On January 10, 2017, the United States Patent and Trademark Office awarded patent number 9,540,721 to George Barbour, President of Heavy Carbon Company for a Method of Carburizing which allows a carburizing process in a furnace at high temperatures in a protective atmosphere.  The primary function of this carburizing method  is soot control with an atmosphere flow providing a constant low CH4 to produce a strong reaction for a high quality atmosphere regardless of carbon potential set point.

This new method carburizes at a carbon potential well into the soot range while maintaining a controllable carbon potential with a stable CH4.  This stability maintains a constant reaction, cracking an air/gas mix in a self heated retort to a temperature of 1825f before entry into the furnace.  The high carbon potential penetrates the steel surface at a rate up to 30% faster saving time and money while producing higher quality parts.

In addition to the speed at a higher carbon potential at high temperatures, the atmosphere will also penetrate lower grade steels at lower temperatures without using ammonia to raise the HRC.  The air/gas mix is cracked in a retort outside the furnace to form the atmosphere and is heated at the same high temperature of 1825f before entry into the furnace.  In this manner, the low furnace temperature does not hinder the reaction that must take place in the furnace.

Soot control takes place simultaneously while the carburizing cycle is in operation therefore no time is lost to clean soot from the furnace, instead of using furnace time to remove soot and clean the furnace, loads can be run instead.  Time is money and soot burn out takes time.  Because less time is required per load less gas and power is used resulting in more cost savings.

The Heavy Carbon Company manufactures the patented system which is known as the Endocarb System.  The Endocarb System can be added to existing furnaces or built into a furnace at the time of manufacture.