904L, 1.4539, N08904, Austenitic Pipe/Tube, Flanges, Fittings

904L is an austenitic stainless steel. In comparison to 316L, its molybdenum addition gives it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids and in particular its copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid. Its high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible. Its low carbon content makes it resistant to sensitization by welding and which prevents intergranular corrosion.


It has applications in piping systems, pollution control equipment, heat exchangers, and bleaching systems


Composition

Nickel, 23–28%

Chromium, 19–23%

Carbon, 0.02% maximum

Copper, 1–2%

Molybdenum, 4–5%

Manganese, 2% maximum

Silicon, 1.0% maximum

Iron, (balance)


904L （1.4539）









Summary

1.4539 (alloy 904L) is an austenitic special steel with high molybdenum content as well as addition of copper and extremely low carbon content.








Standard Product Forms

 








Chemical Composition Wt,%

 

Min

Max.

 

Min.

Max.

Min.

Max.

Ni

23

28

Cu

1.0

2.0

C

0.02


Cr

19

23

Co

 

 

Si

1.0


Fe

 

 

Al

 

 

P

0.04


Mo

4

5

Ti

 

 

S

0.03


W

 

 

Mn

 

2.0

N

 


Physical

Constants

Density,g/ 8.24








Melting Range,℃









Typical Mechanical Properties

Elastic

Modulus

(Gpa)

200







Mean Co-eff of Thermal

Expansion (μm/m/℃)

0-100℃

15







0-315℃

 








0-538℃

 








Thermal Conductivity

(W/m.k)

At 20℃

13







At 500℃

 








Specific Heat

0-100 ℃

(J/Kg.K)

500








Elec Resistivity

(nΩ.m)

850








Tensile Strength (Mpa) min

490








Yield Stregth 0.2%

Proof (Mpa) min

220








Elongation (% in 50 MM)

min

35








We have products:

904L seamless tube steel tube; 1 / 4 Inch Sch10s TP347 / 347H Stainless Steel Welded Multi-core Coiled Tubing; 3 / 4 Inch Sch40s Precision Stainless Steel Tube, TP347 / 347H Seamless Tube; ASTM A182 F904L Flange, Stainless Steel 904L Flanges;
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