The tap hole of converter is the unique channel from the converter to the ladle , it is crucial for the steel plants to improve the working ratio, increase the output within the unit time ;while the working condition of the tap hole is extreme harsh :                                    

1.It is impacted by steel water under 1500-1700 degrees again and again;       

2.It is oxidized, washed and eroded frequently;                              

3.It is easy destroy because of the quick cooling in treat .

     Under the severe working environment ,the inside diameter of tap hole is expanded more and more, tapping time decrease with the usage frequency’s increasing, tapping time is shorter than stimulate ones ,then slag entrapment will become the inevitable phenomenon, this will effect the output heavily .At this situation we have to change the tap hole .

     The service life of tap hole will effect the Metallurgical cycle,steel productivity , effect of slag of the converter ,and then the quality of the steel directly. The good degrees of tap hole will control the amount of slag of converter immediately ,and effect the absorb for the alloy together with the continue treatment directly .

     In view of above reasons ,the steel plants by converter pay much more attention to the tap hole ,list the technical and manufacture into the most important item, so it is an indisputable reality that it is for the converter that the tap hole is vital important.

Now let us compare two kinds of whole tap hole as following items  together:

So the result is obvious for every one of us :The 99% is much more excellent than 97!