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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, none of these currently known maraging stainless steels can achieve the level of mechanical strength offered by chromium-free maraging steels and lightly alloyed steels, namely 1900 MPa and greater tensile strength R m

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

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Embodiment Construction

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

[0073] Steels with extremely high strength are very sensitive to stress corrosion. The composition of the steel according to the invention makes it possible, by virtue of the generally increased corrosion resistance, to avoid the actual origin of stress corrosion cracking in atmospheric environments, which is the generation of hydrogen by the corrosion mechanism and the internal diffusion of this hydrogen leading to embrittlement of the metal . For this, the chromium and molybdenum contents are respectively at least 9% and 1.5%, preferably at least 10% and 2%, in this way a pitting index I.P. of at least 16.5 is obtained in the latter case (the Defined as I.P.=Cr+3.3Mo), as the pitting index of AISI 304 type austenitic stainless steel at 16-18% Cr. This is because a minimum chromium content of 9-11% is necessary in order to give steel resistance to corrosion in a humid atmosphere by...

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PUM

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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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