HASTELLOY ® alloy C-22 ® (UNS N06022)

HASTELLOY Alloy C-22 is a nickel-chromium-molybdenum alloy with enhanced resistance to pitting, crevice corrosion and stress corrosion cracking. It resists the formation of grain boundary precipitates in the weld-heat affected zone making it suitable for use in the as-welded condition. C-22 has outstanding resistance to both reducing and oxidizing media and because of its resistibility can be used where "upset" conditions are likely to occur. It is proven to possess excellent weldability and high corrosion resistance as consumable filler wires and electrodes. The alloy has proven results as a filler wire in many applications. As filler wire use when other corrosion resistant wires have failed.

C-22 can easily be cold-worked because of its ductility and cold-forming is the preferred method of forming. More energy is required because the alloy is generally stiffer than austenitic stainless steels. 0.28" thick sheet in the heat-treated at 2050°F

HASTELLOY® alloy C-22® (UNS N06022) Chemical composition :

Cr	Mn	C	Mo	Si	Fe
20.0~22.5	0.50	0.015	12.5~14.5	0.08	2.0~6.0

HASTELLOY® alloy C-22® (UNS N06022) Mechanical Property Requirements

	Ultimate Tensile	Yield Strength (0.2% OS)	Elong in 2 in(50.8mm) or 4D min. %	R/A	Hardness
Min	100 KSi	45 KSi	45	-	-
Max			-	-	-
Min	690 MPa	310 MPa	-	-	-
Max					-

Fabrication of Hastelloy C-22
Although ductile enough to be formed by cold working, intermediate annealing may be necessary due to work hardening. Forging should be performed between 1750-2050° F followed by rapid cooling. Annealing can be performed at a temperature range between 2020-2150° F followed by a rapid quench. Cooling at an accelerated rate avoids the formation of detrimental phases which form between 1400-1800° F. Welding can be done by gas tungsten-arc, gas metal-arc and shielded metal-arc processes.

Hastelloy C22 applications :
1.Pharmaceutical industries use alloy C-22 fittings and tubing to avoid contamination caused by 2 .corrosion related failures
3 .Cellophane manufacturing
4 .Chlorination systems
5 .Pesticide production
6 .Incineration scrubber systems
7 .Chemical process industry in equipment like flue gas scrubbers, chlorination systems, sulfur dioxide scrubbers, pulp and paper bleach plants, pickling systems, and nuclear fuel reprocessing Waste water processing

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