HAYNES® 242® alloy for Gas Turbine & Aerospace Applications Tech Brief

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Typical Mean Coefficient of Expansion

°F °C µin/in µm/m
RT RT – –
800 400 6.7 11.9
1000 550 6.8 12.3
1100 600 6.8 12.3
1200 650 6.9 12.4
1300 700 7.2 130

Nominal Composition

Nickel Balance
Molybdenum 25
Chromium 8
Iron 2 max.
Cobalt 2.5 max.
Manganese 0.8 max.
Silicon 0.8 max.
Aluminum 0.5 max.
Carbon 0.03 max.
Boron 0.006 max.
Copper 0.5 max.

For Gas Turbine and Aerospace Applications Requiring Low Thermal Expansion, High-Strength, and Oxidation-Resistance

HAYNES® 242® alloy is a unique, age-hardenable alloy that combines relatively low thermal expansion characteristics with outstanding strength, fatigue-resistance, and oxidation resistance for service temperatures as high as 1400°F (760°C). It is ideally suited to use in seal rings, containment rings, duct segments, casings, fasteners, rocket nozzles, pumps, and many other components. 242® alloy has tensile and creep strength properties up to 1300°F (705°C). These properties are as much as double those of solid solution-strengthened alloys and are comparable to those of some precipitation-hardened super alloys.

242® alloy has excellent tensile ductility over the entire temperature range and superior, low-cycle fatigue strength. It is also readily formed and welded by conventional techniques. Although 242® alloy contains only 8% chromium, its oxidation resistance is sufficient to allow its use in an uncoated condition at temperatures as high as 1500°F (815°C). This attribute gives this alloy a real advantage over other low-expansion alloys.

Typical Tensile Properties, Plate

Test Temperature 0.2%Yield Strength Ultimate Tensile Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 110 760 179 1235 39
800 425 80 550 154 1060 44
1000 540 70 485 145 1000 47
1200 650 76 525 142 980 43
1400 760 42 290 106 730 66
1600 870 40 275 69 475 56
1800 980 28 195 41 285 65

Typical Rupture Strength, Plate

Test Temperature Typical Rupture Properties: Stress Required to Produce Rupture in Hours Shown
10 h 100 h 1,000 h
°F °C ksi MPa ksi MPa ksi MPa
1000 540 160 1105 140 965 120 825
1100 595 130 895 110 760 93 640
1200 650 105 725 85 585 68 470
1300 705 80 550 63 435 43 295
1400 760 59 405 35 240 17 120

Typical Room Temperature Physical Properties

Physical Property British Units Metric Units
Density
0.327 lb/in3
9.06 g/cm3
Electrical Resistivity 48.0 µohm-in 122.0 µohm-cm
Modulus of Elasticity
33.2 x 106 psi
 229 GPA
Thermal Conductivity
75.7 Btu-in/ft2-h-°F
 11.3 W/m-°C
Specific Heat 0.092 Btu/lb-°F 386 J/Kg-°C

Environmental Resistance

Oxidation Resistance – Excellent to 1400°F (760°C)

Gaseous Fluorine & HF – Excellent to 1650°F (900°C)

Molten Chloride/Fluoride Salts – Excellent to 1650°F (900°C)

Chloride Stress Cracking Resistance – Excellent

Chlorination – Excellent in Reducing Environments

Hydrogen Embrittlement Resistance – Fair to Good