904L (UNS N08904 / W.Nr. 1.4539)

904L alloy (UNS N08904 / W.Nr. 1.4539) is an austenitic stainless steel designed for a middle to high level of corrosion resistance. The alloy contains high levels of chromium and nickel with additions of molybdenum and copper to provide added corrosion resistance in certain media. The alloy is produced to low carbon levels for use in the welded condition as in welded vessels and other large and complex fabrications.

Equivalent Grades

Trademark	GB	GOST	ASTM	UNS	DIN	W.Nr.	NF	BS	JIS	SS
–	–	–	AISI 904L	N08904	X1NiCrMoCu25-20-5	1.4539	–	–	–	–

Chemical Composition, %

Alloy	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	N	Fe
904L	≤0.02	≤0.70	≤2.00	≤0.030	≤0.010	19.0-21.0	24.0-26.0	4.0-5.0	1.2-2.0	≤0.15	Bal

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3	Melting Point, ℃	Tensile Strength, MPa	Yield Strength, MPa	ELongation, %	Hardness, HB
8.0	1210-1280	530-730	≥230	≥35	/

Available Products and Specifications

Rod, Bar, Wire and Forgings	ASTM B625
Plate, Sheet and Strip	ASTM A240
Pipe and Tube	ASTM A312
Welding Product	–
Others	ASTM A193, ASTM A193

Features

Non-magnetic
Stronger corrosion properties than Type 316L an 317L
Good resistance to sulphuric, phosphoric and acetic acids
High resistance to crevice and stress corrosion cracking
Excellent formability and weldability

Applications

Due to all of the benefits of using Type 904L stainless steel, it can be found in a number of applications in wide variety of critical industries including: