Ginsan San Mai Stainless Clad Knife Steel Billet

Premium Japanese stainless knife steel combining fine edge performance with excellent corrosion resistance.

Ginsan, also known as Ginsanko or Silver #3 steel, is one of Japan’s most respected stainless knife steels. Developed to deliver the refined sharpening characteristics and cutting feel of traditional Japanese carbon steels while providing stainless corrosion resistance, it has become a favourite among high-end Japanese kitchen knife makers.

Unlike many high-alloy stainless steels, Ginsan maintains a fine grain structure that allows clean edge formation, smooth sharpening response and excellent cutting feel. The result is a stainless steel capable of impressive sharpness without the brittle or overly wear-resistant character often associated with some modern powder metallurgy steels.

This San Mai billet combines a Ginsan stainless core with stainless outer cladding, creating a premium laminated construction suited to refined kitchen knives and performance-focused culinary blades.

Ginsan responds well to precise heat treatment and is capable of achieving excellent hardness and edge stability while remaining more forgiving and corrosion resistant than traditional high-carbon Japanese steels.

Favoured by makers seeking a balance of performance, usability, corrosion resistance and traditional Japanese cutting characteristics.

Suggested heat treatment

The following heat treatment information is intended as a starting point for testing and refinement. Final results will vary depending on equipment, temperature control, quench medium, blade geometry and section thickness.

Preheat / equalise:
Slowly ramp to 650°C to equalise the steel core temperature.

Austenitising:
Heat to 1025–1040°C

Hold time:
Approx. 10 minutes

Quench:
Fast quench oil

Cryo / cold treatment:
Optional, but recommended

Temper:
175–200°C for 2 hours x 2

Expected final hardness:
Approx. 59–62 HRC

About Ginsan / Silver #3

Ginsan is considered a clean, easy-to-sharpen Japanese stainless steel. It may not match the peak edge retention of White #1 or Blue #1 carbon steels, but it offers the major advantage of corrosion resistance, making it a highly regarded steel choice for chefs and makers wanting a more practical, lower-maintenance kitchen knife steel.

Expert note

Ginsan is a good choice for makers wanting Japanese-style cutting performance with easier maintenance than carbon steel. As with all knife steels, heat treatment, blade geometry and finishing will have a major impact on the final performance.