Metallographic diagram of 20CrMnTi (910°C carburizing)

20CrMnTi is a kind of alloy steel, which is usually used in the forming processes such as hot rolling, cold rolling, forging, etc. It is also known as a medium-carbon steel and can be heat treated. This steel is further quenched and tempered to improve its tensile strength and impact resistance.

It has excellent weldability and can be machined with ease. It is also known to have good resistance to wear and tear, making it ideal for use in industrial applications. Its tensile strength is about 1250MPa. Additionally, this steel also offers good machinability and excellent corrosion resistance.

It also has a good ability to harden in air and resists softening when exposed to temperatures above 500°C. It is also known to show good wear resistance, excellent heat shock resistance, and low thermal stress resistance.

20CrMnTi steel is also known to be used in the making of gears, shafts, crankshafts, and many other components in automobile industry. Furthermore, it is also used in coal, petroleum and chemical industry, paper industry and power plants. Moreover, it can also be used in construction materials and machinery manufacturing.

20CrMnTi steel is commonly used in the industry after a process of carburizing at a temperature of 910°C. This treatment process results in a layer of carbon and alloying elements being added to the surface of the steel. This process increases the hardness of the steel and improves its wear resistance.

In addition, 20CrMnTi steel is also used for making tools and knives. It can be used for making forging dies and has good fatigue performance and impact toughness. The carbon content of this alloy steel is around 0.16 to 0.23%.

At microstructural level, this alloy contains a mixture of ferrite, pearlite and bainite. This mixture helps in increasing the strength and the ductility of the 20CrMmTi steel. The hardness of this steel reaches HRC50 to HRC56 and the surface hardness can reach HRC58 to HRC62 after carburization.

In conclusion, 20CrMnTi steel is a high mechanical strength alloy steel and commonly used in the automotive industry. It is also used for making tools and knives and shows excellent corrosion resistance and wear resistance. After carburizing at 910°C, it can achieve higher hardness which further improves its wear resistance and performance.

Microstructure of 20CrMnTi at 910°C and carbon infiltration temperature is mainly ferrite, though there are some martensite and pearlite structures. Under microscope, the structure of ferrite was found to be dense, uniformly distributed and randomly oriented. The size and distribution of this ferrite were controlled. The carbon content of ferrite was mainly 0.10 below, and the carbon infilitration was slightly inhomogeneous, which had a slightly positive effect on mechanical properties and wear resistance. There were martensite structures in the microstructure, which were distributed in small, isolated patches. Martensite has a higher carbon content and leads to higher strength and wear resistance of the material. The pearlite structure is mainly in the form of block or lamellar. With the increase of temperature and time, the pearlite structure becomes more compact, and its microhardness is increased. In conclusion, the microstructure of 20CrMnTi at 910°C and carbon infiltration temperature mainly consisted of ferrite, martensite and pearlite, thus providing a excellent combination of mechanical properties and wear resistance.