To provide a molten salt composition for salt bath nitriding capable of minimizing the variation in the thickness of a nitride layer due to an intra-furnace setting position and forming the uniform nitride layer without forming a compound layer detrimental to durability on an endless metallic belt consisting of a maraging steel liable to form an oxide film and to provide a method for salt bath nitriding of a ferrous metal by using the molten salt composition.
The molten salt composition for salt bath nitriding of the maraging steel contains, as an anion-component, 3 to 20mass% cyan (CN-) and 30 to 50mass% cyanic acid (CNO-), and carbonic acid (CO32-) in the balance of the anion-component, and further contains, as a cation-component, at least sodium or potassium. The method for nitriding the maraging steel includes treatment of the maraging steel with a salt bath of the above molten salt composition at 350 to 470°C.
HATTORI TAKUMI
AZUMA MASATAKE
| JP2000345317A | 2000-12-12 | |||
| JP2000343104A | 2000-12-12 | |||
| JP2002030412A | 2002-01-31 | |||
| JP2000063998A | 2000-02-29 | |||
| JP2002173760A | 2002-06-21 | |||
| JPH06341442A | 1994-12-13 | |||
| JPS5534623A | 1980-03-11 |
Fumiaki Otsuka
Sadao Kumakura
Shishido Kaichi
Toshio Imajo
Nobuo Ogawa
Village shrine Atsuo
Takaki Nishijima
Atsushi Hakoda