Alloy 20 (A20)

Description

Alloy 20 resists acids, general pitting attack, and chlorideon stress corrosion cracking. Ideal for fabrication and possessing exceptional mechanical capabilities, Alloy 20 can be welded with minimal carbide precipitation due to the inclusion of columbium. A “super” stainless steel, Alloy 20 is widely accepted for uses as diverse as chemical and pharmaceutical processing, food, petrochemical and gasoline, solvents, plastics, synthetics, and explosives.

Design features

Exceptional stress-corrosion resistance in boiling 20% to 40% sulfuric acid
Sulfuric acid general corrosion resistance
Ideal fabricability and mechanical characteristics
Welding produces minimal carbide precipitation

Applications

Chemical and allied industries
Pharmaceutical processing
Food and dye
Sulfur dioxide (SO2) scrubbers
Pickling racks
Tanks
Severe environments

Product Type	Size Range	Wall/Pressure Class
Seamless Pipe	1/2” through 8”	10S, 40S (Std.), 80S (XH), 160S
Welded Pipe	3” through 12”	10S, 40S
Butt Weld Fittings	1/2” through 12”	10S, 40S (Std.), 80S (XH)
Flanges	1/2” through 12”	150, 300
Pressure Fittings	1/8” through 2”	150 lb Bar, 3000
150 lb Cast Fittings	1/2” through 2”	150
Seamless Tubing	1/8” through 1”	.035, .049, .065, .083, .095, .120
Nipples	1/4” through 2”	40S (Std.), 80S (XH)
Swages	3/8” through 4”	40S (Std.), 80S (XH)
Outlets	1/4” through 2”	10S, 40S (Std.), 80S (XH)
Valves	1/4” through 10”	150#, 300#, 1500-2000#

Alloy 20 Chemical Composition %

C	Cb	Cr	Cu	Mn	Mo	Ni	P	S	Si	Ta
MAX	8 Times			MAX			MAX	MAX	MAX	8 Times
0.07	Carbon-1.00	19.0-21.0	3.0-4.0	2.0	32.0-38.0	32.0-38.0	0.045	0.035	1.0	Carbon-1.00

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Material Grades

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