Martensitic stainless steel and manufacturing method thereof

Abstract

The invention discloses martensitic stainless steel, which has the characteristics of high hardness, high corrosion resistance, excellent processing performance and low production cost and comprises the following components in percentage by mass: 0.22 to 0.30 percent of C, less than 1.0 percent of Si, 1.0 to 2.0 percent of Mn, less than 0.030 percent of P, less than 0.010 percent of S, 12.0 to 15.0 percent of Cr, 0.070 to 0.120 percent of N, 0.02 to 0.15 percent of V, the balance of Fe and inevitable impurities. The invention also discloses a method for manufacturing the martensitic stainless steel. The method does not add any production process, is easy to control and comprises the following steps of: (1) heating billet steel or continuous casting billet at the temperature of between 1,100 and 1,250 DEG C; (2) finishing final rolling at the temperature of over 900 DEG C; (3) annealing at the temperature of between 800 and 900 DEG C; and (4) performing normalizing treatment at the temperature of between 1,000 and 1,200 DEG C.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a martensitic stainless steel and a manufacturing method thereof. Background technique [0002] The steel for stainless steel knives should have high hardness and good corrosion resistance. Compared with other stainless steels, martensitic stainless steel has the advantages of high hardness, strong wear resistance and low manufacturing cost. It is mainly used in the manufacture of knives and scissors hardware. knives. However, the common martensitic stainless steel such as 2-4Cr13 commonly used at present mainly relies on adding carbon elements to the steel to increase the hardness of the steel after heat treatment. However, when more carbon is added, the corrosion resistance of the steel is relatively poor. How to make martensitic stainless steel have high hardness and good corrosion resistance at the same time has always been a problem that has attracted much attention...

AI Technical Summary

Problems solved by technology

However, adding a higher carbon content to the steel will reduce the corrosion resistance of the material; adding molybdenum, copper and other precious metals to the steel can improve the corrosion resistance of the material, but it will increase the cost of raw materials; It can improve the hardness of the material, but the solid solubility of nitrogen in high-temperature ferrite at normal pressure is small, and the amount of its addition is limited. Therefore, relying on nitrogen alone to increase the hardness is also limited

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