It has reference role to the researches, manufacture and the usage of straight welded casing in our nation.
对我国有关单位今后研究、生产、使用直缝焊接套管有参考作用。
It is introduced in brief that the domestic and foreign employed situation of straight welded casing, manufacture technology and production condition, and some researches being done at present.
简要介绍了直缝焊套管国内外使用情况，生产技术以及国内外生产现状，目前正在进行的一些试验研究工作。
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