目前,我国木材干燥还是以蒸汽烘干为主。加热器一般采用水煤气光滑管焊接组合而成,在蒸汽、木酸及其它腐蚀质的长期作用下,腐蚀严重。第一汽车制造厂采用上海钢管厂生产的渗铝钢管制造加热器,安装在木材干燥窑内使用二年之久,尚未进行过小修和中修。这种钢管耐腐蚀性损,升温快,散热系数高,是一种较为理想的制造加热器的材料。钢管渗铝是指经过表面处理(酸洗、清水冲冼、烘干)的钢管放入熔融的铝液中,保温一定时间,然后取出冷却,再经过高温扩散退火,使渗铝后的钢管内外表面附上一层高浓度的铝和铁的化合物或纯铝,起到防腐作用。一、钢管渗铝 At present, China’s wood drying or steam-based drying. The heaters are usually made of water gas and smooth pipe welded together. Under the long-term action of steam, wood acid and other corrosive substances, the corrosion is serious. The first automobile factory uses the aluminized steel pipe manufactured by Shanghai Steel Tube Factory to manufacture heaters. It has been installed in a wood drying kiln for two years and has not been subjected to minor and intermediate repairs. This corrosion-resistant steel loss, fast heating, high coefficient of heat dissipation, is a more ideal material for the manufacture of heaters. Pipe aluminized refers to the surface after the treatment (pickling, washed with water, drying) of the steel into molten aluminum, heat for a certain period of time, and then remove the cooling, and then through the high-temperature diffusion annealing, aluminized steel pipe inside and outside Surface attached with a high concentration of aluminum and iron compounds or pure aluminum, play a preservative effect. First, steel aluminized