What are the characteristics and applications of 30CrMo steel plate?

This steel has high strength and toughness, high hardenability, the critical quenching diameter in oil 15 ~ 70mm.
The thermal strength of steel is also good. It has sufficient high temperature strength below 500℃, but its strength decreases significantly at 550℃.
When the alloying element welding at the lower limit is quite good, but close to the upper limit of the weldability is medium, and before welding need to preheat to more than 175℃.
Steel has good machinability and medium plasticity during cold deformation. The first type of tempering brittleness is found in the range of 300 ~ 350℃ during heat treatment. Tend to form white spots.

This kind of steel is usually used in the state of tempering and tempering, when the carbon content is the lower limit of the steel can also be used as a higher core strength of the carburizing steel.
In the medium machinery manufacturing industry, it is mainly used to manufacture the quenching and tempering parts with large cross-section and working under high stress conditions, such as shaft, spindle and the high load control wheel, bolts, studs, gears, etc.

In the chemical industry used to manufacture welding parts, plate and pipe welding structure and in the medium containing nitrogen and hydrogen working temperature does not exceed 250℃ of high pressure conduit.
In the steam turbine, boiler manufacturing industry for the manufacture of fasteners below 450℃, 500℃ below the high pressure flanges and nuts, especially suitable for the manufacture of 300 atmospheric pressure, 400℃ below the work of the pipe.