HAYNES 242 ALLOY

1 Cover/Back HAYNES 242 ALLOY 3/22/00 1:12 AM Page 2. HIGH-TEMPERATURE ALLOYS. HAYNES 242 ALLOY . An age-hardenable Ni-Mo-Cr ALLOY that combines high- temperature strength, low thermal expansion characteristics and good oxidation-resistance for service to 1400 0F (7600C). Also resistance to high-temperature fluorine and fluoride Contents environments. Principal Features 3. Chemical Composition 3. Stress-Rupture Properties 4. Tensile Properties 6. Cold-Worked and Aged Tensile Properties 8. Comparison of Thermal Expansion Characteristics 9. Fatigue Properties 10. Hot Hardness Data 10. Thermal Stability 11. Physical Properties 12. Oxidation Resistance 14. Resistance to High-Temperature Fluoride Environments 16.

2 Resistance to Nitriding 17. Resistance to Salt Spray Corrosion 17. Resistance to Hydrogen Embrittlement 17. Aqueous Corrosion Resistance 18. Fabrication and Welding 18. Health and Safety Information19. Machining 19. H-3079E. NEW LONG-RANGE-ORDER STRENGTHENING MECHANISM. HAYNES 242 ALLOY derives its ductility. The ordered age-hardened strength from a Ni2(Mo,Cr)-type domains unique long-range-ordering are less than a few hundred reaction which essentially Angstroms in size, and are doubles the un-aged strength visible only with the use of while preserving excellent electron microscopy. Transmission electron micrograph showing long-range-ordered domains (dark lenticular particles) in 242TM ALLOY .

3 (Courtesy Dr. Vijay Vasudevan, University of Cincinnati). Sample was solution heat treated at 2012 0F (1100 0C) and aged for 100 hours at 1200 0 F (650 0 C). 2000 by HAYNES International, Inc. HAYNES 242 ALLOY 2. PRINCIPAL FEATURES. Excellent High-Temperature condition. It may be forged or upon request. otherwise hot-worked by Strength, Low Thermal Expan- conventional techniques, and it Applications HAYNES 242 ALLOY combines sion Characteristics, and is readily cold formable. properties which make it Good Oxidation Resistance Welding may be performed in the annealed condition by ideally suited for a variety of HAYNES 242 ALLOY is an age- component applications in hardenable nickel-molybdenum- standard gas tungsten arc (GTAW) or gas metal arc the aerospace industry.

4 It will chromium ALLOY which derives its be used for seal rings, strength from a long-range- (GMAW) techniques. Use of matching composition filler containment rings, duct ordering reaction upon aging. It segments, casings, fasteners, has tensile and creep strength metal is suggested. For further information on forming and rocket nozzles, pumps, and properties up to 13000F (7050C) many others. In the chemical which are as much as double fabrication, contact HAYNES International. process industry, 242 ALLOY those for solid solution strength- will find use in high-tempera- ened alloys, but with high Heat Treatment ture hydrofluoric acid vapor- ductility in the aged condition. HAYNES 242 ALLOY is furnished containing processes as a The thermal expansion charac- in the annealed condition, consequence of its excellent teristics of 242 ALLOY are much unless otherwise specified.

5 The resistance to that environ- lower than those for most other ALLOY is usually annealed in the ment. The ALLOY also displays alloys, and it has very good range of 1900-20500F (925- excellent resistance to high- oxidation resistance up to 15000F 11200C), depending upon temperature fluoride salt (8150C). Other attractive features specific requirements, followed mixtures. The high strength include excellent low cycle by an air cool (or more rapid and fluorine environment- fatigue properties, very good cooling) before aging. A water resistance of 242 ALLOY has thermal stability, and resistance quench is recommended for also been shown to provide to high-temperature fluorine and heavy section components.

