“Sekikotetsu” is a popular all-purpose knife in Japan.
The cutting edge uses “V Gold No. 10” containing cobalt, molybdenum and vanadium.
The reason for the long-lasting sharpness is that cobalt (CO) is added, so the blade is hard and the cutting edge is less likely to wear even if used for a long time, so the long-lasting sharpness.
blade:stainless steel (Gold V No.10)
MADE IN JAPAN
Add hardness and flexibility by heat treatment
Steel is hard and hard to break through the work of heat treatment (quenching and tempering).
Quenching heats the steel to 780 ° C to 820 ° C and rapidly cools it. It becomes hard by doing so.
Tempering is what gives the steel its tenacity.
Hold at 150 ° C to 180 ° C for 1 hour or more.