Hardened martensitic steel having a low or zero content of cobalt, process for manufacturing a part from this steel, and part thus obtained

A technology of martensite and components, which is applied in the direction of manufacturing tools, aircraft parts, arrangement/installation of power devices, etc.

Active Publication Date: 2010-08-25
AUBERT & DUVAL FR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, this steel still contains relatively significant amounts of cobalt

Method used

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Embodiment Construction

[0064] It will be appreciated that the invention is firstly based on a steel composition that differs from the prior art constituted by WO-A-2006 / 114499, in particular that the Co content is very low, not exceeding 1%, and that it can generally be limited to undesired production processes. Trace levels to avoid. The levels of the other most common alloying elements that are significantly present are only slightly modified, but the levels of some impurities must be carefully controlled.

[0065] It is a particularly surprising result that the usual addition of cobalt can be completely dispensed in martensitic steels of the type described in the present invention. Consequently, the steel according to the invention no longer contains significant amounts of valuable additive elements (except for nickel, however whose content is not increased compared to the prior art). Special care is only required during production to limit the nitrogen content to a maximum of 20 ppm in order to...

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Abstract

Steel characterized in that its composition is, in percentages by weight: - C = 0.20 - 0.30%; - Co = traces - 1%; - Cr = 2 - 5%; - Al = 1 - 2%; - Mo + W / 2 = 1 - 4%; - V = traces - 0.3%; - Nb = traces - 0.1%; - B = traces - 30 ppm; - Ni = 11 - 16% with Ni = 7 + 3.5 Al; - Si = traces - 1.0%; - Mn = traces - 2.0%; - Ca = traces - 20 ppm; - rare earths = traces - 100 ppm; - when N < 10 ppm, Ti + Zr / 2 = traces - 100 ppm with Ti + Zr / 2 < 10 N; - when 10 ppm < N < 20 ppm, Ti + Zr / 2 = traces - 150 ppm; - O = traces - 50 ppm; - N = traces - 20 ppm; - S = traces - 20 ppm; - Cu = traces - 1%; - P = traces - 200 ppm, the remainder being iron and inevitable impurities resulting from the smelting. Process for manufacturing a part from this steel, and part thus obtained.

Description

technical field [0001] The present invention relates to martensitic steels which are hardened by a duplex system, that is, which are hardened by the precipitation of intermetallic compounds and carbides obtained from suitable steel composition and aging heat treatment operations. Background technique [0002] The steel provides: [0003] - very high mechanical strength, but at the same time also provide high toughness and ductility, i.e. low susceptibility to brittle fracture; this very high strength is also maintained in the hot state (temperatures up to the order of 400°C), [0004] - Good fatigue properties, in particular that it does not contain harmful inclusions, such as nitrides and oxides; this property must be obtained by suitable composition and careful production conditions of the liquid metal. [0005] Furthermore, it is case-hardenable, nitritable or carbonitribable in order to be able to harden its surface so that the surface has high wear resistance during lu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D6/02C21D6/04C22C38/44C22C38/50C22C38/52F16D3/00F16H3/00B64C25/02B64D27/00
CPCC21D6/02C22C38/50C21D6/04C22C38/52C22C38/44C21D1/58C21D6/004
Inventor 雅克·蒙塔尼翁
Owner AUBERT & DUVAL FR
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