球墨铸铁管的技术特性国步伟于永强（新兴铸管集团有限责任公司）随着城市现代化的发展，煤气管的需求量越来越多。管材质量关系到城市设施及人们生命财产的安全。现在常用的煤气铸铁管道有灰口铸铁管和球墨铸铁管。灰口管的历史较长，现普遍通过连续铸造法生产。鉴于灰口... Ductile iron pipe technical characteristics Guobu Yu Yong (Xinxing Ductile Iron Pipes Group Co., Ltd.) With the development of urban modernization, the demand for gas pipe more and more. Pipe quality related to urban facilities and people’s lives and property safety. Now commonly used gas cast iron pipe gray cast iron pipe and ductile iron pipe. Gray mouth tube has a long history, is now generally produced by continuous casting method. Given the gray mouth ...