... copper, zinc,etc. 3.melting, holding Big well type H/T furnace1. heat energy :electricity2.popuse:mainly used to ... big work pieces,such as shafts ,rods and gears for H/T of quenching ,temping ,forging,annealing ,carbon penetrating ... not more than 85%; 3)Environmental temperature - 10 °C; + 50 °C 4)There is no dust and gas and corrosive ... )No obvious vibration and turbulence; Big well type H/T furnace