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一、从几个统计数字看球铁铸管的发展随着人类社会的不断发展,用于运输各种物料的管道材料亦有了很大的改进,以输水为例,人们已从原始竹管、木管、陶管发展为水泥管、钢管、灰铁管,近代普遍采用了球墨铸铁管。球墨铸铁管工业是随着本世纪四十年代末,英国国际镍公司获得了应用镁处理球墨铸铁的专利以后才飞跃发展起来的。目前在世界范围内球墨铸铁已发展为仅次子灰口铸铁的铸造合金材料,在吨位和产值方面都超过了可锻铸铁和铸钢,可锻铸铁和铸钢早已
I. The development of ductile iron cast pipes from several statistics With the continuous development of human society, the pipeline materials used for transporting various materials have also been greatly improved. Take water conveyance as an example, people have been from the original bamboo. Pipes, wood pipes, and ceramic pipes have been developed into cement pipes, steel pipes, and gray iron pipes. In recent times, ductile iron pipes have generally been used. In the ductile iron pipe industry, with the patent application of magnesium-treated ductile iron in the late 1940s, the British International Nickel Corporation leapfrogged to develop. At present, nodular cast iron has been developed as the only casting alloy material for second-generation grey cast iron. It has exceeded both malleable cast iron and cast steel in tonnage and output value, and malleable cast iron and cast steel have long been available.