Molybdenum-nickel alloy is an alloy composed of metal molybdenum as the base element and metal element nickel.
It is one of many metal alloys.
It is mainly used under the conditions of reducing medium corrosion and is the best alloy that is resistant to hydrochloric acid corrosion.
But in the presence of oxygen and oxidants, corrosion resistance will drop significantly.
Characteristic
The carbon and silicon content of NS322 molybdenum-nickel alloy is extremely low, which reduces the precipitation of carbon and other impurity phases in the welding heat-affected zone, so its welding seam also has sufficient corrosion resistance.
NS322 molybdenum-nickel alloy has good corrosion resistance in reducing media, such as hydrochloric acid solutions of various temperatures and concentrations.
It also has good corrosion resistance in medium concentration sulfuric acid solution (or containing a certain amount of chloride ions).
It can also be used in acetic and phosphoric environments.
Alloy materials have the best corrosion resistance only when they are in the appropriate phase state and pure crystal structure.
Chemical composition (GB/T14992-2005)
Alloy grade % Ni Cr Fe Mo Co C Mn P S Cu
NS322 maximum margin 0.1 1.6 26.30
minimum margin 1.0 2.0 30.0 1.0 0.01 1.0 0.02 0.01 0.5
Mechanical properties
(Minimum value of mechanical properties measured at 20°C)
Heat treatment method Tensile strength σb MPa Yield strength σp0.2 MPa Elongation σ5 % Brinell hardness HBS
Solution treatment 745 325 40 ≥250
Physical properties
Density g/cm3 9.2
melting point °C 1330-1380
Thermal conductivity λ W/m·ºC 11.1(100ºC)
specific heat capacity J/kg·ºC 377
Elastic Modulus GPa 217
Resistivity μΩ·m 1.37
Linear expansion coefficient a 10-6-1ºC 10.3(20~100ºC)
Production standard
Standard Chemical composition bar forging plate pipe
National standard GB/T15002 GB/T15008 GB/T15008 GB/T15009 GB/T15062
GB/T15010
GB/T15012
Similar grades
Hastelloy B-2 UNS N10665 (USA), NiMo28 (France)
Application field
Nickel-containing alloys and nickel-based alloys (ie, with a nickel content of more than 50%) play an important role in corrosion-resistant applications in manufacturing, and have a wide range of applications in petrochemical, energy manufacturing, and pollution control, especially In sulfuric acid, hydrochloric acid, phosphoric acid, acetic acid and other industries.
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