Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2015 - zeszyt 4

Badania przydatności materiałów na retorty do niskotemperaturowego nawęglania stali austenitycznych

10.15199/28.2015.4.6

nr katalogowy: 94599
10.15199/28.2015.4.6

In the article the usefulness of H17, 0H18N9, H25N20S2 steel and 75Ni-25Cr alloy in use on furnace retorts designed for low-temperature carburizing of austenitic steels in synthetic or endothermic atmospheres was investigated. As evaluation criterion was considered ability of the material to catalyse gaseous reactions and soot deposition and the possibility of carburizing process conducting for austenitic steel 0H18N9. The studies were conducted in furnace with stationary retort closed with a furnace cover with a sand seal, as well as in portable retort installed in a separate furnace in the case of studies of suitability of retort made of 0H18N9 steel. In the case of a stationary retort made of 0H18N9 steel were studied: a) effect of endogas dilution with nitrogen or hydrogen on soot deposition in retort and Armco foil state after retort heating at temperature 440°C; small amounts of soot in retort and clean Armco foil were obtained in a mixture of 42% endogas with nitrogen or 33% endogas with hydrogen, b) effect of the retort oxidation at temperature 570°C on changes of dew point and soot deposition after heating of oxidized retort to temperature in the range 300÷470; in the case of endogas, dew point increased with increasing temperature and soot appeared in the oxidized zone above 400°C; dilution of endogas with hydrogen shifted the boundary of soot deposition to a higher temperature, c) effect of preliminary oxidation of Armco iron foil on ability for soot deposition on its surface; during heating in endogas at temperature 500°C for 4 hours it was found that soot appeared on the foils oxidized at temperature 450°C and 530°C, while heating in mixture of H2-N2 in endogas led to the appearance of soot only on foil oxidized at temperature 520°C; on the foils oxidized at temperature below 450°C or not-oxidized soot didn't occurred. In addition, attempts of heating and carburizing in portable retort made of 0H18N9 steel were conducted. Whe[...]

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