Method for the preparation of a hardening salt in piece form and

Details Method for the preparation of a hardening salt in piece form and Method for the preparation of a hardening salt in piece form and

1994-07-13

1995-09-26

Andrews, Melvyn

Specialized metallurgical processes, compositions for use therei

Compositions

75770, 148 27, C21D 1607

Patent

active

054531098

ABSTRACT:
A method for the preparation of a salt mixture useful for hardening steel parts, including of potassium cyanate, potassium carbonate and sodium carbonate, wherein 2.2 to 2.3 moles of urea is first reacted with 1 mole of potassium carbonate to form potassium cyanate. The escaping ammonia is converted with formaldehyde into hexamethylenetetramine. The reaction product, which is potassium cyanate and potassium carbonate, is ground, mixed with powdered sodium carbonate and pressed at between 80.degree. and 230.degree. C. into shaped pieces.

REFERENCES:
patent: 2002180 (1935-05-01), Holden
patent: 2801154 (1957-07-01), Pree et al.
patent: 4019928 (1977-04-01), Beyer et al.
Firma Degussa Durferrit Apr. 1975 pp. 1-3.
Fachberichte, Sep. 9, 1985 vol. 23, No. 9 pp. 727-733.

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