- High strength and toughness
- Excellent corrosion resistance
- Superior elevated temperature properties
Alloy 400 (UNS04400)
Characteristics
- Excellent resistance to chloride ion stress corrosion cracking.
- Good mechanical properties from subzero temperatures up to about 480C.
- Corrosion resistance in an extensive range of marine and chemical environments. From pure water to non-oxidizing mineral acids, salts and alkalis.
- This alloy is more resistant to nickel under reducing conditions and more resistant than copper under oxidizing conditions, it does show however better resistance to reducing media than oxidizing.
- Good resistance to sulphuric and hydrofluoric acids. Aeration however will result in increased corrosion rates. May be used to handle hydrochloric acid, but the presence of oxidising salts will greatly accelerate corrosive attack.
- Resistance to neutral, alkaline and acid salts is shown, but poor resistance is found with oxidizing acid salts such as ferric chloride.
Applications
- Feed water and stream generator tubing
- Brine heaters, sea water scrubbers in tanker inert gas systems
- Sulphuric acid and hydrofluoric acid alkylation plants
- Pickling bath heating coils
- Heat exchangers in a variety of industries
- Transfer piping from oil refinery crude columns
- Propeller and pump shafts
- Plant for the refining of uranium and isotope separation in the production of nuclear fuel.
- Pumps and valves used in the manufacture of perchlorethylene, chlorinated plastics.
- Monoethanolamine (MEA) reboiling tube.
- Cladding for the upper areas of oil refinery crude columns.
Size ranges
- OD 6.0-89.0mm
- WT 0.5-8.0mm
- Up to 12 meters
The tubes are strictly implements the standard specification ASTM B161/ASME SB161, ASTM B163/ASME SB163, ASTM B167/ASME SB167.
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