The difference in quality and durability between normal quenched and tempered stainless steel kitchen knives and those that have been cryogenically treated lies in the overall performance and edge retention of the knives. Cryogenic treatment is an additional step in the knife-making process that involves subjecting the blade to extremely low temperatures, typically around -300°F (-185°C), for an extended period. Here's how the two processes compare:
Hardness and Wear Resistance:
- Normal Quenching & Tempering: Standard quenching and tempering processes already enhance the hardness of the stainless steel, providing good wear resistance. However, the blade may still experience wear and micro-fractures over time with regular use.
- Cryogenic Treatment: Cryogenic treatment further refines the steel's microstructure, reducing retained austenite and increasing the hardness and wear resistance. This can result in a blade that maintains its sharpness and edge retention for a longer period compared to knives without cryogenic treatment.
Edge Retention:
- Normal Quenching & Tempering: While the standard process results in a reasonably sharp edge, the blade's sharpness may gradually decrease with use and require more frequent honing or sharpening.
- Cryogenic Treatment: Cryogenic treatment can significantly improve edge retention, meaning the blade will stay sharp for a longer time, reducing the need for frequent sharpening.
Resilience and Toughness:
- Normal Quenching & Tempering: The standard process provides good toughness to the blade, making it less likely to chip or break during regular use.
- Cryogenic Treatment: Cryogenically treated blades can have enhanced toughness, making them even more resistant to chipping or fracturing, especially under more demanding cutting tasks.
Cost:
- Normal Quenching & Tempering: The standard quenching and tempering process is a common industrial practice and generally more affordable.
- Cryogenic Treatment: Cryogenic treatment is an additional step that requires specialized equipment and expertise, making it a more expensive process, which can reflect in the price of the knives.
In summary, cryogenically treated stainless steel kitchen knives tend to offer better edge retention, wear resistance, and overall durability compared to knives that only undergo normal quenching and tempering. However, it's important to note that the overall quality of a knife depends on various factors, including the type of steel used, the heat treatment process, and the craftsmanship. Always consider the reputation of the manufacturer and read reviews or consult with experts before making a purchasing decision.