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You are here: Home- NewsAustenitic 904L stainless steel feature

Austenitic 904L stainless steel feature

Posted:8/10/2016 5:05:11 AM

904L stainless steel combines molybdenum and copper with iron for tremendously increased resistance to reducing acids like sulphuric acid. It stands up extremely well to chlorides in the environment for low pitting and crevice corrosion, as well as stress corrosion cracking.

 

Chemical Composition of 904L stainless steels(%):


C
max

Cr

Cu

Mn
max

Mo

Ni

P
max

S
Max

Si
max

0.02

19.0-23.0

1.0-2.0

2.0

4.0-5.0

23.0-28.0

0.045

0.035

1.0

Mechanical properties of 904L stainless steel:


    
   Grade

 

Tensile Strength (MPa) min

 

Yield Strength 0.2% Proof (MPa) min

 

Elongation (% in 50mm) min

Hardness

Rockwell B (HR B)

Brinell (HB)

904L

490

220

36

70-90 typical

150

 

Physical properties of 904L stainless steel:

Grade

Density
(kg/m3)

Elastic Modulus
(GPa)

Mean Co-eff of Thermal Expansion (m/m/C)

Thermal Conductivity
(W/m.K)

Specific Heat 0-100C
(J/kg.K)

Elec Resistivity
(n惟.m)

0-100C

0-315C

0-538C

At 20C

At 500C

904L

7900

190

15

-

-

11.5

-

500

952

 

904L stainless steel Application:
904L is widely used in the chemical, pharmaceutical, oil and gas industries. Typical applications include tanks, valves, heat exchangers, flanges and manifolds. The addition of copper to the composition of 904L aids its suitability for components such as tanks and other products used in handling sulphuric and phosphoric acid.

 

904L stainless steel Welding:
Welding of grade 904L stainless steels can be performed using all conventional methods. This grade does not require pre-heat and post-weld heat treatments. Grade 904L can be subjected to hot cracking in constrained weldment. Grade 904L electrodes and rods are used for welding grade 904L steels according to AS 1554.6.

 

Grade 904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel is added with copper to improve its resistance to strong reducing acids, such as sulphuric acid. The steel is also resistant to stress corrosion cracking and crevice corrosion. Grade 904L is non-magnetic, and offers excellent formability, toughness and weldability.

Grade 904L contains high amounts of expensive ingredients, such as molybdenum and nickel. Today, most of the applications that employ grade 904L are replaced by low-cost duplex stainless steel 2205.

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