Ni-base heat-resistant alloy and weld joint thereof

Details Ni-base heat-resistant alloy and weld joint thereof Ni-base heat-resistant alloy and weld joint thereof

C - Chemistry, Metallurgy

22

C

C22C 19/05 (2006.01) B23K 35/30 (2006.01)

Patent

CA 2396578

A Ni-base heat resistant alloy excellent in weldability and strength at elevated temperatures and suited for use in manufacturing cracking furnace tubes and reformer furnace tubes to be used in ethylene plants as well as a welded joint therefor is provided. The alloy of the invention is a Ni-base heat- resistant alloy, which comprises C: not more than 0.1%, Si: not more than 2%, Mn: not more than 2%, P: not more than 0.025%, S: not more than 0.005%, N: not more than 0.04%, Cr: 10 to 30%, Al: 2.1 to less than 4.5%, and Mo: 2.5 to 15% or W: 2.5 to 9% or Mo and W: 2.5 to 15% in total, and satisfies the relation (1) given below: (104Si + 1980P + 1980S + 9Al + 15Ti + 11Nb + 1.8W + 11600B) ~ {1.1(240 - 20000S - 1900P - 30Al- 10Ti - 9W + 17000B) ... (1) In the welded joint of the invention, both of the base metal and weld metal are made of the alloy having the above composition, and the ST value of the weld metal as calculated according to the following formula (2) or (3) is larger by not less than 3 than the ST value of the base metal: in the case of Ti ~ 4C; ST = Mo + 1.5W + 100Ti ... (2) in the case of Ti > 4C; ST = Mo + 1.5W + 400C ... (3).

L'invention concerne un alliage réfractaire à base de nickel (Ni) dont la composition chimique est la suivante: C: 0,1 % ou moins, Si: 2 % ou moins, Mn: 2 % ou moins, P: 0,025 % ou moins, S: 0,005 % ou moins, N: 0,04 ou moins, Cr: entre 10 et 30 %, Al: 2,1 ou plus et moins de 4,5 %, Mo: entre 2,5 et 15 % ou W: entre 2,5 et 9 %, ou la somme de Mo et W: entre 2,5 et 15 %, et la masse d'équilibrage: sensiblement Ni, à condition que les composés précités correspondent à la formule suivante (1): (104Si + 1980P + 1980S + 9AL + 15Ti + 11Nb + 1,8W + 11600B) </= {1,1 (240-20000S- 1900P- 30AL- 10Ti- 9W + 17000B} (1). Par ailleurs, l'invention concerne un joint soudé renfermant un métal de base et un métal fondu contenant tous deux un alliage présentant la composition précitée, et dans lequel la valeur ST du métal fondu calculée avec la formule (2) ou (3) suivante: lorsque Ti </= 4C, ST= Mo + 1,5W + 100Ti} (2), lorsque Ti > 4C, ST = Mo + 1,5W + 400C} (3), est supérieure à celle du matériau de base, la différence entre ces valeurs étant 3 ou plus. L'alliage réfractaire à base de nickel (Ni) présente d'excellentes caractéristiques en terme de soudabilité et de résistance à haute température, ce qui permet de l'utiliser dans un four de craquage et un four de reformage pour une installation à éthylène.

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