HAYNES® 230® alloy for Power Plant Applications Tech Brief
For High-Temperature Power Plant Applications
Power plants can certainly have their share of high-temperature corrosion problems when burning low-grade fuels, but even facilities which are clean-fuel-fi red, or which employ fluidized bed combustion technology, can still experience severe materials problems. Frequent replacement or maintenance for components such as burner buckets, dampers, cyclone separators, U-beams, L-valves, and hot gas ducting, among others, can mean costly unscheduled downtime.
HAYNES® 230® alloy is one of the few materials to combine the levels of design strength and combustion environment resistance necessary to ensure the long-lived, low-maintenance performance that will keep the plant running. It is exceptionally well suited for components that normally fail by distorting or cracking, or which suffer severe oxidation. Although not suited for severe sulfur- or chlorine-bearing gas streams, where HAYNES® 556® or HR-160® alloys would be more suitable, 230® alloy does provide excellent service in clean to moderately-dirty environments up to 2100°F (1150°C).
230® alloy is covered by ASME Vessel and Piping Code Case No. 2063-2 for use up to 1650°F (900°C). It is currently in service in several boiler and fluidized bed facilities, and on test in many others.
Resistance to Oxidation in Combustion Gases at 1800°F (980°C) for 1,000 Hour Exposures | ||
Alloy | Average Metal Affected | |
– | mils | µm |
230® | 2.8 | 71 |
X | 5.6 | 142 |
800H | 14.5 | 368 |
Type 310 | 16.2 | 411 |
Type 316 | >23.0 | >584 |
Approximate Rupture Life for 2,000 psi (14 MPa) Stress at 1800°F (980°C) | ||
Alloy | Life | |
– | h | |
230® | 5,000 | |
X | 2,100 | |
800H | 920 | |
253MA | 720 | |
Type 310 | 130 | |
Type 316 | 53 |
Comparative Design Strength
Nominal Composition
Nickel | Balance |
Cobalt | 5 max. |
Chromium | 22 |
Molybdenum | 2 |
Tungsten | 14 |
Iron | 3 max. |
Silicon | 0.4 |
Manganese | 0.5 |
Carbon | 0.10 |
Aluminum | 0.3 |
Boron | 0.015 max. |
Lanthanum | 0.02 |
Hot-Rolled and 2250°F (1232°C) Solution-annealed (Plate)
Test Temperature | Yield Strength 0.2% Offset | Ultimate Tensile Strength | Elongation | |||
°F | °C | ksi | MPa | ksi | MPa | % |
RT | RT | 54.4 | 375 | 121.8 | 840 | 47.7 |
1000 | 538 | 36.4 | 251 | 100.1 | 690 | 54.6 |
1200 | 649 | 37.0 | 255 | 96.0 | 662 | 54.5 |
1400 | 760 | 36.7 | 253 | 76.9 | 530 | 69.5 |
1600 | 871 | 35.1 | 242 | 45.6 | 315 | 99.5 |
1800 | 982 | 17.0 | 118 | 24.7 | 171 | 96.3 |
2000 | 1093 | 9.1 | 63 | 13.2 | 91 | 92.1 |
Typical Rupture Properties, Plate
Test Temperature | Typical Rupture Properties: Stress Required to Produce Rupture in Hours Shown | ||||||
100 h | 1,000 h | 10,000 h | |||||
°F | °C | ksi | MPa | ksi | MPa | ksi | MPa |
1200 | 650 | 56.0 | 385 | 42.5 | 295 | 29.0 | 200 |
1400 | 760 | 27.0 | 185 | 20.0 | 140 | 14.2 | 98 |
1600 | 870 | 13.7 | 95 | 9.5 | 66 | 6.2 | 43 |
1800 | 980 | 6.0 | 41 | 3.0 | 21 | 1.6 | 11 |
1900 | 1040 | 3.5 | 24 | 1.8 | 12 | – | – |
2000 | 1095 | 2.1 | 14 | 1.0 | 7 | – | – |
2100 | 1150 | 1.2 | 8 | 0.6 | 4 | – | – |
Typical Room Temperature Physical Properties
Physical Property | British Units | Metric Units |
Density |
0.324 lb/in3 |
8.97 g/cm3 |
Electrical Resistivity | 49.2 µohm-in | 125 µohm-cm |
Modulus of Elasticity |
30.6 x 106 psi |
211 GPA |
Thermal Conductivity |
62 Btu-in/ft2-h-°F |
8.9 W/m-°C |
Specific Heat | 0.095 Btu/lb-°F | 397 J/Kg-°C |
Environmental Resistance
Oxidation in Air – Excellent at 2100°F (1095°C) Nitriding – Best Commercial alloy
Sulfidation – Equal to X alloy Chlorination – Equal to 625 alloy
Carburization – Equal to X alloy Hydrogen Embrittlement – Excellent