Situations where 45# steel can be considered include but are not limited to the following:

Situations, where 45# steel can be considered, include but are not limited to the following:

Parts that require higher strength and hardness: 45# steel has higher strength and hardness, and is suitable for manufacturing parts that need to withstand greater force and pressure, such as shafts, gears, bolts, etc.

Need good wear resistance and corrosion resistance: 45# steel can improve its hardness and wear resistance after a proper heat treatment process and is suitable for the manufacture of parts that need good wear resistance and corrosion resistance.
Relatively low-cost requirements: Compared with some high-alloy steel materials, 45# steel has a low cost and is suitable for some application scenarios with relatively low-cost requirements.

Applicable to general engineering applications: 45# steel has good comprehensive performance and is suitable for general engineering applications, such as machinery manufacturing, automobile manufacturing, construction engineering, etc. It should be noted that whether to use 45# steel or not needs to be comprehensively considered according to specific application scenarios and requirements, including mechanical properties, wear resistance, corrosion resistance, cost and other factors. When selecting materials, evaluation and selection should be made according to the actual situation.