对预应力管道，预应力通过套管与裂纹管道过盈配合方式产生。
To prestressed sleeve, prestressed produced through interference fit between sleeve and crack pipeline.
因此要求这种套管必须具有相当的抵抗射孔裂纹迅速扩展的能力，即所谓的射孔性能。
Therefore, good resistance to the rapid propagation of perforation cracks, or the so-called perforation performance must be required for the casing pipes.
采用金相等方法，对J55钢套管坯上的裂纹进行了分析。
The analysis has been taken on the cracks occurring in semi-products of J55 sleeve pipes.
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