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Maraging steel and maraging steel for metallic belt

A maraging steel and metal strip technology, applied in the field of maraging steel, can solve the problems of reduced fatigue strength and weldability, and achieve the effect of large compressive residual stress and long fatigue life

Active Publication Date: 2010-03-31
HITACHI METALS LTD
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  • Abstract
  • Description
  • Claims
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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

Method used

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  • Maraging steel and maraging steel for metallic belt
  • Maraging steel and maraging steel for metallic belt
  • Maraging steel and maraging steel for metallic belt

Examples

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Embodiment

[0071] The present invention is illustrated in more detail by the following examples.

[0072] The maraging steel of the present invention and the comparative steel were melted in a vacuum induction melting furnace to produce a 10 kg ingot, which was subjected to homogenization annealing and then hot forged. Then hot rolling and cold rolling are used to make steel strips with a thickness of about 0.3mm, which become maraging steel for metal strips. Thereafter, solution treatment is performed at 820°C to 900°C, aging treatment is performed at 490°C, and soft nitriding is performed at 450°C to 470°C with a nitriding depth of 20 µm to 40 µm.

[0073] In addition, the solution treatment is performed in a hydrogen atmosphere. The electron micrograph of the 0.3mm thick steel strip surface of the present invention No.6 and No.15 is shown in figure 1 with figure 2 middle. figure 1 It is a maraging steel to which Al is positively added, and the surface is somewhat rough, but since...

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Abstract

A maraging steel for metallic belts which has a composition capable of being reduced in the content of TiN, which serves as a starting point for fatigue failure in a high-cycle-rate region. The composition facilitates nitriding to heighten the surface hardness. The steel has a nitrided surface layer having increased compressive residual stress and hence improved flexural fatigue strength. In the steel, former austenite crystal grains have been reduced in size in order to secure higher strength and higher ductility. The maraging steel contains, in terms of mass%, up to 0.01% C, up to 0.1% Si, up to 0.1% Mn, up to 0.01% P, up to 0.005% S, 17.0-22.0% Ni, 0.1-4.0% Cr, 3.0-7.0% Mo, 7.0-20.0%, excluding 7.0%, Co, up to 0.1% Ti, up to 2.5% Al, up to 0.03% N, up to 0.005% O, and up to 0.01% B (excluding 0), provided that Co / 3+Mo+4Al is 8.0-15.0%, with the remainder being Fe and incidental impurities.

Description

technical field [0001] 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 [0002] 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. Among its typical compositions, 18%Ni-8%Co-5%Mo-0.4%Ti-0.1%Al-bal.Fe can be cited. [0003] 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 are precipitated to obtain high-strength steel. In addition, especially in steel strips used in continuously variable transmission parts of automobile engines, the fatigue strength in the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/54
CPCC22C38/54C22C38/50C22C38/002C22C38/004C22C38/06C22C38/44C22C38/52C22C38/001
Inventor 大石胜彦上原利弘
Owner HITACHI METALS LTD
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