Heat resisting steel and steam turbine rotor shaft

Details Heat resisting steel and steam turbine rotor shaft Heat resisting steel and steam turbine rotor shaft

C - Chemistry, Metallurgy

22

C

C22C 38/54 (2006.01) C21D 1/18 (2006.01) C21D 9/38 (2006.01) C22C 38/00 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/26 (2006.01) C22C 38/30 (2006.01) C22C 38/32 (2006.01) F16C 3/02 (2006.01)

Patent

CA 2203299

Disclosed is a heat resisting steel whose metal structure is entirely martensite phase produced by tempering after quenching. The steel comprises, by weight, 0.05 to 0.20% C, not more than 0.15% Si, not more than 1.5% Mn, not more than 1.0% Ni, 8.5 to 13.0% Cr, not more than 3.50% Mo, not more than 3.5% W, 0.05 to 0.30% V, 0.01 to 0.20% Nb, not more than 5.0% Co, 0.001 to 0.020% boron, 0.005 to 0.040% nitrogen, 0.0005 to 0.0050% oxygen and 0.00001 to 0.0002% hydrogen. The steel has preferably not more than 10 of the Cr equivalent. The steel has 10 kgf/mm2 or more of 10,0000 hours creep rupture strength at 650;C.

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