Quartet Thermal Engineering Pvt. Ltd. Offers Heat Treatment Gas Carburising Plants. Quartet Thermal Engineering Pvt. Ltd. Manufactures different types of Heat Treatment Plants and Furnaces. The Heat Treatment Gas Carburising Plants are very efficient in terms of performance and are precision designed to deliver consistent output and longer service life period. These Heat Treatment Gas Carburising Plants control the gas carburizing process in a very efficient manner and are widely demanded in industry as these have longer life as well as demand low maintenance.