Martensitic stainless steel and method for manufacturing same

Details Martensitic stainless steel and method for manufacturing same Martensitic stainless steel and method for manufacturing same

C - Chemistry, Metallurgy

22

C

C22C 38/40 (2006.01) C21D 1/84 (2006.01) C21D 6/00 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01)

Patent

CA 2463783

A martensitic stainless steel provided includes C: 0.01 - 0.1% and Cr: 9 - 15%, and the retained austenite phase has a thickness not more than 100 nm in such a manner that the X-ray integral intensities of 111.gamma. and 110.alpha. satisfy the formula (a): 0.005 <= 111.gamma./(111.gamma. + 110.alpha.) <= 0.05 Such a metal structure can be obtained by the following procedure: the steel is heated at a temperature of the Ac3 point or more, and then cooled from 800 ~C to 400 ~C at a cooling rate of not less than 0.08 ~C/sec and further cooled down to 150 ~C at a cooling rate of not more than 1 ~C/sec. The martensitic stainless steel according to the present invention has a relatively high carbon content and a greater toughness in spite of a high mechanical strength, and further exhibits an excellent corrosion resistance, so that it is particularly effective as the material for constructing a deep oil well.

L'invention concerne de l'acier inoxydable martensitique contenant de 0,01 à 0,1 % de C et de 9 à 15 % de Cr, et dont la phase austénitique retenue présente une épaisseur ne dépassant pas 100 nm de manière que les intensités intégrales des rayons X de 111.gamma. et 110.alpha. soient conformes à la formule (a): 0,005 <= 111.gamma./(111.gamma. + 110.alpha.) <= 0,05. Une telle structure métallique peut être obtenue par le procédé suivant: l'acier est chauffé à la température du point Ac¿3? ou supérieure, puis refroidi de 800 ·C à 400 ·C à un taux de refroidissement non inférieur à 0,08 ·C/sec, puis refroidi à 150 ·C à un taux de refroidissement ne dépassant pas 1·C. L'acier inoxydable martensitique de la présente invention présente un contenu en carbone relativement élevé et une plus grande ténacité en dépit d'une résistance mécanique élevée, et présente également une excellente résistance à la corrosion, ce qui le rend particulièrement efficace comme matériau de construction d'un puits de pétrole profond.

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