HASTELLOY C-4, Nickel-Mo-Cr alloy

Designation: HASTELLOY C-4

UNS numberN06455
US nameASTM Grade N06455
EN nameNiMo16Cr16Ti
EN number2.461
JIS (Japanese) nameNW 6455 (various standards)

Tradenames: HASTELLOY C-4
HASTELLOY C-4, Haynes International Inc. (USA)

Typical uses: HASTELLOY C-4
Chemical processing

Composition detail : HASTELLOY C-4

C (carbon)00.015%
Co (cobalt)02%
Cr (chromium)1418%
Fe (iron)03%
Mn (manganese)01%
Mo (molybdenum)1417%
Ni (nickel)57.972%
P (phosphorus)00.04%
S (sulfur)00.03%
Si (silicon)00.08%
Ti (titanium)00.7%
Other00.2%

Density: HASTELLOY C-4

Density8.6e38.7e3kg/m^3

Mechanical properties: HASTELLOY C-4

Young’s modulus207215GPa
Specific stiffness23.924.9MN.m/kg
Yield strength (elastic limit)310440MPa
Tensile strength705865MPa
Specific strength35.850.9kN.m/kg
Elongation4570% strain
Compressive strength310440MPa
Flexural modulus207215GPa
Flexural strength (modulus of rupture)310440MPa
Shear modulus7585GPa
Bulk modulus155180GPa
Poisson’s ratio0.280.3 
Shape factor28   
Hardness – Vickers170220HV
Hardness – Rockwell B8595HRB
Hardness – Rockwell C416HRC
Hardness – Brinell164207HB
Elastic stored energy (springs)234447kJ/m^3
Fatigue strength at 10^7 cycles280435MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles259470MPa

Impact & fracture properties

Fracture toughness325361MPa.m^0.5
Toughness (G)500616kJ/m^2

Thermal properties: HASTELLOY C-4

Melting point1.32e31.38e3°C
Maximum service temperature9101.04e3°C
Minimum service temperature-273  °C
Thermal conductivity911.5W/m.°C
Specific heat capacity395415J/kg.°C
Thermal expansion coefficient9.512µstrain/°C
Thermal shock resistance133201°C
Thermal distortion resistance0.8081.12MW/m
Latent heat of fusion280300kJ/kg

Electrical properties: HASTELLOY C-4

Electrical resistivity122128µohm.cm
Electrical conductivity1.351.41%IACS
Galvanic potential-0.070.01V

Processing properties: HASTELLOY C-4

Metal castingUnsuitable
Metal cold formingExcellent
Metal hot formingExcellent
Metal press formingExcellent
Metal deep drawingUnsuitable
Machining speed4.88 m/min
Weldability
Preheating and post weld heat treatments are not required
Excellent
Weldability – MIGGood
Weldability – plasmaGood
Weldability – SAWNot recommended
Weldability – TIGGood
BrazeabilityGood

Durability: HASTELLOY C-4

Water (fresh)Excellent
Water (salt)Excellent
Weak acidsExcellent
Strong acidsExcellent
Weak alkalisExcellent
Strong alkalisExcellent
Organic solventsExcellent
Oxidation at 500CExcellent
UV radiation (sunlight)Excellent
Galling resistance (adhesive wear)
Bronze or zinc alloy dies should be used to minimize galling
Limited use
FlammabilityNon-flammable

Corrosion resistance: HASTELLOY C-4

Stress corrosion cracking
Rated in chloride; Other susceptible environments: Hydroxide
Not susceptible
Intergranular (weld line) corrosionExcellent
Inorganic acidsExcellent
Organic acidsGood
AlkalisExcellent
Humidity / waterExcellent
Sea waterExcellent
Sour oil and gasExcellent

Equiavelent Grades / Similar Compositions: HASTELLOY C-4

International: NiCr16Mo16Ti to ISO 6208, NICr16Mo16Ti to ISO 9723, NiCr16Mo16Ti to ISO 9724, NiCr16Mo16Ti to ISO 9725, NiMo16Cr16Ti to ISO 6207, NW6455 to ISO 6207, NW6455 to ISO 6208, NW6455 to ISO 9723, NW6455 to ISO 9724, NW6455 to ISO 9725
Japan: NW6455 to JIS H4551, NW6455 to JIS H4552, NW6455 to JIS H4553, NW6455 to JIS H4554
UK: NA45 to BS 2901/5
USA: ERNiCrMo-7 to AWS A5.14/A5.14M, N06455 to ASTM B574, N06455 to ASTM B575, N06455 to ASTM B619, N06455 to ASTM B622, N06455 to ASTM B626, UNS N06455
Tradenames: DELORO NISTELLE C 4 C, HASTELLOY ALLOY C-4, NICROFER B 6616-WS C-4, NICROFER S 6616-FM C-4, UTP 704 KB

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