C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/58 (2006.01) B23K 35/30 (2006.01) C22C 38/00 (2006.01)
Patent
CA 2502207
A high-strength stainless steel, having good mechanical properties and corrosion resistance in a high-pressure hydrogen gas environment, and a container or other device for high-pressure hydrogen gas, which is made of the said steel, are provided. The stainless steel consists of, by mass %, C: not more than 0.04%, Si: not more than 1.0%, Mn: 7 to 30%, Cr: 15 to 22%, Ni: 5 to 20%, V: 0.001 to 1.0%, N: 0.20 to 0.50% and Al: not more than 0.10%, and the balance Fe and impurities. Among the impurities, P is not more than 0.030%, S is not more than 0.005%, and Ti, Zr and Hf are not more than 0.01 % respectively, and the contents of Cr, Mn and N satisfy the relationship, 2.5Cr + 3.4Mn <= 300N. The weld metal of the welded joint of the container or other device made of the said stainless steel is characterized by satisfying the relationship, -11 <= Nieq - 1.1 × Creq <= 8.
La présente invention concerne un acier inoxydable à haute résistance mécanique se distinguant par ses très bonnes qualités de résistance mécanique et de résistance à la corrosion dans des environnements à hydrogène gazeux à haute pression. L'invention concerne également un récipient pour de l'hydrogène gazeux à haute pression fait d'un tel acier inoxydable. La composition chimique de cet acier inoxydable comprend, en % massique, C: 0,04 % maxi, Si: 1,0 % maxi, Mn: 7 à 30 %, Cr: 15 à 22 %, Ni: 5 à 20 %, V: 0,001 à 1,0 %, N: 0,20 à 0,50 %, Al: 0,10 % maxi, le complément à 100 étant constitué de Fe et des impuretés à l'état de trace, et notamment 0,030 % maxi pour P, 0,005 % pour S, et pour Ti, Zr et Hf, chacun 0,01 % maxi. Les teneurs en Cr, Mn et N respectent la relation: 2,5Cr + 3,4Mn = 300N. L'invention concerne enfin un joint soudé pour récipient à hydrogène gazeux à haute pression, ou pour de la quincaillerie, qui est fait de cet acier se caractérise en ce que le métal soudé respecte la relation: -11 = Nieq 1,1 .OElig. Creq = -8.
Igarashi Masaaki
Miyahara Mitsuo
Ogawa Kazuhiro
Omura Tomohiko
Semba Hiroyuki
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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