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.

	1800°F (980°C)
	Metal Loss		Average Metal Affected		Maximum Metal Affected
Material	Mils	μm	Mils	μm	Mils	μm

HAYNES^® 230^® alloy	0.8	20	2.8	71	3.5	89
HASTELLOY^® X alloy	2.7	69	5.6	142	6.4	153
HAYNES^® 625 alloy	4.9	124	7.1	180	7.6	193
HAYNES^® 25 alloy	6.2	157	8.3	211	8.7	221
MULTIMET^® alloy	11.8	300	14.4	366	14.8	376
Alloy 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.

	1800°F (980°C)				2000°F (1095°C)
	Metal Loss		Average Metal Affected		Metal Loss		Average Metal Affected
Material	Mils	μm	Mils	μm	Mils	μm	Mils	μm

HAYNES^® 230 alloy	0.3	8	0.7	18	0.5	13	1.3	33
HASTELLOY^® X alloy	0.3	8	0.9	23	1.5	38	2.6	66
HAYNES^® 625 alloy	0.3	8	0.7	18	3.3	84	4.8	122
Alloy 800H	0.9	23	1.8	46	5.4	137	7.4	188
HAYNES^® 25 alloy	0.4	10	0.7	18	9.2	234	10.2	259
MULTIMET^® alloy	0.4	10	1.3	33	8.9	226	11.6	295

Haynes International, Inc. 800-354-0806 765-456-6012

HAYNES® 625 alloy Information

A Ni-Cr-Mo-Cb alloy with excellent strength to 1500°F (816°C), good oxidation resistance, and good resistance to aqueous corrosion.

HAYNES^® 625 alloy Information