Rotor shaft for a steam turbine

Details Rotor shaft for a steam turbine Rotor shaft for a steam turbine

F - Mech Eng,Light,Heat,Weapons

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F01D 5/06 (2006.01) C22B 9/16 (2006.01) C22C 38/46 (2006.01) F01D 1/00 (2006.01) F01K 23/02 (2006.01)

Patent

CA 2169781

A rotor shaft for a steam turbine integrating high and low pressure portions, is fabricated from a Ni-Cr- Mo-V low alloy steel containing by weight 0.15 to 0.4% C, not more than 0.1% Si, 0.05 to 0.25% Mn, 1.5 to 2.5% Ni, 0.8 to 2.5% Cr, 0.8 to 2.5% Mo and 0.15 to 0.35% V. In this steel the ratio (Mn/Ni) is not more than 0.12 or the ratio(Si + Mn)/Ni is not more than 0.18. - 1 -

Cette invention concerne un arbre de rotor de turbine à vapeur comportant une partie haute pression et une partie basse pression et fait d'acier faiblement allié Ni-Cr-Mo-V renfermant en masse de 0,15 à 0,4 % de C, au plus 0,1 % de Si, de 0,05 à 0,25% de Mn, de 1,5 à 2,5 % de Ni, de 0,8 à 2,5 % de Cr, de 0,8 à 2,5 % de Mo et de 0,15 à 0,35 % de V. Cet acier allié se caractérise par un rapport (Mn/Ni) d'au plus 0,12 ou un rapport (Si + Mn)/Ni d'au plus 0,18.

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