Stanniferous martensitic stainless steel with excellent performance and manufacturing method thereof

Abstract

The invention discloses stanniferous martensitic stainless steel with excellent performance and a manufacturing method thereof. The steel comprises the following chemical components in percentage by weight: 0.15-0.40% of C, less than or equal to 1.0% of Si, less than or equal to 2.0% of Mn, less than or equal to 0.04% of P, less than or equal to 0.010% of S, 12.0-14.0% of Cr, 0.05-0.12% of N, 0.10-0.30% of Sn, and the balance of Fe and inevitable impurities. Tinned waste steel is added to control the content of Sn and then stanniferous martensitic stainless steel with excellent performance is melted. After being quenched at 1050 DEG C, the stanniferous martensitic stainless steel has the advantages that tensile strength of the steel is greater than or equal to 1500MPa, the Rockwell hardness is greater than or equal to 48HRC and the pitting potential is greater than or equal to 105mV. The steel has high strength and hardness as well as excellent corrosion resistance, and is suitable for manufacturing top-grade cutters, measuring implements and other parts requiring high hardness and corrosion resistance.

Description

technical field [0001] The invention relates to the field of metallurgical materials, in particular to a tin-containing martensitic stainless steel with excellent performance and a manufacturing method thereof; the tensile strength of the tin-containing martensitic stainless steel after quenching at 1050°C is ≥1500MPa, and the Rockwell hardness is ≥48HRC , pitting potential ≥ 105mV. Background technique [0002] Martensitic stainless steel is a kind of stainless steel whose microstructure and properties can be changed by different heat treatment processes. Typical steel types are 20Cr13, 30Cr13, etc., which are mainly used to manufacture various knives, scissors, measuring tools, etc., most of which require high strength ( Generally, the tensile strength is ≥1500MPa), the hardness is above 48HRC, and a certain corrosion resistance is required. After annealing, their main structure is ferrite + carbide, which has low strength, hardness and good plasticity; after high-tempera...

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Problems solved by technology

[0007] It can be seen that in the development process of martensitic stainless steel, people have begun to notice that the corrosion resistance can be improved to a certain extent by reducing carbon and increasing nitrogen, but further improving corrosion resistance can only be achieved by adding precious metals such as molybdenum and copper. Realized that a small amount of cheap tin has not been used to improve performance, nor has carbon reduction, nitrogen addition and tin addition been comprehensively applied to martensitic stainless steel for knives, scissors and measuring tools

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