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The following results were generated for standard burner rig high-velocity dynamic oxidation tests. Exposures were 1000 hours at 1800°F (980°C). Samples were exposed in a rotating carousel to products of combustion of a mixture of No. 1 and No. 2 fuel burned at an air: fuel ratio of about 50:1. Gas velocity was 0.3 Mach. Samples were automatically removed from the gas stream every 30 minutes, and fan cooled to under 500°F (260°C). Following exposure, samples were evaluated metallographically to determine the extent of metal loss, or thinning, and the average depth of internal penetration. Average metal affected is the sum of these quantities.

Oxidation in Combustion Gases

Alloy 1800°F (980°C)/1000 h 2000°F (1095°C)/500 h
Metal Loss Average Metal Affected Metal Loss Average Metal Affected
- mils µm mils µm mils µm mils µm
214® 0.4 10 1.0 25 0.5 13 1.2 30
230® 0.8 20 2.8 71 2.2 56 5.2 132
188 1.1 28 3.5 89 7.5 191 9.8 249
556® 1.7 43 4.9 124 8.7 221 10.8 274
HR-160® - - - - 4.6 117 11.2 284
X 2.7 69 5.6 142 9.0 229 12.9 328
S 3.1 79 5.9 150 11.8 300 13.7 348
625 4.9 124 7.1 180 >31.0 >787 >31.0 >787
25 6.2 157 8.3 211 >25.0a >635a >25.0a >635a
617 2.7 69 9.8 249 >24.0b 315 >24.0b >610b
RA330 7.8 198 11.8 300 12.9 277 12.9 328
MULTIMET® 11.8 300 14.4 366 53.8c 1247C 53.8c 1367c
600 12.3d 312d 14.4d 366d 19.5 437 19.5 495
800H 12.3 312 14.5 368 33.4e 775e 33.4e 848e
310 13.7 348 16.2 411 23.7 538 23.7 602
601 3.0 76 18.8 478 >24.0b 272 >24.0b >610b
304/316L - - >>23.0f >>584f >>23.0f - >>23.0f >>584f

aConsumed in 165 hours. bInternal penetration through entire thickness. cExtrapolated from 225 hours. dExtrapolated from 917 hours. eExtrapolated from 400 hours. fConsumed in 65 hours.

Oxidation in Flowing Air

The following results were generated for 1008 hour exposures to gently flowing air in a tube furnace. Samples were cycled to room temperature once-a-week. Following exposure, samples were evaluated metallographically to determine the extent of metal loss, or thinning, and the average depth of internal penetration. Average metal affected is the sum of these two quantities.

Alloy   Average Metal Affected**  
1800°F (980°C)   2000°F (1095°C)   2100°F (1150°C)   2200°F (1205°C)  
-   mils   µm   mils   µm   mils   µm   mils   µm  
214®   0.2   5   0.1   3   0.3   8   0.7   18  
230®   0.7   18   1.3   33   3.4   86   7.9   201  
S   0.5   13   1.3   33   1.7   43   >31.7   >805  
188   0.6   15   1.3   33   8.0   203   >21.   >551  
600   0.9   23   1.6   41   2.9   74   8.4   213  
617   1.3   33   1.8   46   3.4   86   12.5   318  
310   1.1   28   2.3   58   4.4   112   10.3   262  
556®   1.1   28   2.6   66   11.6   295   >150.0   >3810  
601   1.3   33   2.6   66   5.3   135   7.5*   191*  
X   0.9   23   2.7   69   5.8   147   >35.4   >899  
150   1.0   25   3.8   97   >26.8   >681   >46.1   >1171  
625   0.7   18   4.8   122   18.2   462   >47.6   >1209  
RA330   4.3   109   6.7   170   8.7   221   -   -  
800H   1.8   46   7.4   188   8.9   226   13.6   345  
HR-120®   3.7   94   7.7   196   16.3   414   25.3   643  
253MA   2.9   74   8.2   208   16.4   417   29.2   742  
25   0.7   18   10.2   259   19.2   488   >37.9   >963  
HR-160®   5.9   150   10.3   262   13.0   330   24.2   615  
MULTIMET®   1.3   33   11.6   295   >47.2   >1199   >146.4   >3719  
800HT   3.8   97   12.0   305   18.8   478   >58.0   >1473  
446   2.3   58   14.5   368   >21.7   >551   >23.3   >592  
304   8.1   206   >27.1   >688   >23.6   >599   >68.0   >1727  
316L   14.3   363   >68.4   >1737   >105.0   >2667   >140.0   >3566  

* Large internal voids not included

** All figures shown as greater than stated value represent extrapolation of tests for which samples were consumed in less than 1008 hours.

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