Very Good High-Temperature Strength Up to 1650°F(900°C), Excellent Ductility, and Excellent Weldability
HAYNES® 263
HAYNES® 263 is an age-hardenable nickel-cobalt-chromium-molybdenum alloy designed specifically to combine very good aged strength properties with excellent fabrication characteristics in the annealed condition. While its strength at elevated temperature is not quite as high as materials such as
WASAPLOY® alloy or alloy
R-41, it is far easier to form or weld than these alloys. Alloy 263 exhibits excellent intermediate temperature tensile ductility, and is not normally subject to strain age cracking problems common for gamma prime strengthened alloys. Alloy 263 is normally used for applications up to about 1650°F (900°C). Its oxidation resistance is comparable to that for other gamma-prime-strengthened superalloys.
Applications
HAYNES® 263 combines properties which make it suitable for a variety of fabricated component applications in both aircraft turbine engine and land-based turbine applications. These include low-temperature combustors, transition liners, and some ring components.
Fabrication
HAYNES® 263 has excellent forming and welding characteristics. The hot working temperature range for the alloy is approximately 1750 to 21 00°F (955- 1150°C). The alloy has excellent ductility in the annealed condition, and thus may also be formed by cold working. Intermediate annealing in the temperature range from 1900 to 2000°(1040 to 1100°C) may be needed for complex component forming operations. All hot- or cold- worked parts should be annealed and rapidly cooled in order to restore the best balance of properties. Alloy 263 can be welded by manual and automatic welding methods, including gas tungsten arc (TiG), gas metal arc (MIG), electron beam and resistance welding. Matching composition filler wire is available, and is generally used for welding alloy 263.
Welding Procedures
Welding procedures common to most high-temperature, nickel-base alloys are recommended. These include use of stringer beads and an interpass temperature less than 200°F (95°C). Preheat is not required. Cleanliness is critical, and careful attention should be given to the removal of grease, oil, crayon marks, shop dirt, etc. prior to welding. Because of the alloy’s high nickel content, the weld puddle will be somewhat “sluggish” relative to steels. To avoid lack of fusion and incomplete penetration defects, the root opening and bevel should be sufficiently open.
Filler Metals
HAYNES® 263 should be joined using matching filler metal. For welding alloy 263 to other alloys,
HASTELLOY® S or
W filler wires are suggested.
Heat Treatment
Wrought HAYNES® 263 alloy is furnished in the solution heat-treated condition unless otherwise specified. The alloy is normally solution heat-treated at 21 00°F±25°F (11 50°C±1 4°C) and rapidly cooled or water quenched for optimal properties. Following solution heat treatment, the alloy is age-hardened at 1470°F (800°C) for eight (8) hours, and air-cooled.
Post-Weld Heat Treatment
HAYNES® 263 is normally used in the fully-aged condition. Following forming and welding, a full solution anneal prior to aging is often employed in order to develop the best joint and overall fabrication properties. The best practice is dependent upon the specific condition of the fabrication prior to aging.
Specifications:
| Nominal Chemical Composition (%) |
| Ni |
Co |
Fe |
Cr |
Mo |
Mn |
Si |
Al |
Ti |
C |
Cu |
| Bal |
20 |
0.7 max |
20 |
6 |
0.6 max |
0.4 max |
0.6 max |
2.4 max |
0.06 max |
0.2 max |
