High-corrosion-resistant martensitic stainless steel

Details High-corrosion-resistant martensitic stainless steel High-corrosion-resistant martensitic stainless steel

C - Chemistry, Metallurgy

22

C

C22C 38/40 (2006.01) C22C 38/00 (2006.01) C22C 38/42 (2006.01) C22C 38/46 (2006.01) C22C 38/50 (2006.01)

Patent

CA 2296349

A high-strength and high-toughness martensitic stainless steel, which is excellent in corrosion resistance to carbon dioxide, and which has no risk of cracking, even if used as welded under cathodic protection. The steel has the following basic composition (1) and satisfies the following condition (2). (1) The composition containing, on a mass basis, C: not greater than 0.04%, Cr: 7-15%, Ni: 0.7-8.0%, Al: 0.001-0.20%, or further containing one or more of Si, Mn, Cu, S, Nb, Ti, Zr, Mo, W, Ca, Mg, and La in a specified amount. (2) The following inequalities (1) and (2) are satisfied. M=98+47C-1.1Cr+1.4Ni-150Al-200Nb-50Ti-200Zr-22(Mo+0.5W)~50 .multidot. (1) P~0.046-0.0008HRC .multidot. (2) where the symbols of the elements in the inequalities (1)-1 to (1)-4 and (2) indicate the contents (% by mass) of the respective elements, and HRC in the inequality (2) indicates the Rockwell C-scale hardness of the steel as quenched.

L'invention concerne un acier inoxydable en martensite possédant une haute résistance à la corrosion par dioxyde de carbone, une haute résistance mécanique et une haute ténacité, l'acier ne présentant pas de possibilité de fissuration même lorsqu'il est soudé et muni d'un système de protection cathodique; l'acier présente la composition de base suivante (1) au plus 0,04 % en masse de C, 7 à 15 % en masse de Cr, 0,7 à 8,0 % en masse de Ni, 0,001 à 0,20 % en masse de Al et une quantité spécifiée d'au moins un type d'élément sélectionné dans le groupe formé par Si, Mn, Cu, S, Nb, Ti, Zr, Mo, W, Ca, Mg, et La; et remplit les conditions suivantes (2) M=98+47C-1.1Cr+1.4Ni-150Al-200Nb-50Ti-200Zr-22(Mo+0,5W)>/=50 (1) P</=0,046-0,0008HRC (2) les symboles d'éléments dans les formules (1)-1 à (1)-4 et (2) représentant la teneur (% en masse) des éléments respectifs, et HRC dans la formule (2), la dureté Rockwell de l'acier trempé.

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