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Technical Data
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Ductile Ni-Resist Iron

By alloying SG iron with Nickel, a stable austenitic nodular iron is produced, giving excellent resistance to growth and oxidation up to 925ºC.

The main application for Ni-Resist is in Gas Turbines and Automotive Exhaust and Turbocharger Systems, where temperature fluctuates between 500 and 1050ºC.  Ni-Resist is suitable in these applications because its ductility, hot strength and low coefficient of thermal expansion provide best resistance to such severe themal shocks.

Physical properties depend on operating temperatures and the exact nickel composition of the SG iron alloy. However typical values for the austenitic Ni-Resist grade D5S are detailed below:

Castings PLC Ni-Resist Ductile Iron conforms to:
ASTM AS71:1984, grade D5S
BS 3468:1986
DIN 1694: GGG-NiSiCr35.5.2

Typical Chemical Composition

C 2.0% max
Si 4.0 – 6.0%
Mn 0.5 – 1.5%
Ni 34.0 – 36.0%
Cr 1.5 – 2.5%
P 0.08% max
Cu 0.50% max

Mechanical Properties

Tensile Strength (Rm) 380 – 500 N/mm2
Proof Stress (Rp0.2) 210 – 270 N/mm2
Elongation (A) 10 – 20 %
Modulus of Elasticity (E) 130 to 150 kN/mm2
Brinell Hardness 130 – 170 HB

Ni Resist Microstructure

Guideline figures for maximum Manifold temperatures

Material Grade Max. Manifold Temp. °C Max. Exhaust Gas Temp. °C
SG400/15 700 770
SiMo 0.5% 750 820
SiMo 1% 780 820
SiMo Ni 795 835
Ni Resist D5S 870 950
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