenum, less than or equal to 0.50% of copper, 0.15%-0.25% of nitrogen, less than or equal to 0.80% of niobium, less than or equal to 0.80% of cobalt, larger than or equal to 0.3% and less than or equal to 1.0% of niobium and cobalt, and the balance iron and inevitable impurities. The invention further discloses a preparation method of the stainless steel. An austenitic stainless steel hard-state wire rod with high strength, no magnetism and good corrosion resistance is obtained through chemical component design and manufacturing process control, the method can be used for processing and manufacturing of wire rods such as high-performance stainless steel springs, the tensile strength of the wire rods reaches more than 1600 MPa, and the PREN value is larger than or equal to 23 or more.

Description

technical field [0001] The invention relates to stainless steel, more specifically to an age-hardening austenitic stainless steel and a preparation method thereof. Background technique [0002] Hard materials such as stainless steel springs are widely used in electronics, home appliances, industrial and civil products, and their use state is generally cold-worked, which is higher in strength and hardness than the same material after heat treatment (solution treatment or annealing treatment, etc.), so Suitable for applications requiring high strength and hardness. [0003] 300-series stainless steels such as 301, 302, and 304 are commonly used for hard materials such as stainless steel springs. This type of stainless steel has good comprehensive performance, mature production technology, and is widely used. The 301, 302 and 304 after solid solution have good plasticity and toughness and are non-magnetic, but a large amount of martensite will be produced after cold deformatio...

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Problems solved by technology

[0005] The application number is 201280065481.3, which relates to the composition control and manufacturing process of a metastable austenitic stainless steel that can be used as high-strength spring steel. N, Cr of 15-18, Ni of 6-8, Si exceeding 1.0% to 1.5%, Mo of 0.5-0.9, Mn of 0.4-1.2, Cu of 1.5% or less, the rest contains Fe and other unavoidable impurities, and the temperature of Md30 satisfies the range of 25-30°C, through the solid solution strengthening of the δ ferrite phase, the tensile strength is above 2200Mpa and the hardness is above 570Hv at 80% cold rolling reduction, but the patented stainless steel Corrosion resistance is poor and cold deformation is magnetic

[0006] JP2014513854 discloses a high-strength non-magnetic austenitic stainless steel material with high elastic limit stress and excellent toughness, its composition and weight percentage are: C: ≤0.12%, Si: 0.30-3.0%, Mn: 2.0-9.0% , Ni: 7.0-15.0%, Cr: 11.0-20.0%, N: ≤0.30%, and at least one of ≤3.0% Mo or ≤1.0% V or ≤1.0% Nb or ≤1.0% Ti, B: -1 / 2 Above 0.40 (where d (μm) represents the average grain size of austenite), the magnetic permeability μ is lower than 1.0100 when the cold deformation is above 50%, but the corrosion resistance of the stainless steel is low and the cost is high

[0007] JP20110042775 invented a non-magnetic austenitic stainless steel with high strength and high yield point, its composition and weight percentage are: 0.005-0.08% C, 0.15-1.00% Si, 0.30-2.00% Mn, ≤0.035% Si P, ≤0.015% S, 0.005-0.040% sol.Al, 8.00-10.50% Ni, 18.00-20.00% Cr, 0-4.0% Cu, the rest are Fe and unavoidable impurities, which can be applied to A mold material with a magnetic permeability of less than 1.02 and a Vickers hardness of 250-500 is required, but the strength and corrosion resistance of the patented stainless steel are still low

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