Alloy 904L UNS N08904   

UNS NO8904, commonly known as 904L, is a low carbon high alloy austenitic stainless steel which is widely used in applications where the corrosion properties of AISI 316L and AISI 317L are not adequate.

Alloy 904L has a high resistance to pitting in chloride solutions, a high resistance to both crevice and stress corrosion cracking. This grade performs better than other austenitic stainless steels due to the higher alloying of nickel and molybdenum. Alloy 904L is particularly useful in control and instrumentation tubing applications where 316 and 317L are not suitable.

 

Typical Manufacturing Specifications
UNS N08904 ASTM A213 ASTM A269 ASTM A312

 

Ni
Cr
Mo
Cu
Mn
Si
S
C
N
Nickel
Chromium
Molybdenum
Copper
Manganese
Silicon
Sulfur
Carbon
Nitrogen
23-28
19-23
4-5
1-2
2 (Max)
1 (Max)
0.035 (Max)
0.020 (Max)
0.10 (Max)

 

Typical Applications

Offshore Oil/Gas Productions Control and Instrumentation – Seawater
Cooling Equipment – Chemical Processing for Sulphuric, Phosphoric
and Acetic Acids – Condenser Tubes – Heat Exchangers

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