Comparative Oxidation-Resistance in Flowing Air at 1500°F (815°C) for 1008 Hours*
Alloy |
Metal Loss |
Average Metal Affected |
- |
mils |
µm |
mils |
µm |
242® |
0.0 |
0 |
0.5 |
13 |
S |
0.0 |
0 |
0.5 |
13 |
X |
0.1 |
3 |
1.1 |
28 |
N |
0.4 |
10 |
1.2 |
30 |
B |
7.2 |
183 |
8.2 |
208 |
909 |
4.4 |
112 |
19.4 |
493 |
*Coupons exposed to flowing air at a velocity of 7.0 feet/minute (2.1m/minute) past the samples. Samples cycled to room temperature once-a-day.
Comparative Oxidation Resistance in Flowing Air, 10 Months (7200 h),
Cycled Every Two Months**
Alloy |
800°F (427°C) |
1000°F (538°C) |
1200°F (649°C) |
Metal Loss |
Average Metal Affected |
Metal Loss |
Average Metal Affected |
Metal Loss |
Average Metal Affected |
mils |
μm |
mils |
μm |
mils |
μm |
mils |
μm |
mils |
μm |
mils |
μm |
718 |
0 |
0 |
0 |
0 |
0 |
0 |
0.1 |
3 |
0 |
0 |
0.2 |
5 |
242® |
0 |
0 |
0 |
0 |
0 |
0 |
0.1 |
3 |
0 |
0 |
0.3 |
8 |
263 |
0 |
0 |
0 |
0 |
0 |
0 |
0.1 |
3 |
0 |
0 |
0.3 |
8 |
** Coupons exposed to flowing air at a velocity of 7.0 feet/minute (2.1m/minute) past the samples. Samples cycled to room temperature once every two months.
Comparative Burner Rig Oxidation-Resistance at 1400°F (760°C) for 500 Hours***
Alloy |
Metal Loss
|
Average Metal Affected
|
mils |
µm |
mils |
µm |
N |
0.7 |
18 |
0.8 |
20 |
242® |
1.1 |
28 |
1.2 |
30 |
B |
1.8 |
46 |
2.6 |
66 |
909 |
0.3 |
8 |
10.8 |
275 |
***Burner rig oxidation tests were conducted by exposing samples 3/8 inch x 2.5 inches x thickness (9mm x 64mm x thickness), in a rotating holder, to the products of combustion of No. 2 fuel oil burned at a ratio of air to fuel of about 50:1. (Gas velocity was about 0.3 mach). Samples were automatically removed from the gas stream every 30 minutes and fan-cooled to near ambient temperature and then reinserted into the flame tunnel.