冶炼时间 meaning in Chinese

duration of heating
heat time
tap to tap time

This paper comes from a project which is to design and produce a new automatic control system to replace an i . a . f system runned by guangzhou iron factory . the older i . a . f system was produced by u . s . a . its maintain cost is too high and its running effect is not satisfied enough . the new systerm is an artificial one . tested by many experiments , it is justified that it can improve many important characteristics and strengthen manegement
广钢40t电弧炉上原有一套美国的iaf控制系统，但由于运行时间较长并且维护费用较高，电弧炉运行的经济指标较差，三相电流不稳定，不平衡，强吹ar时电流冲击大，冶炼时间长，电耗高，生产管理，工艺管理有待进一步加强，为向标准化方向发展，特为广钢40t电弧炉重新设计智能控制系统。