A182F91 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%. SA182F91 steel exhibits excellent performance under high temperature and high pressure conditions, so it is widely used in the manufacture of petrochemical equipment.
How to prepare A182F91 forging valve body?
1. Raw material preparation Select SA182F91 steel ingots that meet the requirements as raw materials, and conduct material chemical composition testing and physical property testing to ensure the quality of raw materials.
2. Heating treatment Heat the raw material SA182F91 steel ingot to improve its plasticity and forgeability. Use appropriate heating temperature and time, control the cooling rate during heating, so that the steel reaches a state suitable for forging.
3. Forging After heating to a suitable temperature, the SA182F91 steel ingot is sent to the forging press for forging. Through the forging process, the internal structure of the steel is improved, and the required external dimensions and mechanical properties are obtained.
4. Heat treatment Heat treatment is performed on the forgings to eliminate the stress and structural defects generated during the forging process, and further improve the mechanical properties of the steel. Use appropriate heat treatment processes, control the heat treatment temperature and time, so that the steel can obtain ideal microstructure and mechanical properties.
5. Processing and testing The forgings after heat treatment are turned, drilled and other processing processes, and dimensional inspection and mechanical property testing are performed to ensure that the products meet the design requirements and standards.
F91 not only has high oxidation resistance and high temperature steam corrosion resistance, but also has good impact toughness and high and stable long-lasting plasticity and thermal strength. When the use temperature is lower than 620℃, its use stress is higher than that of austenitic stainless steel. Above 550℃, the recommended design stress is about twice that of F92 and 2.25Cr-1Mo steel.
Other applications of F91: It can be used as steel pipes for high-temperature superheaters and reheaters of subcritical and supercritical boilers with wall temperatures ≤625℃, as well as high-temperature headers and steam pipes with wall temperatures ≤600℃, and can also be used as nuclear power heat exchangers and furnace tubes for petroleum cracking units.