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Oxidation Resistance

Comparative Burner Rig Oxidation Resistance, 1000 Hours

Burner rig oxidation tests were conducted by exposing samples 3/8 in. x 2.5 in. x thickness (9 mm x 64 mm x thickness), in a rotating holder, to products of combustion of a mixture of No. 1 and No. 2 fuel oil. This was burned at a ratio of air to fuel of about 50:1 for 1000 hours.  (Gas velocity was about 0.3 mach). Samples were automatically removed from the gas stream every 30 minutes, fan-cooled to near ambient temperature, and then reinserted into the flame tunnel.

Alloy 1800°F (982°C)
Metal Loss Average Metal Affected Maximum Metal Affected
- mils µm mils µm mils µm
230® 0.8 20 2.8 71 3.5 89
X 2.7 69 5.6 142 6.4 153
625 4.9 124 7.1 180 7.6 193
25 6.2 157 8.3 211 8.7 221
MULTIMET® 11.8 300 14.4 366 14.8 376
800H® 12.7 312 14.5 368 15.3 389

Oxidation Resistance in Flowing Air (1008 Hours)

The following are static oxidation test rankings for 1008-hour exposures in flowing air. The samples were cycled to room temperature weekly. Average metal affected is the sum of metal loss plus average internal penetration.

Alloy 1600°F (871°C) 1800°F (982°C)
Metal Loss
 Avg. Met. Aff.
mils, (mm)		 Metal Loss
 Avg. Met. Aff.
mils, (mm)
mils μm mils μm mils μm mils μm
214® 0 0 0.1 3 0.1 3 0.3 8
188 - - - - 0.1 3 1.1 28
230® 0 0 0.6 15 0.2 5 1.5 38
X 0.1 3 0.7 18 0.2 5 1.5 38
625 0.1 3 0.6 15 0.4 10 1.9 48
617 - - - - 0.3 8 2.0 51
25 - - - - 0.3 8 2.0 51
HR‐120® 0.1 3 0.9 23 0.4 10 2.1 53
556® - - - - 0.4 10 2.3 58
800HT 0.1 3 1.0 25 0.5 13 4.1 104
HR‐160® 0.2 5 3.0 79 0.7 18 5.5 140

(Cycled weekly); alloys are arranged in ascending order by the average metal affected.

Amount of metal affected for high‐temperature sheet (0.060 ‐0.125”) alloys exposed for 360 days (8,640‐h) in flowing air at 1600°F (871°C) (Cycled once‐a‐month)

Alloy Metal Loss Avg. Met. Aff.
mils μm mils μm
214® 0.1 3 0.2 5
625 0.3 8 1.4 36
230® 0.2 5 1.4 36
617 0.3 8 1.6 41
HR‐120® 0.3 8 1.6 41
25 0.3 8 1.7 43
188 0.2 5 1.8 46
556® 0.3 8 1.9 48
X 0.3 8 2.2 56
800HT 0.4 10 2.9 74

Comparative Dynamic Oxidation

Alloy 1600°F (871°C), 2000 h, 30-min cycles 1800°F (982°C), 1000 h, 30-min cycles
Metal Loss Average Metal Affected Metal Loss Average Metal Affected
mils µm mils µm mils µm mils µm
188 1.1 28 2.9 74 1.1 28 3.2 81
230® 0.9 23 3.9 99 2.8 71 5.6 142
617 2.0 51 7.8 198 2.4 61 5.7 145
625 1.2 30 2.2 56 3.7 94 6.0 152
556® 1.5 38 3.9 99 4.1 104 6.7 170
X 1.7 43 5.3 135 4.3 109 7.3 185
HR-120® - - - - 6.3 160 8.3 211
RA330 2.5 64 5.0 127 8.7 221 10.5 267
HR-160® - - - - 5.4 137 11.9 302
310SS 6.0 152 7.9 201 16.0 406 18.3 465
800H 3.9 99 9.4 239 22.9 582 Through Thickness

Amount of metal affected for high-temperature sheet alloys exposed for 1008h
(cycled weekly) in air + 10%H2O

Alloy 1600°F (871°C) 1800°F (982°C)
Metal Loss Avg. Met. Aff. Metal Loss Avg. Met. Aff.
mils μm mils μm mils μm mils μm
214® 0.1 1 0.3 7 0.0 1 0.2 6
188 - - - - 0.1 3 1.4 36
230® 0.1 2 0.5 13 0.2 4 1.5 37
625 0.1 3 0.5 12 0.3 8 1.6 41
X 0.0 1 0.5 13 0.3 7 1.8 45
HR-120® 0.1 2 0.7 17 0.3 9 1.9 49
617 0.1 2 0.9 22 0.3 8 2.0 51

Metallographic Technique used for Evaluating Environmental Tests

214 environmental tests

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