A senior cutlery craftsman, who wished to remain anonymous, has accidentally discovered a new method to enhance the toughness of high-speed steel (HSS) cutting knives during traditional forging.

While fine-tuning the quenching temperature and the ratio of cooling media, the craftsman serendipitously created a unique microcrystalline structure that improves the knife’s impact resistance by 30%—without compromising its sharpness.

The core of this technique lies in precisely controlling the temperature gradient during heat treatment, which induces a composite microstructure of tempered martensite and retained austenite within the steel.

According to the craftsman, this breakthrough was purely accidental—a result of decades of hands-on experience rather than systematic research.

“I was just trying to solve the brittleness issue we often face when forging in winter,” the artisan revealed in an interview. “By adjusting the number of tempering cycles and the soaking time for each cycle, I unexpectedly achieved this exceptionally balanced material property.”

Although the technique is still being refined, it has already drawn attention within the artisanal cutlery community.

Experts believe this practice-driven innovation could offer fresh perspectives for traditional knife-making, particularly as a compelling case study in optimizing material performance through empirical craftsmanship.