Page 107 - Steam Turbines Design, Applications, and Rerating

88 Chapter Four

TABLE 4.1 Typical Materials of Construction for Multistage Mechanical Drive
Steam Turbines (Continued)

Material Commercial specifications
Non-Condensing (Cast) Cast steel ASTM A-216 Grade WCB
Fabricated Steel ASME SA-516 Grade 60 & 70
Nozzles 12% Chromium AISI-405
Nozzle rings Cast iron ASTM A-278 Class 40
Carbon steel ASME SA-516 Grade 60
12% Chromium-stainless AISI 405
steel
Diaphragm centers
Fabricated Steel ASME SA-516 Grade 60 or
A514-F
Cast Ductile iron ASTM A-536 Grade 60-45-12
Disks (built-up rotors)
Forged Chromium-nickel- AISI 4340 ASTM A471
molybdenum steel Class 6
Cross-rolled plate High-strength alloy steel ASTM A517 Grade F
Blades 12% Chromium-stainless AISI Type 403 or ASTM A565
steel
Shroud Bands 12% Chromium-stainless AISI Type 410
steel
Damping Wire 15% Chromium steel Inconel X750
Rotor Nickel chromium- AISI 4340
molybdenum steel
Built-up Chromium-molybdenum AISI 4140
steel
Integral Chromium-nickel- ASTM A-470 Class 4, 7 or 8
molybdenum-vanadium
steel
Bearing liners Bonded tin-base babbitt ASTM B-23 Alloy #2
Bearing housings Cast steel ASTM A-216 Grade WCB
Bearing retainers Steel ASME SA-516 Grade 60
Shaft end labyrinth seals
Sealing strips High lead bronze ASTM B584
12% Chromium-stainless AISI 410
steel
Stationary baffles Nickel steel ASME SA-516 Grade 60
Chromium-molybdenum- AISI 4340
steel forgings
Governor valves 12% Chromium-stainless AISI Type 410
steel
Governor valve stems and 12% Chromium-stainless AISI Type 416
seals steel, nitrided
Governor valve seats 12% Chromium-stainless AISI Type 416
steel
Bar lift rods and bushings 12% Chromium-stainless AISI Type 416
steel, nitrided
Steam strainer screen Stainless steel AISI Type 321