Incoloy 800H and 800HT-Resistance to Carburization

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Incoloy 800H and 800HT-Resistance to Carburization

The incoloy 800, 800H and 800HT alloys comprise of same concentration of nickel, chromium and iron and they show similar resistance to corrosion at the given temperature. The incoloy alloy 800H and 800HT wire are basically employed for high temperature potential and various corrosive media in which the alloys are kept for vital operations such as elevated temperature reactions including carburization and oxidation.

The resistance to corrosion in the aqueous media at the intermediate temperatures. The high concentration of nickel and chromium give the incoloy alloys superior resistance to oxidation. Theconcentration of chromium in the incoloy enhances the production of protected surface oxide and the concentration of nickel improves the security for cyclic exposure to the high temperature conditions.

The scaling resistance of the incoloy 800H and 800HT wire is noticed in the rigorous cyclic oxidations analysis at the temperature ranges of 1800oF to 2000oF. The analysis are made in the air and consecutive exposures to the above temperatures for 15 minutes and quenched in air for five minutes. The samples are set for 1000 hours for cyclic exposure with the intermittent eradication for the measuring the mass variations.

In the below table, the consequences of oxidation analysis made in the fire box of a filtration furnace are provided. The furnace was set at temperature between 1600oF to 2100oF or 870oC to 1150oC and burnt by fuel in absence of sulfur. The sample was set in to furnace for three months.

Alloy	Corrosion Rate
Alloy	mpy	mm/y
INCOLOY alloys 800H/800HT	6.0	0.15
Type 310 Stainless Steel	8.9	0.23
Type 309 Stainless Steel	84.5	2.15
Type 304 Stainless Steel	Complete oxidation

In the oxidized environment to chromium though reducing to nickel metal, the incoloy alloy can be employed for internal oxidation. The conditions that cause the rigorous embrittelment is due to wider oxidation of chromium that provides the highly magnetic alloy. The sensitivity to the internal oxidation is reduced by the inclusion of Ni – Cr alloy. The incoloy 800H and 800HT wire consist of 46% ferrous that offers higher resistance to internal oxidation.

The significant concentration of nickel in the incoloy 800H and 800HT wire provides vital resistance to carburization. In the below table the wider resistance to carburization at the temperatures of 1700oF (925oC) and 1800oF (980oC) for incoloy wires.

Alloy	Weight Gain, mg/cm(2)
	1700oF (925oC)	1800oF (980oC)
INCONEL alloy 600	2.66	-
INCONEL alloy 601	2.72	4.32
INCOLOY alloys 800H/800HT	4.94	11.6
Type 330 Stainless Steel	6.42	12.4

The below table describes the excellence of incoloy 800H and 800HT for the low concentrated nickel alloys in the 25 hours gaseous carburization analysis made at temperature of 2000oF or 1095oC.

Alloy	Weight Gain, mg/cm(2)
INCONEL alloy 600	2.78
INCOLOY alloys 800H/800HT	5.33
Type 310 Stainless Steel	18.35
Type 309 Stainless Steel	18.91

An analysis made in an atmosphere consisting of 2% methane hydrogen and its result are shown in the below table. The sample was kept for 100 hours in the carburizing conditions at the temperature of 2000°F or 1095°C. The results of incoloy 800H and 800HT wire are compared with the other alloys. The analysis conditions were comprised of 2% methane and 5% argon in hydrogen.

Alloy	Weight Gain, mg/cm(2)
INCONEL alloy 600	12.30
INCONEL alloy 601	16.18
INCOLOY alloys 800H/800HT	21.58
Type 330 Stainless Steel	24.00

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