ThePipingMart Blog Grades Incoloy 135 Alloy – Composition, Properties, and Uses

Incoloy 135 Alloy – Composition, Properties, and Uses

Incoloy 135

Incoloy 135, also known as Inconel 135, is a nickel-based alloy commonly used in various applications that require a high degree of resistance to corrosion. In this blog post, we will discuss the composition, physical and mechanical properties, hardness, heat treatment, and applications of Incoloy 135.

Incoloy 135 Composition

Incoloy 135 is a nickel-chromium-iron alloy that contains around 72% nickel, 17% chromium, 7% iron, and other trace elements such as molybdenum, titanium, and aluminium. The high nickel content makes Incoloy 135 highly corrosion-resistant in harsh environments, such as marine and chemical processing industries.

Incoloy 135 Physical Properties

Incoloy 135 has a density of 8.2 g/cm³ and a melting point of 1390-1425°C. It has a high coefficient of thermal expansion and good thermal conductivity, making it an excellent choice for high-temperature applications. Incoloy 135 also exhibits good resistance to oxidation, sulfidation, and carburization in high-temperature environments.

Incoloy 135 Mechanical Properties

Incoloy 135 has excellent mechanical properties, including high strength and toughness, good creep resistance, and fatigue strength. It has a yield strength of 310 MPa and tensile strength of 690 MPa at room temperature. The alloy also has good ductility and is easy to form and weld.

Incoloy 135 Uses

Incoloy 135 is commonly used in various applications, such as gas turbine components, chemical processing equipment, and marine equipment. Due to its high strength and corrosion resistance, Incoloy 135 is used in gas turbines in combustion chamber liners, turbine blades, and exhaust systems. It is used in heat exchangers, pumps, and valves in chemical processing equipment due to its excellent resistance to acids, salts, and other corrosive materials.

Incoloy 135 Hardness

Incoloy 135 has a typical hardness of Rockwell C of 27-32, which is relatively high compared to other nickel-based alloys. This makes it resistant to wear and tear and suitable for applications that require abrasion resistance.

Incoloy 135 Heat Treatment

Incoloy 135 is a solid solution-strengthened alloy and does not require heat treatment for its mechanical properties. However, annealing can be performed to improve its ductility and workability. It can be annealed at 980-1035°C for 15-20 minutes per millimetre thickness.


Incoloy 135 is a high-performance nickel-based alloy that offers excellent resistance to corrosion, high-temperature environments, and other harsh conditions. Due to its unique physical and mechanical properties, it is commonly used in various applications, such as gas turbines, chemical processing, and marine equipment. Understanding the composition, properties, hardness, and heat treatment methods of Incoloy 135 will help you determine whether it is suitable for your specific application.

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