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How to distinguish between seamless steel pipe and hot expansion pipe: the appearance of the steel pipe, the thermal expansion is red, inside the inside is the lead powder. Hot-rolled steel pipe is a way of processing, is the small diameter steel pipe into large diameter steel pipe. Hot-rolled steel pipe than the hot-rolled steel pipe slightly worse mechanical properties.
We often say that the thermal expansion of steel pipe refers to the relatively low density but strong contraction of the steel pipe, (seamless steel pipe) can be referred to as thermal expansion pipe. A method of expanding the diameter of pipe by means of skew rolling or drawing method. In a relatively short period of time so that steel pipe thickening, can produce non-standard, special type of seamless tube, and low cost, high production efficiency, is the current international rolling pipe field development trend.

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