Description
Alloy 400 is a nickel-copper solid solution strengthened alloy. The alloy is characterized by moderate strength, good weldability, good general corrosion resistance and toughness. It is useful at temperatures up to 1000°F (538°C). Alloy 400 has excellent resistance to rapidly flowing brackish or seawater where cavitation and erosion resistance is necessary. It is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated. Alloy 400 is slightly magnetic at room temperature.
Applications
Some typical applications for alloy 400 are:
• Chlorinated solvents
• Crude oil distillation towers
• Ethyl chloride purification
• HF alkylation
• HF reboilers
• Marine components
• Marine splash zone sheathing
• MEA reboilers
• Oil well recovery pumps
• Salt production
• Salt residual compounds
• Shafting
• Wire netting for insulation
Corrosion Resistance
Alloy 400 is virtually immune to chloride ion stress corrosion cracking in typical environments. Generally, its corrosion resistance is very good in reducing environments, but poor in oxidizing conditions.
Alloy 400 is resistant to most alkalis, salts, waters (including saline or brackish), food products, organic substances and atmospheric conditions at normal and elevated temperatures.
This alloy is not useful in highly oxidizing acids, such as nitric and nitrous. It is resistant to sulfuric acid in concentrations to 80% and in hydrochloric solutions in concentrations to 20%.
Oxidizing impurities such as ferric chloride, ferric sulfate, chromates, nitrates, peroxides, and cupric salts, can cause attack in a medium which would otherwise be relatively mild for the alloy.
Type Analysis
Element Min Max
Carbon - 0.3
Nickel 63.0 70.0
Iron -- 2.5
Silicon -- 0.5
Manganese -- 2.00
Sulfur -- 0.024
Copper 28.0 34.0
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
