Hastelloy C-4^* Specification
*Trade name of Haynes International

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

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