... , 2.for aluminum, copper, zinc,etc. 3.melting, holding Big well type H/T furnace1. heat energy :electricity2. ... as shafts ,rods and gears for H/T of quenching ,temping ,forging,annealing ,carbon penetrating etc3.temperature control : PID4.Use Conditions : 1)the elevation ... meters; 2)Relative humidity not more than 85%; 3)Environmental temperature - 10 °C; + 50 °C 4)There is no dust and ...