物理性质与球墨铸铁管类似，但在延伸率等较多方面均劣于球墨铸铁管，但灰口铸铁管价格适中。
Its physical property is similar to that of spheroidal graphite iron tubes, but some aspects such as elongation percentage are inferior to the spheroidal graphite iron tubes.
物理性质与球墨铸铁管类似，但在延伸率等较多方面均劣于球墨铸铁管，但灰口铸铁管价格适中。
Its physical property is similar to that of spheroidal graphite iron tubes, but some aspects such as elongation percentage are inferior to the spheroidal graphite iron tubes.
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