Haynes International, Inc. is pleased to announce the development of HAYNES® HR-224® alloy, a new alloy with excellent oxidation resistance and improved fabricability and weldability compared to HAYNES® 214® alloy. This Ni–27.5Fe–20Cr–3.8Al alloy achieves superior oxidation resistance through the formation of a tightly adherent alumina protective scale. It exhibits excellent ductility and formability characteristics, with weldability on par with nickel-iron-chromium alloys of substantially lower aluminum contents. Potential uses include applications in heat recuperators, automotive catalytic converters and heat shields, strand annealing furnace tubulars, and other severely oxidizing environments.
1,008-Hour Oxidation Resistance Preliminary Test Results
| Alloy |
1800°F (982°C) Static Air |
1400°F (760°C) Air + 5% Water Vapor |
| Average Metal Affected |
Average Metal Affected |
Maximum Metal Affected |
| - |
mils |
µm |
mils |
µm |
mils |
µm |
| 214® |
0.2 |
4 |
0.05 |
1.3 |
0.11 |
2.8 |
| HR-224® |
0.2 |
4 |
0.11 |
2.8 |
0.23 |
5.8 |
| 230® |
0.7 |
18 |
0.24 |
6.1 |
0.43 |
10.9 |
*Average Metal Affected = Metal Loss + Average Penetration; Maximum Metal Affected = Metal Loss + Maximum Internal Penetration
HAYNES® HR-224® Alloy Preliminary Tensile Results
Test
Temperature |
0.2%
YieldStrength |
Ultimate
Tensile Strength |
Elongation |
| °F |
°C |
ksi |
MPa |
ksi |
MPa |
% |
| RT |
RT |
50 |
342 |
107 |
739 |
45 |
| 1400 |
760 |
58 |
401 |
70 |
481 |
27 |
RT= Room Temperature
HAYNES® HR-224® alloy will become available for commercial sale upon completion of key process developments. It is being manufactured in a variety of forms, including sheet, plate, bar, structural and weld wire, and welded tubular products. Material for trial evaluations and fabrications is available.
Please contact Dr. Keith Kruger at (765) 456-6098 or kkruger@haynesintl.com for more information.