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HAYNES® Alloys

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

230 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

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