What is 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 925C.
The main application for Ni-Resist is in Gas Turbines and Automotive Exhaust and Turbocharger Systems, where temperature fluctuates between 500 and 1050C. Ni-Resist is suitable in these applications because its ductility, hot strength and low coefficient of thermal expansion provide best resistance to such severe thermal shocks.
Physical properties depend on operating temperatures and the exact nickel composition of the SG iron alloy.
The Microstructure of Ni-Resist Iron
The Microstructure of Ni-Resist Iron
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 Hardness130 � 170 HB
Guideline figures for maximum Manifold temperatures | ||
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 |