... 20 pipes, and the annealing furnace tube is 332) Annealing temperature: 800-900°C3) Annealing speed: 15m/min4) The outside ... 5) Inside structure: inside is firebrick, middle-side is high temperature resistant wool board, outside is transported brick, outermost layer is ... high temperature wool board, the width of furnace chamber is 1130mm , ...