FIELD: machine building. SUBSTANCE: details are heated within 10-30 min to 350-400 C in air atmosphere. The process is followed by nitration at 570-590 C, mixture ammonia:exogas at ratio 1:4 being used. Thus processed details are allowed to stand within 1-2 h. Then their cooling in oil is carried out. EFFECT: improves efficiency of the method. 1 tbl
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