Stellite & Cobalt
Alloy Grades

Stellite 1 is a high-hardness cobalt-based alloy designed for severe abrasion, erosion, and metal-to-metal wear environments. It offers excellent hot hardness and corrosion resistance, making it suitable for cutting tools, valve trim, extrusion tooling, and wear-resistant industrial components operating under extreme conditions.

Chemical Composition

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Execution Standards

Stellite 12 offers higher hardness and abrasion resistance than Stellite 6 while maintaining good corrosion and heat resistance. It is commonly used in severe wear environments involving erosion, sliding wear, and high-temperature service, particularly in valve trim, extrusion tooling, and industrial cutting applications.

Chemical Composition

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Execution Standards

Stellite 20 is designed for applications requiring excellent corrosion resistance combined with moderate wear resistance. Its good thermal stability and resistance to chemical attack make it suitable for sealing components, chemical processing equipment, and high-temperature industrial applications.

Chemical Composition

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Stellite 21 is a cobalt-based alloy known for its outstanding corrosion resistance, thermal stability, and resistance to thermal fatigue. It is widely used in valve stems, steam valves, medical components, and high-temperature sealing applications where toughness and corrosion resistance are more important than maximum hardness.

Chemical Composition

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Execution Standards

Stellite 3 provides higher hardness and abrasion resistance than Stellite 1 while maintaining excellent high-temperature performance. It is commonly used in applications involving severe sliding wear, particle erosion, and high compressive loads, especially in valve components and industrial wear parts.

Chemical Composition

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Stellite 4 is a cobalt-chromium-tungsten alloy with balanced wear resistance and toughness. It performs well under impact and adhesive wear conditions and is widely used for bearing surfaces, sealing areas, and wear-resistant overlays in industrial equipment.

Chemical Composition

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Stellite 6 is the most widely used general-purpose cobalt alloy, offering an excellent combination of wear resistance, corrosion resistance, heat resistance, and galling resistance. It is commonly applied in valve seats, valve balls, bushings, pump components, and hardfacing applications across oil & gas, power generation, and industrial processing industries.

Chemical Composition

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Execution Standards

Stellite 703 is a cobalt-based chromium-molybdenum-carbon alloy developed for applications combining abrasive wear and corrosion. Based on the traditional Stellite 3 alloy, it replaces tungsten with molybdenum to improve corrosion resistance in reducing environments while maintaining strong wear resistance. Hard carbide particles reinforce the cobalt alloy matrix, while molybdenum provides additional solid-solution strengthening. Available as cast components, Stellite 703 is a candidate for valve seats, slides, and other flow-control parts exposed to demanding wear and corrosive process conditions.

Chemical Composition

Stellite 706 is a cobalt-based alloy containing chromium, molybdenum, and carbon, designed for components exposed to combined wear and corrosion. Its nominal composition includes 31% chromium, 4% molybdenum, and 1.2% carbon by mass, with cobalt as the balance and a typical hardness of 39–43 HRC. It offers a balance of wear resistance and ductility within the 700 series, making it a candidate for valve seats, sliding components, and flow-control parts operating in corrosive environments.

Chemical Composition

Stellite 712 is a cobalt-based chromium-molybdenum alloy designed for applications requiring wear and corrosion resistance at elevated temperatures. Its nominal composition includes 31% chromium, 8% molybdenum, and 1.6% carbon by mass, with cobalt as the balance and a typical hardness of 47–51 HRC. Its higher carbon and molybdenum contents distinguish it from Stellite 706, supporting a harder material for demanding wear conditions. Potential applications include valve seats, slides, and refinery flow-control components exposed to simultaneous mechanical wear and chemical attack.

Chemical Composition

Stellite 720 is a cobalt-based alloy containing chromium, molybdenum, and carbon, designed for applications requiring resistance to abrasive wear and corrosion. Stellite 720 has a nominal composition of 33% chromium, 18% molybdenum, and 2.45% carbon by mass, with cobalt as the balance and a typical hardness of 53–60 HRC. Reported applications include material conveying pipes, conveying screws, refinery bends, pump casings, and valve components.

Chemical Composition