Steel pipes with inner cement lining slightly cracked or scratched on the edge.
钢管边沿水泥内衬，轻微裂痕、擦痕。
The bond between inner plastic lining and steel tube base metal of that steel plastic clad tube is good, and the service life is long.
所生产的钢塑复合管道其内衬层与钢管基体贴合好、使用寿命长。
The inner sleeve is hot-dip galvanized steel, the outer sleeve and lining sleeves are aluminium.
内接续管为热镀钢制件，外续管口及两端衬管为铝制件。
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