ThePipingMart Blog Grades Ductile Iron Grade 120-90-02 – Composition, Properties, and Uses

Ductile Iron Grade 120-90-02 – Composition, Properties, and Uses

Grade 120-90-02

The need for specialized materials is rising as technology and manufacturing processes evolve. One such material is Grade 120-90-02, a high-strength cast iron. Its remarkable hardness, wear resistance, and excellent mechanical properties make it one of the most versatile metals in the manufacturing industry. This article will explore the composition, physical and mechanical properties, and various uses of Grade 120-90-02.

Grade 120-90-02 Composition

Grade 120-90-02 is a Ni-Resist cast iron alloy of iron, nickel, and chromium. It contains 12% nickel and 2% chromium, which gives it excellent resistance to wear corrosion, and thermal shock. The alloy is further strengthened with molybdenum, copper, and a small amount of carbon. The carbon content in the alloy affects its hardness, ranging from 2.5 to 3.5%.

C Mn Si Cr Ni Cu Mg
Min% 3.0 0.15 1.5 0.03 0.05 0.15 0.03
Max% 3.8 1.00 2.8 0.07 0.2 1.00 0.06

Grade 120-90-02 Physical Properties

Grade 120-90-02 has a high density of 6.8 g/cm3, making it heavier than most metals. The material’s thermal conductivity is low, which means it is a good insulator. It has a very low coefficient of thermal expansion, which gives it excellent dimensional stability across different temperatures. The material has a maximum operating temperature of 540°C, which is one of the highest among cast irons.

Grade 120-90-02 Mechanical Properties

One of the standout features of Grade 120-90-02 is its remarkable hardness. It has a Brinell hardness rating of 230-260 HB, which makes it one of the hardest cast irons available. The material has excellent wear resistance and can withstand high stresses and impact loads. It also has good machinability, which means it can be easily shaped and modified to meet the requirements of various applications.

Grade 120-90-02 Uses

Grade 120-90-02 is widely used in various industries, including chemical, mining, oil and gas, and pulp and paper. Its excellent resistance to corrosion and wear makes it suitable for pumps, valves, and other components that come in contact with corrosive substances. It is also used in crushing and grinding equipment manufacturing and is valued for its toughness and durability.

Grade 120-90-02 Hardness

Grade 120-90-02 is tough because of its high carbon content and alloying elements. This increased hardness makes it suitable for applications where wear resistance is critical. The material has a high resistance to abrasive wear, making it ideal for mining and construction equipment use.

Grade 120-90-02 Heat Treatment

Grade 120-90-02 is cast iron and generally not heat-treatable. However, it can undergo nitriding, a process in which the material’s surface is diffused with nitrogen to create a hard, wear-resistant layer. Nitriding significantly increases the surface hardness of the material, making it more suitable for high-wear areas.


In conclusion, Grade 120-90-02 is a high-strength cast iron highly valued in various industries. Its unique composition and excellent properties make it an ideal choice for wear resistance, corrosion, and thermal shock components. We expect more uses for this versatile material as manufacturing processes advance. So, if you need a reliable and durable metal component, consider Grade 120-90-02.

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