What is the difference between Monel 400 and alloy 400?
Monel 400 is a nickel-copper alloy (approximately 67% Ni - 23% Cu) resistant to high temperatures in seawater and steam as well as salt and caustic solutions. Alloy 400 is a solid solution alloy that can only be hardened by cold working. This nickel alloy has good corrosion resistance, good weldability and high strength. It has low corrosion rates in fast-flowing saltwater or seawater, excellent resistance to stress corrosion cracking in most freshwaters, and its resistance to a variety of corrosive conditions makes it widely used in marine applications and other non- Oxidizing chloride solution.
This nickel alloy is particularly resistant to hydrochloric and hydrofluoric acids after degassing. As expected from its high copper content, Alloy 400 is rapidly attacked by nitric acid and ammonia systems.
Monel 400 has excellent mechanical properties in sub-zero temperatures and can be used at temperatures up to 1000° F. It has a melting point of 2370-2460° F. However, Alloy 400 has lower strength in the annealed condition, so there are various tempering states that can be used to increase strength.
What forms of Monel 400 does Mega Mex offer?
sheet
plate
bar
Pipes and Tubes (Welded and Seamless)
Accessories
Elbows, tees, short pipe ends, return pipes, pipe caps, crosses, reducers, pipe joints. ETC.
metallic line
What are the characteristics of Monel Alloy 400?
Resistant to high temperature sea water and steam
Excellent resistance to fast flowing salt or sea water
Excellent resistance to stress corrosion cracking in most freshwaters
Particularly resistant to hydrochloric acid and hydrofluoric acid after degassing
Has some resistance to hydrochloric and sulfuric acids at moderate temperatures and concentrations, but is rarely the material of choice for these acids
Excellent resistance to neutral and alkaline salts
Resistant to chloride-induced stress corrosion cracking
Good mechanical properties from sub-zero temperatures to 1020° F
High alkali resistance
Corrosion-resistant Monel 400
Alloy 400 is virtually immune to chloride ion stress corrosion cracking in typical environments. Generally, its corrosion resistance is very good under reducing environments, but its corrosion resistance is poor under oxidizing conditions. It does not work with oxidizing acids such as nitric acid and nitrous acid. However, it is resistant to most alkalis, salts, water, foods, organic matter, and atmospheric conditions at normal and elevated temperatures.
This nickel alloy will attack in sulfur-containing gases above about 700° F, and molten sulfur will attack the alloy at temperatures above about 500° F.
Monel 400 has approximately the same corrosion resistance as nickel, but has higher maximum operating pressures and temperatures, and is less expensive due to its superior processing capabilities.
What applications is Monel 400 used for?
Marine Engineering
Chemical and hydrocarbon processing equipment
Gasoline and fresh water tanks
crude oil still
Degassing heater
Boiler feed water heaters and other heat exchangers
Valves, pumps, shafts, fittings and fasteners
Industrial heat exchanger
Chlorinated solvent
Crude oil distillation tower
