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The 63-ply stainless steel has an original thickness of 20 mm and is thinned by repeated rolling to a thickness of 2 mm. You might want to look at this rolling process as a modern forging technique. Also, this rolling process removes all the impurities in the steel leaving you with a very hard, very pure stainless steel. After the rolling processes, the V-G No. 5 cutting edge reaches a hardness of 58-60 degrees on the Rockwell scale and a final thickness of .65 mm. The outside layers each reach a thickness of .675 mm.
There are several different VG stainless steels. Kataoka selected V-G No. 5 stainless steel for the SAN KYOTO knives, because V-G No. 5 can be hardened as hard as any of the other V-G steels but has superior edge retention. Using scientific testing equipment (CATRA), Kataoka was able to show that their knives stayed sharper longer than knives made from other VG steels.
The edge on the SAN KYOTO knives is a minute, beveled edge. The angle of the edge is between 14 and 15 degrees. To appreciate the quality of the edge, you must first look at its incredible mirror polish and then try cutting with it. Kataoka has achieved the perfect balance between sharpness and strength with the SAN edge.
The SAN KYOTO knives are balanced with a stainless steel weight which attaches to the tang and is visible at the heel of the handle. Not only does this add to the beauty of the SAN KYOTO design, it also creates fantastic balance.
Manufactured by Kataoka and Company in Niigata, Japan.
The 3-ply stainless steel starts out with a thickness of 20mm and with a modern repeated rolling-forging technique, it is thinned to a thickness of 2mm. This rolling technique also removes all of the impurities in the steel resulting in a very hard, pure stainless steel. After the rolling process is completed, the VG No.5 cutting edge obtains a hardness of 61 minute degrees on the Rockwell scale with a final thickness of 0.65mm, while the outer layers each obtain a thickness of 0.675mm.
The edge on the SAN knives is a beveled edge with the angle being between 14 and 15 degrees. When you look at the awesome mirror polish and try cutting with it, then you will appreciate the quality of the edge. Kataoka has once again achieved the optimal balance between strength and sharpness with the SAN and SAN TSUBAME Knives edges.
The blade of the SAN TSUBAME is hand-hammered half way down from the spine. The whole blade is then sandblasted but this technique only affects the soft SUS410 stainless steel outer layers thus leaving this layer with a matte finish and the core VG No. 5 with a mirror finish. The sandblasting and hammering process gives the SAN TSUBAME a highly rich appearance.