highly corrosion-resistant steel
1.4539 is a highly corrosion-resistant, austenitic steel with a high resistance to a number of organic and inorganic acids. It has a high resistance to pitting corrosion and stress cracking corrosion.
1.4539 in use
This grade can also be used for media containing chloride, sea water, sulphuric and phosphoric acid solutions.
1.4539 is susceptible to the formation of hot cracks, on the other hand the material can be easily welded with all methods.
Assignment to current and older standards
- Designation according to DIN: X 1 Ni Cr Mo Cu N 25-20-5
- ASTM grade: 904 L
- EN: 1.4539
- ASME: 904 L
- AFNOR: X1NiCrMoCu 25-20-5
- SIS: 2562
- UNS: N 08904
- SEW 400(91´): 1.4539
- Vd TÜV 421: 1.4539
Chemical composition reference analysis (as weight %)
|Cr||19 – 21|
|Mo||4 – 5|
|Ni||24 – 26|
|Cu||1,0 – 2,0|
Mechanical values at room temperature
|Tensile strength N/mm²||520 – 720|
|Tensile yield point Rp 0,2 N/mm²||≥ 220|
|Elongation at break A5 %||35|