Power & Energy

Two different battles: high-temperature pressure parts (boiler, turbine) and wet flue-gas corrosion (FGD, ductwork). The second is where 304 is routinely eliminated.

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Typical parts and material selection

Part	Grade	Surface / size	Watch out for
FGD absorber tower	316L / 2205	Plate 6–20 mm	Dew-point corrosion, weld quality
Duct / expansion joint	316L / 317L	2–6 mm	Acidic condensate, fatigue
Condenser tube	304 / 316L / Ti	Tube Φ19–25	Flow erosion, ammonia attack
Support / platform grating	304 / 316L	Section / grating	Atmospheric corrosion, load
Coal & ash handling	304 / duplex	Wear plate 6–20 mm	Abrasion plus corrosion

These are the usual configurations. Actual selection depends on medium, temperature and welding method — the same part may move from 304 to 316L or 2205. Describing the service conditions is more useful than naming a grade.

Three real constraints in this industry

Wet flue gas must be sized on dew point

Flue-gas dew points sit at 90–130 °C and the condensate can reach pH 2–3 with chlorides. Under those conditions 304 typically lasts under two years — go straight to 316L or 2205.

High-temperature parts are designed on creep

Boiler and turbine components are sized by creep strength. Check the 100,000-hour rupture strength at the service temperature, not the room-temperature tensile value.

Much of it is welded on site

Towers and ducts are largely site-welded. Include WPS/PQR and post-weld pickling & passivation in the delivery scope, or rust complaints start during installation.