Stainless Steel 904L is a high-alloy austenitic stainless steel with low carbon content. The grade is intended for use under severe corrosive conditions. It has been application proved over many years and was originally developed to resist corrosion in dilute sulfuric acid. It is standardized and approved for pressure vessel use in several countries.
Stainless Steel 904L grade is non-magnetic in all conditions and has excellent formability and weldability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures.
Specifications
The following specifications cover Stainless Steel 904L
- AFNOR Z2CNDU 25-20
- ASTM B625
- ASTM B649
- ASTM B673
- ASTM B674
- ASTM B677
- DIN 1.4539
- UNS N08904
Related Metals:
- VLX904(tm)
- AL 904L(tm)
- Cronifer 1925 LC(tm)
Chemistry Data :
Carbon
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0.02 max
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Chromium
|
19 - 23
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Copper
|
1 - 2
| |
Iron
|
Balance
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Manganese
|
2 max
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Molybdenum
|
4 - 5
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Nickel
|
23 - 28
| |
Phosphorus
|
0.045 max
| |
Silicon
|
1 max
| |
Sulphur
|
0.035 max
|
| Principal Design Features | | Stainless Steel 904L is an austenitic stainless steel designed for moderate to high corrosion resistance. Its low carbon content improves cleanliness and weld strength. |
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| Applications | | Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining,Sewage treatment, Natural gas and Pressure vessels. |
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| Machinability | | Slow speeds and positive feeds will minimize this alloy's tendency to work harden and glaze. Use chip breakers where possible to overcome problems with long draggy chips. |
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| Welding | | Most common fusion and resistance methods may be employed. For maximum corrosion resistance, it is recommended to use filler metals of equal or higher alloy content. |
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| Hot Working | | Hot work should proceed after uniform heating to 2000-2200 F. Doe not work the material at less than 1800 F. Full annealing should follow any hot work to reattain maximum ductility and corrosion resistance. |
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| Cold Working | | Although higher forces are required, 904L will respond in a similar fashion to other austenitic stainless steels like 304, 316 or 317. Most common operations can be successfully performed. |
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| Annealing | | 1920-1990 F (1050-1090 C), rapid cooling. |
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| Hardening | | This alloy does not respond to heat treatment.. It may only be hardened by cold reduction. |
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Physical Data :
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| Density (lb / cu. in.) | 0.285 |
| Specific Gravity | 7.9 |
| Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) | 0.12 |
| Electrical Resistivity (microhm-cm (at 68 Deg F)) | 480 |
| Modulus of Elasticity Tension | 28.4 |
Source: Yaang Pipe Industry (www.yaang.com)
