Hastelloy C-4

This Nickel-Chromium-Molybdenum alloy tolerates high temperatures and gives a design freedom in areas where weld geometry makes excessive heat build-up unavoidable. Resistance to general and localised corrosion and stress corrosion cracking is generally similar to Hastelloy C-276.

Good Mechanical Properties at Elevated Temperatures No
Corrosion Resistant at Ambient Temperatures Yes
Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures No
Oxidation Resistant No
Precipitation Hardenable No

Applications include:

  • Chemical processing
Approximate Chemical Composition
Ni 65%
Cr 16%
Mo 16%
Fe 3% max
Co 2% max

 

Properties
DENSITY 8.64 g/cm3 0.312 lb/in3
MELTING POINT 1399oC 2550oF
COEFFICIENT OF EXPANSION 10.8 µm/m °C 
(20 – 100°C)
6.0 x 10-6 in/in °F
(70 – 212°F)
MODULUS OF RIGIDITY 81.2 kN/mm2 11777 ksi
MODULUS OF ELASTICITY 212.4 kN/mm2 30807 ksi

 

CONDITION OF SUPPLY HEAT TREATMENT (AFTER FORMING)
Annealed/Spring Temper Stress relieve at 400 – 450oC (750 – 840oF) for 2 hours and air cool.

 

CONDITION APPROX TENSILE STRENGTH APPROX SERVICE TEMPERATURE
Annealed 800 – 1100 N/mm2 116 – 159 ksi -200 to +400oC -330 to +750oF
Spring Temper 1300 – 1500 N/mm2 189 – 218 ksi -200 to +400oC -330 to +750oF