A kind of superhard austenitic stainless steel and its manufacturing method

Abstract

The invention discloses a super-hard austenitic stainless steel and a preparation method thereof. The super-hard austenitic stainless steel comprises the following chemical components by weight percent: 0.08-0.13% of C, 0.3-1.0% of Si, less than 2.0% and greater than or equal to 0.5% of Mn, 16.5-17.5% of Cr, 6.5-7.5% of Ni, 0.03-0.08% of N, 0.5-0.8% of Mo, greater than or equal to 0.040% of P, greater than or equal to 0.01% of S, Fe and unavoidable impurities; the temperature of Md30 is 30-60 DEG C. By controlling the tempering and cold rolling reduction rate to 35-45%, controlling the rolling speed to less than or equal to 5m / s and the rolling temperature to less than or equal to 30 DEG C, the transformation from the austenite to the deformation martensite is created and the hardness of the material is greatly increased under the same deformation; when the tempering and cold-rolling reduction rate is 35%, the hardness HV is greater than 550 and the anisotropy of the super-hard state steel is reduced.

Description

technical field [0001] The invention relates to a superhard austenitic stainless steel and a manufacturing method thereof. Background technique [0002] At present, there are mainly two types of hard steel production methods: one is to use conventional 304 steel or 301 steel for different passes, that is, deformation of different cold rolling reductions, to obtain hard steel strips with different hardness levels, conventional 304 steel The chemical composition of stainless steel and 301 stainless steel is shown in Table 1; the other is to replace the precious metal Ni with Mn and N alloys, and perform cold rolling with different reductions to obtain non-magnetic hard steels with different hardness levels. However, the hardness HV of all existing hardened steels is less than 550. [0003] Since hard steel is mainly used in industries such as precision electronics and precision machinery, the requirements for fatigue life are increasing day by day. Because the fatigue limit ...

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Problems solved by technology

[0004] In Chinese patent CN101234395A, when the HV reaches 550, the rolling reduction has reached 70%, which is basically close to the limit of the rolling reduction. Even if the reduction is further increased, the increase in hardness is also very limited, and the The plate shape of the steel is not easy to control, and it will also cause serious anisotropy of the strip steel, especially in the compression deformation, the longitudinal yield strength is much lower than the transverse yield strength, and the severe anisotropy leads to defects in the processing deformation

On the other hand, more than 60% of the cold rolling reduction exceeds the material deformation limit, and some surface quality problems (such as figure 1 shown), affecting the use of

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