The hardness of a saw blade varies depending on its material and intended use. Generally, the tooth hardness of ordinary carbon steel saw blades is around HRC 45-55, suitable for cutting wood or soft metals. High-carbon steel or alloy steel saw blades, after quenching and tempering, can achieve a tooth hardness of HRC 55-60, maintaining sharpness while being less prone to breakage.
For high-speed steel (HSS) or carbide tooth saw blades, the tooth hardness can be further increased, typically to HRC 60-65 or higher, suitable for cutting hard metals such as steel plates and stainless steel. These saw blades usually maintain a lower hardness on the back (HRC 30-40) to provide toughness and prevent breakage during cutting.
The saw blade employs a "hard teeth, tough back" structural design, meaning uneven hardness distribution that meets actual cutting requirements: high tooth tip hardness ensures wear resistance, while overall blade toughness ensures resistance to breakage. The hardness of saw blades of different materials and for different applications can be adjusted through heat treatment or surface strengthening processes.
