1. Composition of aluminum profile: Different aluminum alloys have different compositions and corresponding hardness. If the composition of aluminum profile is hard, its strength and hardness are high, and it is not easy to be deformed or damaged.

2. Processing method of aluminum profile: Different processing methods of aluminum profile will have different effects on its hardness. For example, heat treatment can improve the hardness of aluminum profiles, and cold working can reduce the hardness of aluminum profiles.

3. Use occasions: Different use occasions require different hardness of aluminum profiles. If the aluminum profile is only used in general occasions, too long straightening has little effect on its hardness, but if it is used in occasions requiring high hardness, it has great influence on its performance.