Maraging steel and maraging steel used for metal belt

Abstract

The invention provides maraging steel used for a metal belt. The maraging steel can reduce the composition forming the starting point TiN of a fatigue failure in a high-cycle region, and nitrogen treatment is easy to perform to improve surface hardness; moreover, the compressive residual stress of a surface nitride layer is increased to improve the bending fatigue strength; in addition, the maraging steel is also used for the micronization of old austenitic grain which ensures high strength and ductility. The maraging steel is characterized by comprising the following components in percent by mass: less than 0.01 percent of C, less than 0.1 percent of Si, less than 0.1 percent of Mn, less than 0.01 percent of P, less than 0.005 percent of S, 17.0 to 22.0 percent of Ni, 0.1 to 4.0 percent of Cr, 3.0 to 7.0 percent of Mo, greater than 7.0 percent and less than 20.0 percent of Co, less than 0.1 percent of Ti, less than 2.5 percent of Al, less than 0.03 percent of N, less than 0.005 percent of O, less than 0.01 percent (excluding 0 percent) of B, 8.0 to 15.0 percent of Co / 3+Mo+4Al, and the balance Fe and unavoidable impurities.

Description

[0001] This application is a divisional application of application number: 200780053748.6, application date: 2007.07.11, and invention name: "Maraging steel for maraging steel and metal strip". technical field [0002] The present invention relates to a maraging steel having excellent skin fatigue strength, and a maraging steel for a metal belt used in a continuously variable transmission for automobiles. Background technique [0003] Maraging steel generally has a very high tensile strength of about 2000MPa, so it is used for parts requiring high strength, such as rocket engine parts, centrifuge parts, aircraft parts, and continuously variable transmission parts for automobile engines. , metal molds and other uses. Its typical composition includes 18% Ni-8% Co-5% Mo-0.4% Ti-0.1% Al-bal.Fe. [0004] In addition, maraging steel contains appropriate amounts of Co, Mo, and Ti as strengthening elements, and can make Ni 3 Mo, Ni 3 Ti, Fe 2 Intermetallic compounds such as Mo a...

AI Technical Summary

Problems solved by technology

However, since C is actively added to achieve high strength, carbides such as Cr and Mo are precipitated, which become the starting point of fatigue fracture, and the fatigue strength is reduced. In addition, due to the positive addition of C, welding required for components of the continuously variable transmission is required. reduced likelihood of sex

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