Haynes 242
It has good high-temperature strength, low thermal expansion properties, and good oxidation resistance.
Haines Alloy 242 is a hardenable nickel-molybdenum-chromium alloy that gains strength in long-distance sequence reactions as it ages. It has tensile and creep strength properties up to 1300°F (705°C), which is twice that of solid solution strengthened alloys, but has high ductility under aging conditions. The thermal properties of alloy 242 are very low compared to most other alloys, and it has excellent oxidation resistance to 1500°F (815°C). Other attractive features include good low cycle fatigue properties, very good thermal stability, and resistance to high temperature fluorine and fluorine environments.
Type Analysis
Principal Features
forming and welding
Haines alloy 242 has very good forming and welding properties under annealed conditions. It can be forged or hot worked by conventional techniques, and it can be easily cold formed. The above welding can be performed by standard gas tungsten arc (GTAW) or gas metal arc (GMAW) techniques under annealed conditions. The use of matching composting metal is suggested.
heat treatment
Haines Alloy 242 is supplied annealed unless otherwise specified. Alloys are typically annealed in the range of 1900-2050°F (925-1120°C) depending on specific requirements, followed by air cooling (or faster cooling) to age. Water quenching is recommended for heavy section components.
Aging is performed at 1200°F (650°C) for 24 hours, followed by air cooling.
Available in a convenient format
Haines Alloy 242 is manufactured in various sizes of refurbished billets, bars, plates, sheets, and wire welded products. Other forms can be made upon request.
apply
Haines alloy 242 combines properties that make it ideal for a variety of component applications in the aerospace industry. It will be used for sealing, hangars, rocket nozzles, pumps, and many others. In the chemical process industry, alloy 242 has good resistance to high temperature fluoride mixtures, so it will be used in processes involving high temperature hydrofluoric acid vapors.
Alloy 242's high strength and fluorine environmental resistance have been shown to provide excellent service even in fluoroelastomer processing equipment such as extrusion screws.
Principal Features
Haines Alloy 242 is an age hardenable material that combines excellent strength under aging conditions with ductility and good weave properties under annealing conditions. It is particularly effective for strength limiting applications down to 1300°F (750°C), which is twice as strong as typical solid solution hardened alloys. It can be used at high temperatures with still good solid solution strength, but oxidation resistance is limited to around 1500-1600°F (815-870°C).
Comparison of Thermal Expansion Characteristics
Haines alloy 242 exhibits significantly lower thermal expansion properties than most nickel-based high temperature alloys in the temperature range up to 1600°F (870°C).
It expands significantly compared to Alloy 909 below 1000°F (540°C), but at high temperatures the difference narrows considerably.
