Both Ni Hard and Ni Resist are high performance alloy cast irons, but their design goals and applications are drastically different:
Ni-Hard is designed for impact resistance and wear resistance, performing exceptionally well in harsh working conditions and earning the title of “wear-resistant champion.”
Ni-Resist, on the other hand, excels in corrosion resistance and high-temperature resistance, maintaining stable performance in harsh chemical environments and at high temperatures, making it a true “corrosion and heat resistant guardian.”
Chemical Composition and Microstructure
The performance differences between these two materials stem from their different chemical compositions and the resulting microstructures.
Ni-Hard: It has a martensitic matrix, with nickel (Ni) and chromium (Cr) as the main alloying elements. Nickel improves the material’s hardenability, ensuring the formation of a hard martensitic matrix; chromium inhibits graphite precipitation and forms hard chromium carbides, together contributing to its extremely high hardness.
Ni-Resist: It has an austenitic matrix with a significantly higher nickel (Ni) content than Ni-Hard, typically ranging from 13% to 36%, which is crucial for achieving a stable austenitic matrix. Some grades also add chromium (Cr) or copper (Cu) to further optimize specific properties.
Typical Applications
Based on these characteristics, they play key roles in various industrial scenarios.
Typical Applications of Ni-Hard (Wear-Resistant Applications)
Mining and Material Handling: Used for liners, crusher hammers, jaw crusher jaw plates, ball mill liners, grinding media, grinding rollers, etc.
Power Industry: Used in components for pulverized coal mills.
General Industry: Used in mud pumps, chute liners, etc.
Typical Applications of Ni-Resistant (Corrosion/Heat Resistance Applications)
Chemical and Shipbuilding Industries: Used in corrosion-resistant components such as chemical pumps, valves, seawater pumps, and impellers.
Automotive Industry: Used in heat-resistant components such as turbocharger housings, exhaust manifolds, and catalytic converter housings.
Oil & Gas Industry: Used in pipeline valves, etc.
Other Fields: Also used in hydraulic and pneumatic components.
To meet the nuanced requirements of different operating conditions, both have developed multiple sub-grades. Common Ni-Hard grades include 1, 2, and 4, while Ni-Resist has many more, such as Type 1 to Type 5 (flake graphite) according to ASTM A436 standards, and Type D-2, D-2B, and D-5 (spheroidal graphite) according to ASTM A439 standards.
The specific composition and properties vary between different grades. For example, to achieve higher wear resistance, Ni-Hard 4 has significantly higher chromium content (up to 7.0-11.0%) and nickel content (up to 6.0-8.0%) than Ni-Hard 1. Ni-Resist Type 5, designed for superior corrosion resistance in harsh chemical environments, boasts a nickel content as high as 32-36%.
While both contain nickel, one is designed for extreme wear resistance, while the other prioritizes resistance to corrosion and high temperatures. The key to material selection lies in clearly defining whether the primary challenge facing the component is wear or corrosion/high temperature.
These are the differences between Ni-Hard and Ni-resist. If you have large-volume custom casting needs, consider collaborating with Mulan Manufacturing Group. Mulan Manufacturing Group has 13 years of experience in custom metal casting, with long-term shipments to Europe, America, Japan, and South Korea. They possess comprehensive certifications and welcome your inquiries.
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