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904L cold rolled stainless steel sheet
904L cold rolled stainless steel sheet
Haosteel is professional manufacturer and supplier of 904L cold rolled stainl¶ess steel sheet. Quality guaranteed, On-time delivery, After-sales wa↕rranty.
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Standard: |
ASTM A240 A666 |
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Grade: |
904L |
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Delivery: |
Cold rolled Hot rolled |
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Surface: |
Black/Bright/2B/BA/ NO.1/Hairline/Mirror |
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Thickness: |
0.25-3mm |
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Width: |
1m-3m |
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Length: |
2m-12m |
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Mill: |
Tisco, Jisco, Baosteel, etc. |
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Delivery time: |
15days in common |
904L Stainless steel sheet plate/N08904 Stainless steel sheet plate/1.4539 Stainless steel shσeet plate
Description:
Grade 904L is a non-stabilised low carbon high alloy ausσtenitic stainless steel. The addition of copper to §this grade gives it greatly improved resistance to strong÷ reducing acids, particularly sulphuric acid. It is also highly resistant to c✔hloride attack - both pitting / crevice corrosion and stress corrosion cracking.
This grade is non-magnetic in all conditions and has excellent weldabi®lity and formability. The austenitic structure also gives this £grade excellent toughness, even down to cryogenic temperatures.
904L does have very substantial contents of the highλ cost ingredients nickel and molybdenum. Many of the applications in which this grade ha♣s previously performed well can now be fulfilled at lower cost by duplex Ωstainless 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 very high res♥istance to a wide range of environments. A PRE of 35 indicates that the ma•terial has good resistance to warm sea water and other high ÷chloride environments. High nickel content results in a much better resΩistance to stress corrosion cracking than the standard austenitic grades. Copper adds resistance t¥o sulphuric and other reducing acids, particularly in the very aggressive "mid cσoncentration" range.
In most environments 904L has a corrosion performance intermediate between the standa∏rd austenitic grade 316L and the very highly alloyed 6% molybdenum and similar "₽super austenitic" grades.
In aggressive nitric acid 904L has less resistance than molybdenum-free grades such as 30<4L and 310L.
For maximum stress corrosion cracking resistance in cr×itical environments the steelhould be solution treated after cold work.Consult Steel Techni↑cal Assistance for specific environmental recommendations.
Chemical composition:
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Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
Cu |
N |
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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
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Grade |
Tensile Strength (MPa)min |
Yield Strength 0.2% Proof (MPa)min |
Elongation (% in 50mm) min |
Hardness |
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Rockwell B (HRB)max |
Brinell (HB) |
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904L |
490 |
220 |
35 |
90 |
- |
Physical Properties (typical values in the annealed condition)
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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) |
|||
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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) |
|||||
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904L |
8000 |
200 |
15.0 |
- |
- |
13.0 |
- |
500 |
850 |
Grade Specification Comparison
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Grade |
UNS No |
Euronorm |
Swedish SS |
Japanese JIS |
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No |
Name |
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904L |
N08904 |
1.4539 |
X1NiCrMoCu25-20-5 |
2562 |
- |
Heat Resistance
Good resistance to oxidation, but like other highly alloyed grades suffer♥s from structural instability (precipitation of brittle phases such as sigma) at elevated tem↕peratures. It should not be used above about 550°C. 904L has design stress values inΩ the ASME Boiler and Pressure Vessel Code to 371°C.
Heat Treatment
Solution Treatment (Annealing) Heat to 1090-1175°C and cool rapidly. This gra∏de cannot be hardened by thermal treatment.
Welding
904L can be successfully welded by all standard metho♥ds. Care needs to be taken as this grade solidifies fully austen≠itic, so is susceptible to hot cracking, particularly in constrained weldments∑. No pre-heat should be used and in most cases post weld heat treatment is also not reqΩuired. AS 1554.6 pre- qualifies Grade 904L rods and electrodes δfor welding of 904L.
Fabrication
904L is a high purity, low sulphur grade, and as such will not machine as well as other gr£ades optimised for machinability. Grade 904L can however be machined usinδg standard techniques.
Bending to a small radius is readily carried out. In most cas↔es this is performed cold. Subsequent annealing is generally no€t required, although it should be considered if the fabricatio®n is to be used in an environment where severe stress corrosion cracking® conditions are anticipated.
Typical Applications
Processing plant for sulphuric, phosphoric and acetic acids. P∑ulp and paper processing. Components in gas scrubbing plants. Seawater c ooling equipment. Oil refinery components. Wires in electrostatic ₽precipitators.
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