Maraging steel

A technology of maraging steel and Vickers hardness, applied in V-shaped belts, coatings, belts/chains/gears, etc., can solve problems such as insufficient strength, and achieve excellent mechanical properties, high fatigue strength properties, high Effect of Strength and Fatigue Strength Properties

Active Publication Date: 2014-05-28
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In response to such a high demand, the strength of the conventional maraging steel of the above-mentioned second method is not necessarily sufficient, and it is required to achieve more excellent fatigue strength and stable high strength

Method used

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Embodiment

[0086] The present invention will be described in more detail using the following examples.

[0087] Seven kinds of steel ingots weighing 10 kg were produced using a vacuum induction melting furnace. In order to more reliably prevent contamination of Ti, Nb, Ta, and W, elements that should be restricted, high-purity alloy raw materials are used as the alloy raw materials to be added.

[0088] Homogenizing annealing was performed on the produced steel ingot, and then hot forging was performed. Then, it is made into maraging steel with a thickness of about 0.2mm by hot rolling and cold rolling, which is used as the maraging steel for the metal endless belt of CVT.

[0089] Table 1 shows the chemical composition and Al / Ti ratio of the obtained maraging steel. The C content in all the maraging steels was adjusted to a range of 0.008% or less, thereby preventing a decrease in weldability. In addition, the Al content of the maraging steels No. 1, No. 2, and No. 7 exceeded the ran...

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Abstract

Provided is a maraging steel with which maraging steel that has been subjected to nitriding treatment has excellent fatigue strength and stable high strength. Maraging steel that has been subjected to nitriding treatment to a thickness of 0.5 mm or less and comprises, by mass%, 0.008% or less of C, 0.5% or less of Si, 0.5% or less of Mn, 0.5 to 1.5% of Cr, 16.0 to 22.0% of Ni, 3.0 to 7.0% of Co, and 3.0 to 7.0% of Mo is a maraging steel further comprising, by mass%, 0.6 to 1.3% of Al and Fe and impurities as the balance, wherein the impurities are maintained at 0.01% or less of Ti, 0.01% or less of Nb, 0.01% or less of Ta, and 0.01% or less of W, the ratio of Al and Ti is Al/Ti>=250, and by Vickers hardness, the surface hardness of the maraging steel is 800 to 1,050 HV and internal hardness of the maraging steel is 570 HV or less.

Description

technical field [0001] The present invention relates to a nitriding-treated maraging steel suitable for, for example, a metal endless belt for a CVT (Continuously Variable Transmission). Background technique [0002] Maraging steel has a very high tensile strength of about 2000 MPa. Therefore, for example, maraging steel can be processed into a steel strip of 0.5 mm or less, and used for metal endless belts requiring high strength in CVTs. [0003] In a typical composition of a maraging steel, 18% of Ni, 8% of Co, 5% of Mo, 0.45% of Ti, 0.1% of Al are contained by mass percentage, and the balance is Fe. [0004] However, although the above-mentioned maraging steel can obtain very high tensile strength, its fatigue strength is not necessarily high. TiN inclusions are cited as the biggest cause of the decrease in the fatigue strength of maraging steel. The size of the TiN inclusions tends to be large, and the shape is also cubic, so fatigue fracture originating from the incl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/52C22C38/54C23C8/26
CPCC21D6/001C22C38/00C22C38/54C22C38/44C22C38/04C22C38/06C23C8/26C22C38/50C22C38/001C22C38/004C22C38/002C22C38/52C22C38/02F16G5/16
Inventor 大石胜彦上原利弘岸上一郎
Owner HITACHI METALS LTD
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