Alloy Steel F11 / F22 / F91 Angles & Flats

ASTM A182 Alloy Steel F11, F22, and F91 Angles & Flat represent a group of high-performance materials engineered to deliver exceptional strength, elevated-temperature stability, and corrosion resistance. These alloy steels are specifically designed to withstand demanding environments and applications where both mechanical integrity and resistance to aggressive conditions are essential.

The chemical composition of ASTM A182 Alloy Steel F11, F22, and F91 comprises a combination of iron, chromium, and molybdenum, with varying percentages of other elements. Alloy Steel F11 contains around 1-1.5% chromium and 0.44-0.65% molybdenum, while Alloy Steel F22 consists of approximately 2-2.5% chromium and 0.87-1.13% molybdenum. Alloy Steel F91, a superalloy, includes higher amounts of chromium, molybdenum, and nickel, offering superior resistance to high-temperature oxidation and corrosion. These compositions confer upon them excellent mechanical properties, high-temperature strength, and enhanced resistance to oxidation and corrosion.

The standout feature of ASTM A182 Alloy Steel F11, F22, and F91 Angles & Flat is their remarkable resistance to elevated-temperature degradation, making them particularly suitable for applications in heat-exposed environments. They exhibit superior creep and rupture strength, making them ideal for applications in power generation, including steam turbine components, boiler tubes, and high-temperature piping. Their ability to maintain structural integrity under extreme conditions contributes to their use in the petrochemical, chemical processing, and aerospace sectors.

Heat treatment is a critical aspect of these alloy steels. They are often subjected to heat treatment processes like normalization, tempering, and annealing to achieve desired mechanical properties and thermal stability. This heat treatment optimizes their strength and ductility, ensuring reliable performance even at elevated temperatures.

In terms of corrosion resistance, ASTM A182 Alloy Steel F11, F22, and F91 offer good resistance to oxidation and sulfidation at high temperatures. However, like other alloy steels, their corrosion resistance in certain environments may be limited compared to stainless steels. Proper coating or cladding strategies are recommended for applications where corrosion is a significant concern.