Sulfidation resistance of Inconel 601 Wire - Heanjia Super-metals Co., Ltd.

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Sulfidation resistance of Inconel 601 Wire

The resistance to sulfidation of inconel 601 wire in the presence of hydrogen sulfide and hydrogen is highest at the temperature of 1200oF to 1400oF or 650oC to 760oC. The loss of weight determines the complete degradation of sample after hundred hour introduction to open atmosphere.

The inconel 601 alloy wire is easily produced and machined and welded by following the standard processes. The welding forms are introduced that offer the comparative functionality over the base material in the entire service conditions. Just like the standard nickel alloys consist of high nickel content that should be cleaned before it is warmed up.

The unnecessary materials like grease, oil and dust should be eradicated from the material prior to heating. The alloy is heated in the condition of lower concentration of sulfur. The fuel for open heating should consist of lower quantity of sulfur. In order to avoid the massive oxidation of alloy, the furnace conditions should be minimized slowly.

The inconel 601 alloy is not forced by heat processing. The wide range of forces and hardness that can be obtained with the alloy by the mixture of cold processing and annealing. The magnitude of work and the part dimension of the material is considered to follow the annealing method. The impact of annealing temperature on the tensile strength of cold treated inconel alloy is shown in the below table:

Annealing Temperature °F	Tensile Strength, ksi	Yield Strength, ksi	Elongation%
1750	174.0	166.0	5
1800	114.0	56.5	32
1850	113.5	53.5	34
1900	105.0	43.0	37
1950	107.0	41.0	36
2000	104.0	43.0	39

The alloy is annealed at the given temperatures for two minutes and water cooled.

The presence of aluminum and chromium offers inconel 601 alloy capability to produce the refractory surface oxide while heating that can not be annealing in the commercial used furnaces. The pickling is essential to produce the bright layers on the alloy sections that are heated. The specialized pickling processes are essential for alloy 601 due to its resistance to the chemical processes. The light oxide on the material that are annealed and cooled in absence of air can be eradicated by the nitric or hydrochloric acid solution as shown in the below table:

Process	Solution Temperature	Immersion Time
Immerse in solution of:20-25% Nitric Acid 1½-2% Hydrofluoric Acid 2-3% Sodium Chloride Balance Water	130°F (54°C)	10-20 min
Water Rinse	140°F (60°C)	-
Immerse in solution of:15-20% Sodium Hydroxide 3-5% Potassium permanganate Balance Water	190-200°F (88-93°C)	1-2 hr
Immerse in solution of Step1	130°F (54°C)	10-20 min
Water Rinse	140°F (60°C)	-
Immerse in solution of:2-3% Ammonium Hydroxide Balance Water	70°F (21°C)	3-5 min
Water Rinse	140°F (60°C)	-

The rate of cooling after the heating has minor effects on the mechanical features of inconel 601 wire. But if the alloy is to be pickled or open in the rigorous conditions, it is quenched quickly through the 1000 – 1400oF or 540oC to 760oC temperature to prevent the sensitization.

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