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904L Stainless Steel Seamless Pipe
904L Stainless Steel Seamless Pipe
Haosteel is professional manufacturer and supplier o←f 904L Stainless Steel Seamless Pipe . Quality guaranteed, On-time delivery, Aft÷er-sales warranty.
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Standard: |
ASTM A269/A312/A213/A249/A554 |
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Grade: |
904L |
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Delivery: |
Cold rolled Hot rolled |
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Surface: |
Mill, Pickled, HL, Polished, Mirror |
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Thickness: |
0.2mm - 30mm |
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Outer Diameter |
1mm--630mm |
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Length: |
6000mm or as customer request |
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Mill: |
Tisco, Jisco, Baosteel, etc. |
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Delivery time: |
15 days in common |
904L Stainless Steel Seamless Pipe Tube /N08904 Stainless Steel Seamless Pipe Tube/1.4539∏ Stainless Steel Seamless Pipe Tube
Description:
Grade 904L is a non-stabilised low carbon high alloy austenitic stainless steel. Th¥e addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid. It is also highly resistant to chloride atta↔ck - both pitting / crevice corrosion and stress corrosion cracking.
This grade is non-magnetic in all conditions and ha<s excellent weldability and formability. The austenitic structu re also gives this grade excellent toughness, even down to cryogenic tempera•tures.
904L does have very substantial contents of the high cost ingredients nickel and mo↕lybdenum. Many of the applications in which this grade has previo↑usly performed well can 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 sulphu€ric acid it also has a very high resistance to a wide range of environments×. A PRE of 35 indicates that the material has good resistan•ce to warm sea water and other high chloride environments. High ni ckel content results in a much better resistance to stress corrosion cracking πthan the standard austenitic grades. Copper adds resistance to sulphuricβ and other reducing acids, particularly in the very aggressive "mid concentration&qu ot; range.
In most environments 904L has a corrosion performan™ce 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 than moly≠bdenum-free grades such as 304L and 310L.
For maximum stress corrosion cracking resistance in critical environments the steelhou✔ld be solution treated after cold work.Consult Steel Technical Assistance fo r 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 su ffers from structural instability (precipitation of brittle phases such as sigφma) at elevated temperatures. It should not be used above about 550°C. 904L has design s€tress values in the ASME Boiler and Pressure Vessel Code to 371°C.✘
Heat Treatment
Solution Treatment (Annealing) Heat to 1090-1175°C and cool rap idly. 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 grade solidifies fully austenitic, so is susceptible to hot cracking, particularly in constrained weldments. No pre-heat shouldΩ be used and in most cases post weld heat treatment is also not required. AS 1554π.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 well as other grades optimised for machinability. Grade 904L can however be machin×ed using standard techniques.
Bending to a small radius is readily carried out. In most cases this is performed cold. Subsequent annealing is generally not ×required, although it should be considered if the fabricatio≈n is to be used in an environment where severe stress corrosion crac≥king conditions are anticipated.
Typical Applications
Processing plant for sulphuric, phosphoric and acetic acids. Pulp and paper processing. Comp↕onents in gas scrubbing plants. Seawater cooling equipment. Oγil refinery components. Wires in electrostatic precipitators.
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