Incoloy 800H and 800HT-Resistance to Sulfidation - Heanjia Super-metals Co., Ltd.

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Incoloy 800H and 800HT-Resistance to Sulfidation

The high concentration of chromium in the Incoloy 800H and 800HT alloy wire is the prime reason of excellent resistance to various sulfiding conditions at the elevated temperatures. The results of analysis made for concluding the weight loss due to sulfidation are shown in the below table. The loss of weight was calculated after exposure of alloys for 100 hours.

Alloy	Weight Gain, mg/cm(2)
Alloy	1110oF (600oC)	1290oF (700oC)
INCONEL alloy 601	15.6	79.3
INCOLOY alloys 800H/800HT	29.5	147.0
Type 310 Stainless Steel	32.6	138.4
Type 304 Stainless Steel	37.8	191.6

The analysis made on the effect of different nitriding on the resistance of Incoloy 800H and 800HT alloy wire has made it clear that the alloy's resistance increases with an increase in the concentration of nickel.

Though the incoloy 600 alloy consisting of 76% nickel is recommended for nitridation applications, incoloy 800H and 800HT alloy comprising of 32% nickel offer superior resistance to several nitriding conditions. In the below table the comparison of incoloy 800H and 800HT alloy with the different materials in an analysis made in the ammonia transformer. The specimen were set in the atmosphere containing 65% hydrogen and 35% nitrogen at 11 ksi (75.8 MPa) and 1000oF (540oC) for three years.

Material	Depth of Nitriding
	1 year		3 years
	in.	mm	in.	mm
Type 310 Stainless Steel	0.0088	0.224	0.0092	0.234
Type 309 Stainless Steel	0.0095	0.241	0.0096	0.244
Type 446 Stainless Steel	0.0417	1.059	0.0453	1.151
Type 304 Stainless Steel	0.0427	1.085	0.0440	1.118
INCOLOY alloys 800H/800HT	0.0054	0.137	0.0053	0.135

For heating and pickling the sample should be clean that the unnecessary materials like oil, paint, grease and shop soil should be properly removed before the heating process. The heating should be done in the lower sulfur conditions. The open heating should be performed with a fuel consisting of lower concentration of sulfur and the furnace should have reducing conditions to avoid the wider oxidation.

Due to readiness through which the Cr gets oxidized in the refractory material in air, CO2, water vapors, alloy 800 can not be intensely annealed in the common annealing furnaces. Within the restricted conditions, the incoloy alloys can be intensely annealed in the presence of pure hydrogen.

The Incoloy 800H and 800HT alloy wire are generally annealed in the box or muffle shaped furnaces under the reducing conditions. The suitable atmosphere is maintained by the burning of lower sulfur natural gas in the absence of air. It forms thin, adherent and greenblack layer of oxide on the alloy. The oxidizing conditions create a severe black scale that can not be removed easily. The eradication of this scale needs the suitable grinding process. The alloy should be pickled afterwards heating if the alloy needs the bright outer layer. Due to inherent resistance to the chemical treatments, the particular pickling methods are required to follow for Incoloy 800H and 800HT alloy wire.

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