| Abstrakt: |
1.Certain compositions containing urea are recommended for chemicothermal treatment of steels instead of cyanide baths.2.The main advantages of these new salt baths are the nontoxicity of urea before melting, its availability, the lack of precautions needed in transporting and storing it, and also the low cost of the treatment due to the low cost of urea.3.Our investigations of the structure and properties of steels treated in the new baths show that the mixtures recommended can be substituted for the cyanide baths presently used.4.Salt baths with urea as the active component are in commercial use in Rumanian machinebuilding plants producing automotive, mining, transportation, farm, and textile equipment. The technical-economic advantages of the new baths and the absence of toxicity before melting allow the new mixtures to be used in many machinebuilding plants.5.The use of baths containing urea or cyanate obtained from urea has shown the efficiency of this treatment and the rationability of using them in place of sodium and potassium cyanides. |
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