الوصف

In ***7 the British H.Morrogh found, in additional CE eutectic gray cast iron, the content in more than 0.*2wt%, spherical graphite. In ***8 the United States A. P.Ganganebin et al pointed out, in cast iron magnesium ferrosilicon inoculant, then, when the residualmagnesium content is greater than 0.*4wt%, get spheroidal graphite. Since then, ductile iron began large-scale industrial production. The ductile iron pipe usage history can be traced back to the ***8 Paris suburb from Seine River to Versailles about *1.*4Km pipeline, **0 years time, except for the part of pipes and fittings repair replacement, the subject is still in use today. Status and Prospect of China's ductile cast iron ductile iron pipe industry in China started in the early nineteen ninties, support energetically inChina urban water supply association under the rapid development,after nearly *0 years of practice, its safety, practicality has been generally recognized in ***8 of domestic water supply industry, the annual output has reached ******0 tons, is *1 times that of ***0.Because China is a country that lack water resources, water shortage city for more than **0, severe water shortage in the cityfor more than **0, water supply enterprise be just unfolding, ductile iron pipe and has broad prospects for development.