PRODUCT CENTER
904L Stainless Steel Welded Pipe
904L Stainless Steel Welded Pipe
|
Standard:
|
ASTM A269/A312/A213/A249/A554
|
|
Grade:
|
904L
|
|
Delivery:
|
Cold rolled Hot rolled
|
|
Surface:
|
Mill, Pickled, HL, Polished, Mirror
|
|
Thickness:
|
0.2mm - 30mm
|
|
Outer Diameter
|
1mm--930mm
|
|
Length:
|
6000mm or as customer request
|
|
Mill:
|
Tisco, Jisco, Baosteel, etc.
|
|
Delivery time:
|
15 days in common
|
904L Stainless steel welded pipe tube/N08904 Stainless steel welded pipe tube/1.4539 Stainless steel welded pipe tube
Description:
Grade 904L is a non-stabilised low carbon high alloy austenitic stainless← steel. The addition of copper to this grade gives it greatly improved resistance to st rong reducing acids, particularly sulphuric acid. It is also highly resistant to chloride attack - both pitting / crevice corrosion and stress corrosion cracking.
This grade is non-magnetic in all conditions and has excellent welda→bility and formability. The austenitic structure also gives this grade excellent toughness™, even down to cryogenic temperatures.
904L does have very substantial contents of the high cost ingredients nick←el and molybdenum. Many of the applications in which this grade has previously performed well ca±n now be fulfilled at lower cost by duplex stainless steel 2205 (S31803 or S32205), so 904L is used♣ less commonly than in the past.
Corrosion Resistance
Although originally developed for its resistance to sulphuric acid it also has a veδry high resistance to a wide range of environments. A PRE of 35 indicates th↑at the material has good resistance to warm sea water and other high chloride environm€ents. High nickel content results in a much better resistance to stress corrosion cracking than the standard austenitic grades. Copper adds resistance to sulphu≈ric and other reducing acids, particularly in the very aggressive "mid concentration"₽; range.
In most environments 904L has a corrosion performance intermediate between the standard austenitic grade 316L and the very highly alloyed↑ 6% molybdenum and similar "super austenitic" grades.
In aggressive nitric acid 904L has less resistance tha¶n molybdenum-free grades such as 304L and 310L.
For maximum stress corrosion cracking resistance in critical environments the steelh←ould be solution treated after cold work.Consult Steel Technical Assistance for specific ∞environmental recommendations.
Chemical composition:
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
Cu |
N |
|
|
904L |
min. max. |
- 0.020 |
- 2.00 |
- 1.00 |
- 0.045 |
- 0.035 |
19.0 23.0 |
4.0 5.0 |
23.0 28.0 |
1.0 2.0 |
- 0.10 |
Mechanical Property Specification
|
Grade |
Tensile Strength (MPa)min |
Yield Strength 0.2% Proof (MPa)min |
Elongation (% in 50mm) min |
≤Hardness |
|
|
Rockwell B (HRB)max |
Brinell (HB) |
||||
|
904L |
490 |
220 |
35 |
90 |
- |
Physical Properties (typical values in the annealed¥ condition)
|
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion |
Thermal Conductivity |
Specific Heat 0-100°C ( J/kg.K) |
Electrical Resistivity (nW.m) |
|||
|
0-100°C (mm/m/°C) |
0-315°C |
0-538°C (mm/m/°C) |
at 20°C (W/m.K) |
at 500°C (W/m.K) |
|||||
|
904L |
8000 |
200 |
15.0 |
- |
- |
13.0 |
- |
500 |
850 |
Grade Specification Comparison
|
Grade |
UNS No |
Euronorm |
Swedish SS |
Japanese JIS |
|
|
No |
Name |
||||
|
904L |
N08904 |
1.4539 |
X1NiCrMoCu25-20-5 |
2562 |
- |
Heat Resistance
Good resistance to oxidation, but like other highly alloyed grades suffers from structural inst≈ability (precipitation of brittle phases such as sigma) at elevated temperatu↑res. It should not be used above about 550°C. 904L± has design stress values in the ASME Boiler and Pres×sure Vessel Code to 371°C.
Heat Treatment
Solution Treatment (Annealing) Heat to 1090-1175°C and cool ra£pidly. This grade cannot be hardened by thermal treatment.
Welding
904L can be successfully welded by all standard methods. Care needs to be taken as this gΩrade solidifies fully austenitic, so is susceptible to hot cracking, particularly in constrain↔ed weldments. No pre-heat should be used and in most cases post weld heat treatment is also not r©equired. AS 1554.6 pre- qualifies Grade 904L rods and electrodes for welding of 904L.
Fabrication
904L is a high purity, low sulphur grade, and as such will not machine as w♦ell as other grades optimised for machinability. Grade 904L can however be machined using standardδ techniques.
Bending to a small radius is readily carried out. In most cases this is performed cold. S✘ubsequent annealing is generally not required, although it should be consi≠dered if the fabrication is to be used in an environment where ↓severe stress corrosion cracking conditions are anticδipated.
Typical Applications
Processing plant for sulphuric, phosphoric and acetic acids. Pulp and paper processing. Components in gas scrubbing plants. Seawater cool♦ing equipment. Oil refinery components. Wires in electrostatic precipitators.
© Haosteel Group Co., Limited 京ICP證000000号-2
Website Construction: www.300.cn