If the environment temperature is below freezing, should advance to pump into the hot steam, preheating treatment, and then to start the pump.
若环境温度低于冰点，应预先向泵内通入热蒸汽，进行预热处理，然后才可启动齿轮泵。
The effect of preheating treatment process of cold rolls on induction heat quenched structures and the effect of heating temperature and time on structure and hardness have been studied.
研究了轧辊的预备热处理工艺对感应加热淬火组织的影响，感应加热温度和时间对组织和硬度的影响。
A furnace with preheating equipment for water vapor is developed for surface oxidation treatment of hot work dies. This type furnace is successfully used in industry.
针对热作模具钢的表面氧化处理，本文开发了一种带蒸汽预热装置的氧化处理炉，这种炉型现已应用于工业生产。
应用推荐