Ductile iron is in the 50 s of the 20th century developed a kind of high strength cast iron material, its comprehensive performance is close to steel, it is based on its superior performance, has been successfully used in casting some complex loading, requiring higher strength, toughness and abrasion resistance parts.Ductile iron has been rapidly developed to be second only to gray cast iron and widely used in cast iron.The so-called "iron steel" mainly refers to ductile cast iron.
　　domestic
　　In 1981, the Chinese iron experts adopted modern scientific means to study 513 ancient Chinese iron and steel ware unearthed, and by a large amount of data, it was concluded that spherical graphite cast iron appeared in China in the han dynasty.The paper was read at the 18th world conference on science and technology, and it was a great sensation in the world of foundry and technological history.After verification in 1987, the expert of international metallurgical history argued that it was of great significance for the re-staging of the world's metallurgical history.
　　This paper is compiled by shenyang rudong machinery co. LTD