Oxidation Resistance

Metallographic Technique used for Evaluating Environmental Tests

214 environmental tests

Static Oxidation

HAYNES® HR-120® alloy exhibits good resistance to oxidizing environments and can be used at temperatures up to 2100°F (1150°C). The following are comparative static oxidation test results at 1600°F (870°C), 1800°F (980°C), 2000°F (1090°C), and 2100°F (1150°C) for 1008 hours.

Alloy	1600°F (870°C)				1800°F (980°C)				2000°F (1090°C)				2100°F (1150°C)
	Metal Loss		Average Metal Affected		Metal Loss		Average Metal Affected		Metal Loss		Average Metal Affected		Metal Loss		Average Metal Affected
	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm
HR‐120®	0.1	0.00	0.9	0.02	0.4	0.01	2.1	0.05	1.0	0.03	4.4	0.11	7.9	0.20	10.1	0.26
253MA	0.2	0.01	0.9	0.02	1.3	0.03	3.0	0.08	0.7	0.02	8.2	0.21	8.7	0.22	16.5	0.42
800HT	0.1	0.00	1.0	0.03	0.5	0.01	4.1	0.10	7.6	0.19	11.6	0.29	11.0	0.28	15.0	0.38
601	-	-	-	-	0.4	0.01	1.7	0.04	1.3	0.03	3.8	0.10	2.8	0.07	6.5	0.17
600	-	-	-	-	0.3	0.01	2.4	0.06	0.9	0.02	3.3	0.08	2.8	0.07	4.8	0.12
RA330	-	-	-	-	0.3	0.01	3.0	0.08	0.8	0.02	6.7	0.17	-	-	-	-
304SS	-	-	-	-	5.5	0.14	8.1	0.21	NA	NA	>19.6	>0.498	NA	NA	>19.5	>0.498
RA85H	-	-	-	-	0.5	0.01	8.3	0.21	3.0	0.08	26.0	0.66	-	-	-	-

Dynamic Oxidation

Burner rig oxidation tests were conducted by exposing samples of 3/8” x 2.5” x thickness (9mm x 64 mm x thickness), in a rotating holder to the products of combustion of 2 parts No. 1 and 1 part No. 2 fuel 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.

1800°F/1000-h/2000-Cycles
Alloy	Metal Loss		Average Metal Affected
Alloy	mils	µm	mils	µm
556®	3.9	99	6.8	173
HR-120®	6.3	160	8.4	213
RA 330	6.5	165	9.5	241
800H/800HT	8.9	226	13.7	348
310 SS	16.0	406	18.3	465
253MA	16.6	422	17.8	452

Long-term Oxidation

Amount of metal affected for high‐temperature plate (0.25”) alloys exposed for 360 days (8,640 hours) in flowing air. Cycled once per month.

Alloy	Exposure Duration		1600°F				1800°F				2000°F				2100°F
	Exposure Duration		Metal Loss		Average Metal Affected		Metal Loss		Average Metal Affected		Metal Loss		Average Metal Affected		Metal Loss		Average Metal Affected
	h	number of cycles	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm
214®	8640	12	0.1	0.00	0.2	0.01	0.0	0.00	0.0	0.00	0.0	0.00	0.0	0.00	0.0	0.00	0.0	0.00
230®	8640	12	0.2	0.01	1.4	0.04	0.1	0.00	2.5	0.06	3.4	0.09	11.0	0.28	28.5	0.72	34.4	0.87
HR-120®	8640	12	0.3	0.01	1.6	0.04	0.5	0.01	3.3	0.08	18.1	0.46	23.2	0.59	33.6	0.85	44.0	1.12
556®	8640	12	0.3	0.01	1.9	0.05	0.5	0.01	6.2	0.16	15.0	0.38	24.1	0.61	-	-	-	-
617	8640	12	0.3	0.01	1.6	0.04	-	-	-	-	-	-	-	-	-	-	-	-
800HT	8640	12	0.4	0.01	2.9	0.07	-	-	-	-	-	-	-	-	-	-	-	-

Water Vapor Testing

Alloy	1008 hours at 1600ºF Cycled 1x/week in air+10% H₂O				1008 hours at 1600ºF Cycled 1x/week in air+20% H₂O				6 months at 1400ºF Cycled 1x/week in air+10% H₂O
	Meal Loss		Average Metal Affected		Meal Loss		Average Metal Affected		Meal Loss		Average Metal Affected
	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm	mils	mm
HR-120®	0.09	0.002	0.68	0.017	0.04	0.001	0.29	0.007	0.10	0.003	0.50	0.013
253MA	0.66	0.017	1.59	0.040	0.08	0.002	0.68	0.017	-	-	-	-
347SS	0.86	0.022	1.48	0.038	0.18	0.005	0.88	0.022	0.46	0.012	1.26	0.032
800HT	-	-	-	-	-	-	-	-	0.12	0.003	0.82	0.021

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