SA182F91 steel is a high chromium ferritic steel with good high temperature strength, oxidation resistance and creep resistance. Its chemical composition is C 0.08 0.12%, Cr 8.0 9.5%, Mo 0.85 1.05%, V 0.18 0.25%, Nb 0.06 0.10%, N 0.03 0.07%. Under high temperature and high pressure working conditions, SA182F91 steel shows excellent performance, so it is widely used in the manufacture of petrochemical equipment.

Preparation method of SA182F91 forging valve body

1. Raw material preparation Select SA182F91 ingot that meets the requirements as raw material, and carry out chemical composition test and physical property test to ensure the quality of raw material.

2. Heating treatment Heat the raw material SA182F91 ingot to improve its plasticity and malleability. Adopt appropriate heating temperature and time, and control the cooling rate during the heating process, so that the steel reaches the state suitable for forging.

3. Forging After being heated to a suitable temperature, the SA182F91 ingot is fed into the forging press for forging. Through the forging process, the internal structure of the steel is improved, and the required dimensions and mechanical properties are obtained.

4. heat treatment Heat treatment of forgings to eliminate the stresses and organisational defects generated during the forging process, and further improve the mechanical properties of steel. The use of appropriate heat treatment process, control the heat treatment temperature and time, so that the steel to obtain the ideal microstructure and mechanical properties.

5. Processing and testing The heat-treated forgings are subjected to turning, drilling and other machining processes, as well as dimensional and mechanical property tests to ensure that the products meet the design requirements and standards.

F91 not only has high oxidation resistance and resistance to high temperature steam corrosion, but also has good impact toughness and high and stable long-lasting plasticity and hot strength properties. At service temperatures below 620°C, its service stress is higher than that of austenitic stainless steel. Above 550℃, the recommended design service stress is about twice that of F92 and 2.25Cr-1Mo steel.

Other applications of F91: It can be used as steel pipe for high temperature superheater and reheater in sub-critical and super-critical boiler with wall temperature ≤ 625℃, as well as high temperature header box and steam pipe with wall temperature ≤ 600℃, and also can be used as heat exchanger of nuclear power and furnace pipe of petroleum cracking device.