Patent ID: 9039365
Filing Date: 2015-05-26
Classification: F01D,Y10T

Abstract:
1. A sectioned rotor, comprising: a shaft high pressure section having a first end and a second end; and a shaft intermediate pressure section joined to the second end of the shaft high pressure section; wherein the shaft high pressure section comprises: wherein the shaft intermediate pressure section comprises: wherein at least a portion of the second high pressure section is formed of a high-chromium alloy steel comprising 0.1-1.2 wt % of Mn, up to 1.5 wt % of Ni, 8.0-15.0 wt % of Cr, up to 4.0 wt % of Co, 0.5-3.0 wt % of Mo, 0.05-1.0 wt % of V, 0.02-0.5 wt % of Nb, 0.005-0.15 wt % of N, up to 0.04 wt % of B, up to 3.0 wt % of W, and balance Fe and incidental impurities, and the first weld is along a main steam flow path and the shaft intermediate pressure section is joined to the third high pressure section of the shaft high pressure section by bolting, the third high pressure section being formed of a low-chromium alloy steel.