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HAYNES 242 (N10242)

HAYNES® 242, UNS N10242


Seal rings, containment rings, duct segments, casings, fasteners, rocket nozzles, pumps, honeycombs. Chemical processing: such as high temperature HF vapor containing process, fluoroelastomer process equipment.

Alloy 242 Description

Alloy 242 is an age hardenable nickel-molybdenum-chromium alloy which derives strength from a log-range ordering reaction upon aging. It has tensile and creep strength properties up to 1300°F which are as much as double for solid solution strengthened alloys, but with high ductility in the aged condition. The thermal expansion characteristics of alloy 242 are much lower than those for most other alloys, and it has very good oxidation resistance up to 1500°F.

Chemistry Typical

Nickel: Balance
Molybdenum: 24.00 – 26.00
Chromium: 7.00 – 9.00
Iron: 2.00 max
Cobalt: 2.50 max
Manganese: 0.80 max
Silicon: 0.80 max
Aluminum: 0.50 max
Carbon: 0.03 max
Boron: 0.006 max
Copper: 0.50 max

Physical Properties

Density, 0.327 lbs/in³, 9.05 g/cm³

Specific Heat BTU/lb.-°F( J/Kg-K):
At 70°F (21°C): 0.092 (386)

Mean Coefficient of Thermal Expansion: in/in/°F (mm/m/°C):
70- 212°F (20- 100°C): 6.0 x 10-6 (10.8)

Thermal Conductivity: BTU-in/h-ft-°F (W/m-°K):
70°F (21°C): 75.7 (11.3)

Modulus of Elasticity: ksi (MPa)
33.2 x 10³ (229 x 10³) in tension

Melting Point: 2350-2510°F (1290-1375°C)


Coil – Strip, Foil, Ribbon
Flanges, Pipe, Fittings

Mechanical Properties at Room Temperature

Annealed Typical
Ultimate Tensile Strength: 105 KSI min, (950 MPa min)
Yield Strength: (0.2% offset) 45 KSI min, 310 MPa min)
Elongation: 40% min
Grain Size: ASTM 3 min

Additional Properties

Corrosion Resistance
Refer to NACE ( National Association of Corrosion Engineers) for recommendations

#1–Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required.
#2D-Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process.
#2B–Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D.
#BA-Bright annealed cold rolled and bright annealed
#CBA-Course bright annealed cold rolled matte finish and bright anneal
#2-Cold Rolled
#2BA–Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part.
Polished-Various grit finish for specific polish finished requirements
*Not all finishes are available for all alloys – Contact Ulbrich Sales for more information

Heat Treatment
ALLOY 242 can be hardened by:
cold working
age hardening
cold working and age hardening

For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”

Haynes® 242 is a registered trademark of Haynes Alloys

Limitation of Liability and Disclaimer of Warranty: In no event will South Coast Industrial Metals or any of its affiliates be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. South Coast Industrial Metals, Inc. assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.