Alloy 904L (Wst 1.4539)

Technical Data Sheet

Alloy 904L is an austenitic stainless steel intended for use under severe corrosion conditions, with a very good resistance to attacks in acidic environment, as sulphuric, phosphoric and acetic acid. Very good resistance to pitting corrosion, stress corrosion cracking and a much better resistance to crevice corrosion than steels of alloy 304L and alloy 316L. Used for chemical processing, pollution control equipment, oil and gas well piping, heat exchangers, acid production and pickling equipment.

Chemical Composition Limits
Weight%	Ni	Cr	Mo	Cu	Mn	Si	S	C	N
904L	23-28	19-23	4-5	1-2	2 max	1 max	0.035 max	0.020 max	0.10 max

Typical Mechanical Properties

Alloy	Tensile Strength MPa	Yield Strength (0.2% Offset) MPa	Elongation (%)
Alloy 904L Tube	500-700	200	40

Availability
Alloy 904L is available in Instrument tube, Precision tube and Hydraulic tube. On request Alloy 904L Coiled Tube can be supplied with a stainless steel seamless and welded execution. For all stock availability contact Sales.

Specifications
WS 1.4539
AFNOR Z2CNDU 25-20
UNS N08904

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Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.