904L/AISI 904L/ALLOY 904L
UNS N08904 also know as 904L falls in the austenitic stainless steel group. It has high
molybdenum and extremely low carbon content .Copper content in the alloy greatly improves
resistance to strong reducing acids, especially (H2SO4) sulphuric acid.904L has better
resistance ti chloride attack against both stress corrosion cracking and crevice / pitting
corrosion . With excellent weldability and formability 904L also maintain non-magnetic state
in all conditions.904L provides excellent toughness , even down to cryogenic temperatures
with its austenitic structure.
Material Notes:Iron content above calculated as balance. Allegheny Ludlum AL 904 L Alloy
(UNS N08904) is an austenitic stainless steel alloy designed for a middles to high level of
corrosion resistance. The alloy is produced to low carbon levels for use in the welded condition
as in welded vessels and other large and complex fabrications. The high nickel (25%) and molybdenum
(4.5%) contents of the AL 904L alloy provide good resistance to chloride stress corrosion cracking,
although not total resistance as judged by the extremely severe laboratory test, boiling magnesium
chloride. The N08904 alloy has been incorporated in ASTM and ASME specifications, and is widely and
readily available in a variety of product forms, welding electrodes, and fittings. The AL 904L Alloy
has performed well in a variety of service environments such as utility scrubbers, acid and fertilizer
production.
Specifications
| Standard |
904L |
| UNS |
N08904 |
| Werkstoff Nr. |
1.4539 |
Mechanical & Physical Properties
| Density |
8.05 g/cm3 |
| Melting Point |
1350 °C (2460 °F) |
| Tensile Strength |
Psi-71000 ,MPa-490 |
| Yield Strength (0.2%Offset) |
Psi-32000 ,MPa-220 |
| Elongation |
35 % |
Chemical Composition
| |
Alloy 904L |
| Ni |
23-28 |
| Mo |
4-5 |
| Cr |
19-23 |
| Cu |
1-2 |
| C |
0.02 max |
| Mn |
2.0 max |
| Si |
1.0 max |
| P |
0.045 max |
| S |
0.035 max |
Application
Oil & Gas Industry
Chemical Industry
Paper & Pulp Industry
