... tempering,hardening We are a professional supplier of industry furnace,especailsly experienced in design,produce,install.1. low energy ... Burning along the tangent direction of the end of furnace, furnace gas circulation strong and evenly distributed. 4, melting ... easy to operate, no dead slag.7, furnace length, ≥ 4 years of hearth furnace, shaft furnace ≥ 2 yearsWelcome your inquiry. gas fired heat ...