Martensitic stainless steel seamless pipe and a...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 9/08 (2006.01) C21D 8/10 (2006.01) C22C 38/18 (2006.01) C22C 38/24 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01) C22C 38/32 (2006.01)

Patent

CA 2491834

The present invention provides a martensitic stainless steel seamless pipe, having no inner surface defect and suppressing a delayed fracture generation in the impact-worked portions, and a method for manufacturing such a seamless steel pipe. A martensitic stainless steel seamless pipe, characterized by consisting of C: 0.15 to 0.22%, Si: 0.1 to 1.0%, Mn: 0.10 to 1.00%, Cr: 12.00 to 14.00%, P: 0.020% or less, S: 0.010% or less, N: 0.05% or less, O(Oxygen): 0.0060% or less, at least one alloying element selected from V, Nb and Ti of 0.005 to 0.200 % and B of 0.0005 to 0.0100 %, and the balance Fe and impurities, satisfying either the following inequalities (1), (2), (4) and (5) or the following inequalities (1), (3), (4) and (5): C* + 10N* <= 0.45, (1) H1 <= -0.003(C* + 10N*) + 0.0016, (2) H2 <= -0.0018(C* + 10N*) + 0.00096, (3) Cr* <= 9.0, (4) S <= 0.088N* + 0.00056, (5).

L'invention concerne un tuyau sans soudure en acier inoxydable martensitique, ne comportant aucun défaut de surface intérieure et empêchant la formation de fissure retardée dans les parties travaillées par choc, ainsi qu'un procédé de fabrication d'un tel tuyau sans soudure. Elle concerne, en particulier, un tuyau sans soudure en acier inoxydable martensitique, caractérisé en ce qu'il contient en C: 0,15 à 0,22 %, en Si: 0,1 à 1,0 %, en Mn: 0,10 à 1,00 %, en Cr: 12,00 à 14,00 %, en P: 0,020 % ou moins, en S: 0,010 % ou moins, en N: 0,05 % ou moins, en O(Oxygène): 0,0060 % ou moins, au moins un élément d'alliage choisi parmi le groupe comprenant V, Nb et Ti pour 0,005 à 0,200 % et B pour 0,0005 à 0,0100 %, le solde étant constitué de Fe et d'impuretés, obéissant aux inégalités (1), (2), (4) et (5) suivantes ou aux inégalités (1), (3), (4) et (5): C* + 10N* = 0.45, (1) H1 = -0,003(C* + 10N*) + 0,0016, (2) H2 = -0,0018(C* + 10N*) + 0,00096, (3) Cr* = 9,0, (4) S = 0,088N* + 0,00056, (5).

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