Patent ID: 9365919
Filing Date: 2016-06-14
CPC Classification: C21D,C23C,F27B,F27D

Claim Text:
1. A method for reduction of time in gas-carburizing, process utilizing step heating comprising the steps of: placing a part into an atmospheric carburizing furnace; said carburizing furnace comprising; heating said part to a first selected temperature; holding said first temperature for a first selected time interval while adding a hydro-carbon gas along with methanol into said furnace; heating said part to a second selected temperature; holding said second temperature for a second selected time interval while adding a hydro-carbon gas into said furnace; heating said part to a third selected temperature; holding said third temperature for a third selected time interval while adding a hydro-carbon gas into said furnace; heating said part to a final selected temperature; holding said final temperature for a final selected time interval while adding a hydro-carbon gas into said furnace; and wherein said first selected temperature is 800° C., said second selected temperature is 850° C., said third selected temperature is 900° C. and said selected final temperature is 930° C.