Spring steel can hold an edge effectively, but it depends on various factors such as the specific type of spring steel, the heat treatment it has undergone, and the intended use of the blade.

Spring steel is typically hardened to enhance its strength and durability. Hardening the steel can increase its ability to hold an edge and resist deformation. However, it's important to note that the hardness alone is not the sole factor that determines edge retention.

Other factors that can impact the edge retention of spring steel include the steel's composition, the quality of the heat treatment process, the blade's geometry, and the specific cutting tasks the blade is subjected to. The edge retention can also be influenced by the frequency and type of maintenance performed on the blade.

Proper sharpening techniques and maintenance routines, such as regular honing and periodic re-sharpening, can help maintain the sharpness and edge retention of spring steel blades. Additionally, using appropriate cutting techniques and avoiding tasks that could overly stress the edge, such as twisting or prying, can help prolong the blade's edge retention.

It's important to keep in mind that while spring steel can hold an edge effectively, it may not have the same edge retention as certain high-performance tool steels or specialized alloys specifically designed for long-lasting sharpness. The specific edge retention of a spring steel blade can vary depending on the aforementioned factors, and it's important to consider the trade-offs between hardness, toughness, and other desired properties for the intended use of the blade.