Martensitic stainless steel composition, method for making amechanical part from said steel and resulting part

A technology of martensitic stainless steel and mechanical parts, which is applied in the field of alloy steel, can solve problems such as unrealizable, and achieve the effects of good tolerance, low sensitivity and good resistance

Active Publication Date: 2008-08-20
AUBERT & DUVAL FR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] However, none of these currently known maraging stainless steels can achieve the level of mechanical strength

Method used

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  • Martensitic stainless steel composition, method for making amechanical part from said steel and resulting part

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[0072] The present invention can be better understood by reading the following description.

[0073] Steel with extremely high strength is very sensitive to stress corrosion. The composition of the steel according to the present invention makes it possible to avoid the actual origin of stress corrosion cracking in the atmosphere by virtue of the generally improved corrosion resistance. The cause is that the corrosion mechanism generates hydrogen and the internal diffusion of the hydrogen leads to embrittlement of the metal. . For this reason, the content of chromium and molybdenum are respectively at least 9% and 1.5%, preferably at least 10% and 2%, in this way a pitting index IP of at least 16.5 is obtained in the latter case (the pitting index of Defined as IP=Cr+3.3Mo), as the pitting index of AISI 304 austenitic stainless steel under 16-18% Cr. This is because a minimum chromium content of 9-11% is necessary in order to give steel the ability to resist corrosion in a humid at...

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Abstract

The invention concerns martensitic stainless steel, characterized in that its composition in weight percentages is as follows: 9 % = Cr = 13 %; 1.5 % = Mo = 3 %; 8 % = Ni = 14 %; 1 % = Al = 2 %; 0.5 % = Ti = 1.5 % with AI + Ti = 2.25 %; traces = Co = 2 %; traces = W = 1 % with Mo + (W/2) = 3 %; traces = P = 0.02 %; traces = S = 0.0050 %; traces = N = 0.0060 %; traces = C = 0.025 %; traces = Cu = 0.5 %; traces = Mn = 3 %; traces = Si = 0.25 %; traces = O = 0.0050 %; and is such that: Ms ( DEG C) = 1302 42 Cr 63 Ni 30 Mo + 20AI - 15W - 33Mn - 28Si - 30Cu - 13Co + 10 Ti = 50Cr eq / Ni eq = 1 .05 with Cr eq (%) = Cr + 2Si + Mo + 1.5 Ti + 5.5 AI + 0.6W Ni eq (%) = 2Ni + 0.5 Mn + 3O C + 25 N + Co + 0.3 Cu. The invention also concerns a method for making a mechanical part using said steel, and the resulting part.

Description

technical field [0001] The present invention relates to martensitic stainless steels, and in particular to alloy steels mainly comprising the elements chromium, nickel, molybdenum and / or tungsten, titanium, aluminum and possibly manganese and intended to achieve a unique combination of increased corrosion resistance and mechanical strength . Background technique [0002] For some important applications, where the mechanical parts made of steel are subjected to very high stress and the quality of these parts is the main factor for this application, for example in aviation (landing gear box) or spaceflight, the horse can be used Austenitic steel which has very high mechanical strength and additionally offers good toughness K as measured by the snap test 1C . [0003] Quenched and tempered (revenu) lightly alloyed martensitic carbon steels (in other words, none of the alloying elements in the steel exceeds 5% by mass) at working temperatures kept below their tempering tempera...

Claims

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Application Information

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IPC IPC(8): C22C38/44C21D1/25C21D6/00C21D6/04
CPCC21D6/02C22C38/50C21D2211/008C21D9/32C22C38/06C21D1/25C22C38/02C22C38/44C21D6/04C21D2211/004C21D6/004
Inventor J·蒙塔尼翁
Owner AUBERT & DUVAL FR
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