20CrMo steel is used to manufacture engineering structures requiring higher strength and toughness, such as pressure vessels, steam turbines, etc. The steel is high carbon steel with low hardenability and has good toughness after tempering. 20CrMo steel has good machinability and is commonly used as alloy structural steel.
The hardness of 20CrMo steel is higher than that of 20CrNi2 steel and lower than that of 20CrNi steel. The hardness remains constant during the work hardening process.
Sample size: Blank thickness of sample is 0.5~10 mm
Note: 1) The sample size is a round bar with a diameter of 6 mm; 2) The test temperature is 1000~1050℃.
4) The test speed was 25m/min; 5) Using flame or blowtorch quenching, oil cooling; 6) Tempering temperature 650~750℃.
20CrMo steel has good crack resistance sensitivity, but low impact toughness and hardenability, and can be used to manufacture parts with cross section less than 1m under transverse load and require low strength.
20CrMo steel has the characteristics of high hardness, high wear resistance, and its application field is constantly expanding.
The amount of work absorbed by 20CrMo steel in impact test depends on two factors:
(1) The impact energy is related to the carbon content in the steel sample. The carbon absorption capacity of 20CrMo steel decreases with the increase of carbon content.
(2) The toughness and plasticity of steel are positively correlated with that of 20CrMo steel;
The impact energy mainly depends on the content of Cr in steel, but with the increase of Cr content, the plastic deformation and toughness of 20CrMo steel decrease, so it has higher plasticity and toughness.
20CrMo steel is low carbon carbon tool steel, hardness HRC≤56, the steel has high strength and toughness, after quenching good machining performance (can be cold working). 20CrMo steel is mainly used in the manufacture of machinery and equipment, chemical machinery, metallurgy, mining equipment and automobiles and tractors and other equipment and components with high impact load requirements.
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