| 摘要 |
FIELD: technological processes.SUBSTANCE: invention relates to chemical-thermal treatment of structural and tool steel and can be used for surface strengthening of parts of machines and tools in machine building, metallurgy, chemical and tool industry. Method of carbonitriding parts comprises preparation of paste by mixing potassium ferricyanide KFe(CN), carbon black DG-100, carbamide, bentonite, marshalite and paste-forming liquid in following proportions, wt%: potassium ferricyanide KFe(CN)- 16, carbamide (NH)CO - 18, bentonite - 12, marshallite - 24, carbon black DG-100 - balance, paste-forming liquid (vol%): polyvinyl acetate emulsion 50 %, ethanol - 10 %, water - 40 %, application of paste on parts, heating in neutral salt bath at following ratio of components, wt%: NaCl - 35, NaCO- 35, NaOH - 30, at a temperature of 550-650 °C with holding at this temperature for 0.5-3 hours. Then part is cooled in oil and low-temperature tempering at temperature 150-200 °C is carried out.EFFECT: higher speed of carbonitriding and reduced labour input, wider temperature range, increased uniformity of heating of parts and high environmental safety.1 cl, 1 ex |
