ASTM B165 / ASME SB165 UNS NO4400 / MONEL 400 / DIN 2.4360 NICKEL ALLOY SEAMLESS PIPE

Overview

Monel 400 is a nickel-copper alloy (about 67% Ni – 23% Cu) that is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions. Alloy 400 is a solid solution alloy that can only be hardened by cold working. This nickel alloy exhibits characteristics like good corrosion resistance, good weldability and high strength. A low corrosion rate in rapidly flowing brackish or seawater combined with excellent resistance to stress-corrosion cracking in most freshwaters, and its resistance to a variety of corrosive conditions led to its wide use in marine applications and other non-oxidizing chloride solutions.

Monel 400 has great mechanical properties at subzero temperatures, can be used in temperatures up to 1000° F, and its melting point is 2370-2460° F. However, alloy 400 is low in strength in the annealed condition so, a variety of tempers may be used to increase the strength.

Monel 400 characteristics

1. Resistant to seawater and steam at high temperatures.

2. Excellent resistance to rapidly flowing brackish water or seawater.

3. Excellent resistance to stress corrosion cracking in most freshwaters.

4. Particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated.

5. Offers some resistance to hydrochloric and sulfuric acids at modest temperatures and concentrations, but is seldom the material of choice for these acids.

6. Excellent resistance to neutral and alkaline salt.

7. Resistance to chloride induced stress corrosion cracking.

8. Good mechanical properties from sub-zero temperatures up to 1020° F.

9. High resistance to alkalis.

Specification

Chemical Composition

Mechanical Properties

Physical Properties of Monel 400