Steel and steel tube for high-temperature use

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/32 (2006.01) C21D 8/10 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/26 (2006.01) C22C 38/30 (2006.01) C22C 38/54 (2006.01)

Patent

CA 2442299

The invention concerns steel for high temperature use containing by weight: 0.06 to 0.20% of C, 0.10 to 1.00% of Si, 0.10 to 1.00% of Mn, not more than 0.010% of S, 10.00 to 13.00% of Cr, not more than 1.00% of Ni, 1.00 to 1.80% of W, Mo such that (W/2+Mo) is not more than 1.50%, 0.50 to 2.00% of Co, 0.15 to 0.35% of V, 0.040 to 0.150% of Nb, 0.030 to 0.12% of N, 0.0010 to 0.0100% of B and optionally up to 0.0100% of Ca, the rest of the chemical composition consisting of iron and impurities or residues resulting from or required for preparation processes or steel casting. The chemical constituent contents preferably verify a relationship such that the steel after normalizing heat treatment between 1050 and 1080·C and tempering has a tempered martensite structure free or practically free of .delta. ferrite.

L'acier pour usage à haute température contient en poids 0,06 à 0,20 % de C, 0,10 à 1,00 % de Si, 0,10 à 1,00 % de Mn, au plus 0,010 % de S, 10,00 à 13,00 % de Cr, au plus 1,00 % de Ni, 1,00 à 1,80 % de W, Mo tel que (W/2+Mo) inférieur ou égal à 1,50 %, 0,50 à 2,00 % de Co, 0,15 à 0,35 % de V, 0,040 à 0,150 % de Nb, 0,030 à 0,12 % de N, 0,0010 à 0,0100 % de B ainsi qu'optionnellement jusqu'à 0,0100 % de Ca, le reste de la composition chimique étant constitué de fer et des impuretés ou des résiduels résultant des ou nécessaires aux procédés d'élaboration ou de coulée de l'acier. Les teneurs en constituants de la composition chimique obéissent préférentiellement en outre à une relation pour que l'acier après traitement thermique de normalisation entre 1050 et 1080~ C et revenu possède une structure martensitique revenue exempte ou quasiment exempte de ferrite .delta..

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