PURPOSE:To obtain a salt bath soft nitriding agent for iron and steel material capable of using at temperatures lower than heretofore, by providing a composition which is composed principally of KOCN containing specific amounts of K2CO3 and to which a compounding material consisting of KCl, LiCl, and BaCl2 is added as an auxiliary component. CONSTITUTION:As the salt bath soft nitriding agent for use in the surface hardening treatment of iron and steel parts, a composition which has KOCN containing =20wt% K2CO3 as a main active component and to which compounding material of =450 deg.C melting point consisting of KCl, LiCl, and BaCl=2 and having a composition indicated by a shaded part in the KCl-LiCl- BaCl2 ternary diagram is added as an auxiliary component is provided. In this way, the low-temp. salt bath soft nitriding agent for surface hardening treatment of iron and steel parts can be obtained at a temp. lower than the conventional treating temp. by about 100 deg.C.
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