6 For excellent service in fluoride environments. Aging is performed at 12000F fluoroelastomer process Fabrication (6500C) for a period of 24-48 equipment, such as extrusion hours, followed by an air cool. screws. HAYNES 242 ALLOY has very good forming and welding Available in Convenient Forms characteristics in the annealed HAYNES 242 ALLOY is produced in the form of reforge billet, bar, plate, sheet, and wire welding products, all in various sizes. Other forms may be produced CHEMICAL COMPOSITION, PERCENT. Ni Mo Cr Fe Co Mn Si Al C B Cu a 65 * * * * * * * *. a As balance *Maximum 3 HAYNES 242 ALLOY STRESS-RUPTURE STRENGTH. HAYNES 242 ALLOY is an age- effective for strength-limited temperatures, where its hardenable material which applications up to 13000F solid-solution strength is combines excellent strength (7050C), where its strength is as still excellent, but oxida- and ductility in the aged much as double that for typical tion resistance limits such condition with good solid-solution strengthened uses to about 1500- fabricability in the annealed alloys.

7 It may be used at higher 16000F (815-8700C). condition. It is particularly COMPARISON OF 100 HOUR STRESS-RUPTURE STRENGTHS*. HAYNES 242 ALLOY 4. STRESS-RUPTURE STRENGTH (continued). HOT- rolled PLATE ANNEALED AND AGED. Test Approximate Initial Stress, Ksi (MPa). Temperature Required to Cause Rupture in Specified Time 0. F (0C) 10 Hrs. 100 Hrs. 1000 Hrs. 1000 (540) 160 (1105) 140 (965) 120 (825). 1100 (595) 130 (895) 110 (760) 93 (640). 1200 (650) 105 (725) 90 (620) 75 (515). 1300 (705) 86 (595) 69 (475) 35 (240). 1400 (760) 62 (425) 29 (200) 17 (115). 1500 (815) 26 (180) 16 (110) 11 (76). 1600 (870) 15 (105) 11 (74) . HAYNES 242 ALLOY 5. TENSILE PROPERTIES. BAR AND RINGS ANNEALED AND AGED.

8 Ultimate Test Tensile Yield Elongation Reduction Temperature Strength Strength in 4D in Area 0. F (0C) Ksi MPa Ksi MPa % %. Room 1290 845 200 (95) 1245 760 400 (205) 1195 705 600 (315) 1160 665 800 (425) 1110 595 1000 (540) 1080 540 1200 (650) 1000 570 1400 (760) 730 310 1600 (870) 500 310 1800 (980) 290 210 COMPARISON OF YIELD STRENGTHS AND ELONGATIONS*. HAYNES 242 ALLOY exhibits much higher yield strength than typical solid-solution-strength- ened nickel-base alloys, such as HASTELLOY S ALLOY , but also possesses excellent ductility in the fully heat-treated condition. This can translate into excellent containment charac- teristics for gas turbine rings and casings, particularly when coupled with 242 ALLOY 's lower expansion coefficient and excellent ductility retention following thermal exposure.

9 This combination is also well suited for a range of fastener and bolting applications up to 13000F (7050C). HAYNES 242 ALLOY 6. TENSILE PROPERTIES (continued). HOT- rolled PLATE ANNEALED AND AGED(a). Ultimate Test Tensile Yield Elongation Reduction Temperature Strength Strength in 4D in Area 0. F (0C) Ksi MPa Ksi MPa % %. 75 (25) 193 1330 126 868 36 . 400 (205) 176 1213 101 696 43 52. 800 (425) 165 1137 91 627 45 52. 1000 (540) 164 1130 89 613 44 51. 1100 (595) 160 1102 89 613 44 51. 1200 (650) 141 971 87 599 29 31. 1300 (705) 118 813 73 503 28 30. COLD- rolled SHEET ANNEALED AND AGED(a). Ultimate Test Tensile Yield Elongation Reduction Temperature Strength Strength in 4D in Area 0.

10 F (0C) Ksi MPa Ksi MPa % %. 75 (25) 187 1288 120 827 38 . 1000 (540) 165 1137 106 730 31 . 1100 (595) 150 1034 102 703 18 . 1200 (650) 135 930 96 661 14 . 1300 (705) 109 751 83 572 10 . (a) Average of two tests per heat, two heats of each product form. Solution Annealed + Aged 12000F-48 hr. 7 HAYNES 242 ALLOY TENSILE PROPERTIES (continued). COLD-REDUCED SHEET AS COLD-WORKED AND COLD-WORKED PLUS AGED. HAYNES 242 ALLOY has excel- thermal expansion characteris- lent strength and ductility as a tics, this makes it an excellent cold-reduced and directly aged choice for fasteners and springs. product. Coupled with its low Ultimate Test Tensile Yield Elongation Temperature Strength Strength in 2 in.