20CrNi2Mo (pit cooling after carbonitriding, then quenching, low temperature tempering) metallographic diagram

20CrNi2Mo ferritic fallowan is a popular product used in many manufacturing processes around the world. This steel alloy is notable for its balance of wear-resistance and ductility, as well as its resistance to corrosion and heat. 20CrNi2Mo ferritic fallowan is commonly used in components requiring a combination of strength, toughness, and ductility.

To ensure the best performance for 20CrNi2Mo ferritic fallowan, it is usually processed through a cold treatment process. This involves quenching the steel in a bath of oil, water or air to improve its strength and harden the material. Then, it is tempered in order to reduce hardness, increase ductility and prevent cracking. Finally, it may be put through a low-temperature tempering process to further enhance its properties.

20CrNi2Mo ferritic fallowan is composed of 20% chromium, 2% Niobium, 2% Molybdenum, and 72% Iron. This combination of elements gives the 20CrNi2Mo ferritic fallowan a very good strength-to-weight ratio, as well as a significant resistance to environmental and chemical damage. The chromium and niobium in 20CrNi2Mo ferritic fallowan includes chromium-niobium carbide inclusions, giving it excellent wear-resistance characteristics. Additionally, 20CrNi2Mo ferritic fallowan is remarkable for its ability to resist hydrogen embrittlement, making it suitable for use in carburizing and nitriding operations.

The microstructure of 20CrNi2Mo ferritic fallowan is composed of ferrite, which is a form of iron, and pearlite, which is a formation of iron and iron oxide. The ferrite consists of elongated ferrite grains, which are combined with intermetallic precipitate particles. This microstructure gives the 20CrNi2Mo ferritic fallowan increased hardness and wear-resistance. The intermetallic precipitate particles increase the corrosion resistance of the 20CrNi2Mo ferritic fallowan.

The heat treatment of the 20CrNi2Mo ferritic fallowan is highly important and is typically performed using temperature ranges between 815 to 870 °C (1,500 to 1,590 °F). At these temperatures, the 20CrNi2Mo ferritic fallowan is austenitized and subsequently quenched in oil. This process helps to improve the strength of the steel, as well as its ductility. When the 20CrNi2Mo ferritic fallowan is heated to temperatures between 500 to 760 °C (930 to 1,400 °F), it is put through a low-temperature tempering process to further enhance its properties. This process helps to reduce its hardness and improve its toughness, ductility, and ductility.

In conclusion, 20CrNi2Mo ferritic fallowan is a popular product that is used in many manufacturing processes around the world. It is notable for its balance of wear-resistance and ductility, as well as its resistance to corrosion and heat. 20CrNi2Mo ferritic fallowan is usually processed through a cold treatment process involving quenching, tempering and low-temperature tempering. Its composed of chromium, iron, molybdenum and niobium, giving it excellent properties such as corrosion resistance and an excellent strength-to-weight ratio. The microstructure of 20CrNi2Mo ferritic fallowan is composed of ferrite, pearlite, and intermetallic precipitate particles, contributing to its wear-resistance characteristics. The heat treatment of 20CrNi2Mo ferritic fallowan is typically performed using temperatures between 815 to 870 °C and 500 to 760 °C to austenitize and temper the steel, respectively. This helps to further improve the strength and ductility of the 20CrNi2Mo ferritic fallowan.

20CrNi2Mo is a kind of carburizing and nitrogen joint penetration (CNJP) heat treatment process commonly used in the production of alloy steel products. CNJP is a process in which carbon and nitrogen are added to steel to increase its wear resistance, toughness and strength. After CNJP heat treatment, 20CrNi2Mo undergoes a quenching process to further increase the hardness of the steel. Following this, it is subjected to a tempering and low temperature tempering process to improve its ductility, toughness and strength.

Under the optical microscope, the 20CrNi2Mo samples before and after quenching treatment shows a microstructure composed of tiny globular ferrite grains, small cubes and needles of acicular ferrite, which form a totally continuous network, making it highly refine and uniform. After tempering between 150-200 °C, the microstructure is composed of ferrite, pearlite and bainite, which demonstrates its excellent ductility and toughness.

The surface of the samples before and after quenching and tempering treatment appears that oxide film and carbide particles of small size, which present as irregular and dispersed distribution. In addition, there are significant amounts of free carbon on the surface, as well as some nitride structures. After low-temperature tempering, the oxide film on the surface increases in thickness, the surface is smooth and the nitride structures become more even and distinct.

To sum up, 20CrNi2Mo heat treatment is a complex process. CNJP heat treatment makes the steel more wear-resistant and toughened. Quenching process increases the hardness of the steel while tempering and low-temperature tempering further improve its ductility, toughness and strength. The finished product displays an even and distinct structure of oxide film and carbide particles with improved surface.