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How to choose the appropriate hardness of 45 # steel plate according to actual needs?
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Suitable hardness 45 # steel plate can be selected according to actual needs from the following aspects:
1、 Consider the usage environment
Static load environment:
If the application scenario mainly bears static loads, such as being a supporting part of some structural components, the hardness requirements are relatively lower. You can choose a 45 # steel plate with moderate hardness, such as the hardness range after normalizing treatment (HRC28-HRC35).
Dynamic load environment:
When in a dynamic load environment, such as gears, shafts, and other components in mechanical transmission, higher hardness is required to resist wear and fatigue. Consider using quenched and tempered 45 # steel plate with a hardness between HRC25-HRC32.
Adverse working environment:
In some harsh working conditions such as high temperature, corrosion, and high wear, higher requirements are placed on the hardness and corrosion resistance of steel plates. At this point, surface treatment can be considered for the 45 # steel plate.
2、 Consider processing technology requirements
Cutting processing:
If a large amount of cutting processing is required, such as turning, milling, drilling, etc., the hardness should not be too high.
Welding process:
For situations that require welding, the hardness should not be too high. Excessive hardness can increase the difficulty of welding and easily lead to defects such as welding cracks.
Stamping forming:
If stamping processing is required, the hardness needs to be controlled within a certain range. Generally speaking, 45 # steel plate that has undergone appropriate annealing treatment has a hardness between HRC15-HRC25, which is more suitable for stamping forming.
3、 Consider cost factors
Costs of different hardness treatments:
Different heat treatment methods and surface treatment methods can lead to cost differences. Generally speaking, the cost of normalizing treatment is relatively low, the cost of tempering treatment is moderate, and the cost of surface treatment such as carburizing and nitriding is relatively high.
In summary, selecting the appropriate hardness of 45 # steel plate based on actual needs requires comprehensive consideration of usage environment, processing technology requirements, and cost factors to achieve the best balance between performance and cost.
