In recent years, the continuous annealing of cold rolled steel strip has advanced because of the high quality and yield of the process. Yet, there is also an increasing demand for multi-product small-lot manufacturing; and, in accordance, interest in batch annealing has revived because of its few operating restrictions. Here, NKK installed at its Keihin Works Japan's first one-bell two-base 100% ... [Show full abstract] hydrogen annealing system (HAS). Through a number of investigations, NKK has confirmed that the new facility offers such benefits as higher productivity, more uniform heating, improved surface quality, and greater energy savings than conventional batch annealing furnaces. This report introduces the characteristics, equipment, and operation of the new facility.