Products

TP 904/L - 1.4539

Wst. 1.4539

UNS N08904

Stock program: 3 – 38 mm OD / 1/8” – 1.1/2” OD

Specification: ASTM A 269/A 213/A 1016 / ASME SB-677/NACE MR0175/PED 97/23 EC

Maximum service temperature: 450°C / 824°F


904L is a low carbon high alloy austenitic stainless steel, with chromium, nickel, molybdenum and copper contents, which is widely used in applications where the corrosion properties of 316L & 317L are not adequate. Although originally developed for greatly improved resistance to strong reducing acids (particularly sulphuric acid), it also has an very high resistance to a wide range of other environments. This feature has been verified to be very successful after many years of practical applications, which has resulted in 904L being standardized in many countries.


Characteristics

  • The high Mo and the addition of copper to this grade give it greatly improved resistance to strong reducing acids, particularly sulphuric acid
  • It is highly resistant to chloride attack, both pitting crevice corrosion and stress corrosion crashing
  • Good machine ability and weldability
  • The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures

Market applications:

  • Offshore, oil & gas
  • Chemical processes
  • Seawater cooling equipment
  • Control and instrumentation
  • Pharmaceutical
  • Pulp and paper processing

Technical details

Technical composition (%)
Fe
Cr
Ni
Mo
Mn
Cu
Si
P
N
C
S
904L min
Bal.
19.0
23.0
4.0
-
1.0
0.045
-
-
-
-
  max
-
23.0
28.0
5.0
2.0
2.0
1.00
0.045
0.10
0.020
0.015
Mechanical properties
904L
Tensile strenght (mpa, min)
490 - 700
Yield strength (0.2% offset mpa, min)
220
Elongation (%, min)
35
Density / weight (g / cm3 / kg)
8.05

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