|
1800°F (982°C) |
2000°F (1093°C) |
|
|
Average Metal |
|
Average Metal |
|
Metal Loss |
Affected |
Metal Loss |
Affected |
Material |
mils mm |
mils mm |
mils mm |
mils mm |
Alloy 600 |
0.3 |
0.008 |
0.09 |
0.023 |
1.1 |
0.028 |
1.6 |
0.041 |
601 alloy |
0.5 |
0.013 |
1.3 |
0.033 |
1.2 |
0.030 |
2.6 |
0.066 |
RA 330 alloy |
0.4 |
0.010 |
4.3 |
0.109 |
0.8 |
0.020 |
6.7 |
0.170 |
Alloy 800H |
0.9 |
0.023 |
1.8 |
0.046 |
5.4 |
0.140 |
7.4 |
0.190 |
HR-120 alloy |
0.3 |
0.008 |
3.7 |
0.094 |
1.2 |
0.030 |
7.7 |
0.190 |
253 MA alloy |
1.3 |
0.033 |
2.9 |
0.074 |
0.7 |
0.018 |
8.2 |
0.210 |
RA 85H alloy |
0.5 |
0.013 |
8.2 |
0.210 |
2.9 |
0.074 |
25.9 |
0.660 |
Metal Affected = Metal Loss + Internal Attack
Flowing air at a velocity of 7.0 feet/minute
(2 meters/minute) past the samples. |
| |
| Carburization Resistance |
| HAYNES® HR-120® alloy has good resistance to carburization. Results from 1800 deg. F (982 deg. C)
carburization testing show HR-120 alloy to be better than stainless steels. Both pack and gaseous
carburization test results are presented. |
Carburization Resistance of Various Alloys at 1800°F (982°C)
for 500 Hours in Graphite |
|
Carburization Resistance of Various Alloys at 1800°F (982°C)
for 55 Hours in Ar-5%H2-1%CH4 |
|
| Comparative Sulfidation Resistance |
| Independent outside testing laboratories have also verified the superior performance of HR-120® alloy in
sulfidizing environments. Petten Establishment in the Netherlands found that HR-120 alloy performed
significantly better than alloys 800H, 347SS and 321SS at 1290 deg. F (700 deg. C) in hydrogen plus 7
percent carbon monoxide plus 1.5 percent water vapor plus 0.6 percent hydrogen sulfide. The HR-120
alloy was found to be magnitudes better than the other alloys. |
|
H2+7%CO+1.5%H2O+0.6%H2S at 1290°F (700°C)
Po2=1x10-23 atm.
Ps2=1x10-9 atm.
ac=0.3-0.4 |
| Hot Corrosion Comparison |
Hot corrosion is an accelerated oxidation or sulfidation attack due to a molten salt deposit. This form of
corrosion is seen in gas turbines as well as in other industrial environments. The hot corrosion resistance
of the HR-120® alloy was evaluated by performing laboratory burner rig testing. The burner rig
used No. 2 fuel oil with a sulfur content of about 1 weight percent and air to generate the test environment.
The air-to-fuel ratio was maintained at 35 to 1. The test was run at 1650 deg. F (900 deg. C) for
500 hours with a two-minute cooling cycle to less than 400 deg. F (205 deg. C) every hour. During
testing a synthetic sea salt solution (ASTM D1141-52) was continuously injected into the combustion
zone. The following photographs show the appearance of the specimens after testing. Specimens of
253 MA, RA 85H, RA 330, and 800H alloys were either severely corroded or partially destroyed. On the
other hand, the HR-120 alloy specimen still looks extremely good, showing little attack. |
|
| Hot corrosion test specimens after exposure at 1650 deg. F (900 deg. C) for 500 hours using 50 ppm
sea salt injection and 1 percent sulfur fuel. |
