Alloy 20 / 904L

Alloy 20 & 904L are special Stainless (Austenitic) :

		Al20	904L
Chrome	(Cr)	20%	20%
Nickel	(Ni)	25%	29%
Molybdenum	(Mo)	2%	4.5%
Copper	(Cu)	3%	1.5%
Columbium	(Cb)	trace	-
(=Niobium,Nb)

These materials are also known as:

Alloy 20:UNS N08020, CN7M (N08007), URANUS B6M similar
904L: UNS N08904, URANUS B6

Typical Properties

Tensile 425 min N/mm2
Yield 170 min N/mm2
Elongation 35%
Hardness
Density

Corrosion Properties

Good for seawater service
Especially good for:
- General corrosion
- Erosion /corrosion
- Stress corrosion cracking
- Corrosion fatigue
- Occasional pitting will occur
Poor fouling resistance

Additional Uses & Comments

Good for sulphuric acid + wide range of acids
Extra conditions re: NACE MR0175 (AOD must be used, restrictions on chemical analysis) 22HRC max
Insulate from Copper piping