It is an alloy that has great resistance to corrosion and cracking in chemicals that contain sulfuric, nitric, and phosphoric acids, as well as chlorides. It is used for piping, tanks, pumps, valves, heat exchangers and other process equipment.

Types of materials sold by Steel Chandler in Alloy Steel 20:

Pipes
Fittings
Flanges

Specifications
UNS N08020

Seam Pipe	6"-12"	10s, 40s	ASTM/ASME 464
Seamless Pipe	1/2"-8"	10s, 40s, 80s, 160, XXH	ASTM/ASME 729
B/W Fittings	1/2"-12"	10s, 40s, 80s, S160	ASTM/ASME 366
Flanges	1/2"-12"	150#, 300#, 600#	ASTM/ASME 462
Pressure Fittings	1/2"-2"	3000# THRD/SW	ASTM/ASME 462

Chemical composition - %

Ni	32.0-38.0	Nb	1.0 max.
Fe	Remainder	C	0.07 max.
Cr	19.0-21.0	Mn	2.0 max.
Cu	3.0-4.0	P	0.045 max.
Nb+Ta	8 x C-1.0	S	0.035 max.
Mo	2.0-3.0	Si	1.0 max.