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Super Austenitic 904L

 
904L(UNS N08904)
 
 
Characteristic:
904L is a very low carbon containing high alloy austenitic stainless steel. The steel designed for the harsh corrosion conditions. 904L has been standardized in many countries now, and have already been approved in the manufacture of pressure vessels. 904L alloy with the same used as CrNi austenitic steel, has a good resistance to pitting and crevice corrosion capabilities, very high stress corrosion cracking capacity, good intergranular corrosion resistance property, good processability and Solderability. The highest temperature heating up to 1180 centigrade degree when hot forging, the lowest temperature stop forging not less than 900 centigrade degree. This steel may hot forming during1000 - 1150 centigrade degree. The steel heat treatment process is 1100 - 1150 centigrade degree, cold fast afrer heated. Although this may use common steel welding technology for welding, but the best way are manual arc welding and TIG welding. When using manual arc welding, the welding rod diameter should no more than 2.5 mm when welding 6 mm plate; the welding rod diameter is less than 3.2 mm when the thickness is greater than 6 mm. When need to heat treatment after welding, can fast-cooling after heat in 1075 - 1125centigrade degree. When useTIG welding, the filling metal can use with the same material, seam is subject to pickling,passivatingtreatment after the welding.

 

Forms of 253 MA Available 
Sheet
Plate
Bar
Pipe
Welding Material: Bare Weld Wire

 


Applied field:
 
Alloy 904L is a multi-purpose material can be applied in many industrial :
1. Petroleum, petrochemical equipment, such as the reactor in petrochemical equipment.
2. Sulfuric acid storage and transportation equipment, such as heat exchanger.
3. Power plant flue gas desulphurization equipment, the main parts: the absorption tower, flue , stopping plate, internal part, spray system.
4. The scrubber and the fans in the organic acid treatment system.

904L Chemical compositon


Alloy

%

Ni

Cr

Mo

Cu

Fe

C

Mn

Si

P

S

904L

Min.

23

19

4

1

Balance

 

 

 

 

 

Max.

28

23

5

2

0.02

2

1

0.045

0.035


 
904L Physical properties:

Density

8.0 g/cm3

Melting point

1300-1390


 
904L Alloy minimum mechanical properties in the room temperature:
Status
Tensile strength
Rm N/mm2
Yield strength
RP0.2N/mm2
Elongation
A5 %
904L
490
216
35
 

Alloy

%

Ni

Cr

Mo

Cu

Fe

C

Mn

Si

P

S

904L

Min.

23

19

4

1

Balance

 

 

 

 

 

Max.

28

23

5

2

0.02

2

1

0.045

0.035


 
904L Physical properties:

Density

8.0 g/cm3

Melting point

1300-1390


 
904L Alloy minimum mechanical properties in the room temperature:
Status
Tensile strength
Rm N/mm2
Yield strength
RP0.2N/mm2
Elongation
A5 %
904L
490
216
35
 
 
 
 
Date:2011/1/10
Last:304 Diamond Plate(Belgium)
Next:254SMo

 

 

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