With the application of polyurethane insulation steel pipe more and more widely, many fake polyurethane insulation steel pipe began to flow to the market, in order to avoid the purchase of fake polyurethane insulation pipe, introduce how to identify the quality of polyurethane insulation steel pipe.

The appearance of fake and inferior polyurethane thermal insulation steel pipe often has the phenomenon of pitted surface. Pit surface is due to the rolling groove wear caused by polyurethane insulation steel pipe surface irregular uneven defects. As a result of fake polyurethane insulation steel pipe manufacturers to pursue profits, often appear rolling groove rolling exceeded.

The surface of fake and inferior polyurethane thermal insulation steel pipe is easy to produce cracks, because its blank is adobe, adobe has many pores, and the adobe has cracks due to thermal stress in the cooling process, and there are cracks after rolling.

The transverse ribs of fake polyurethane thermal insulation steel pipes are thin and low, and the phenomenon of dissatisfaction often occurs. The reason is that in order to achieve a large negative tolerance, the pressure reduction of the first few passes of the finished product is too large, the iron type is too small, and the hole type is not satisfied.

The composition of polyurethane insulation pipe is uniform, the tonnage of cold shearing machine is high, and the end face of cutting head is smooth and neat. However, due to poor material quality, the end face of cutting head often has the phenomenon of meat falling, I .e. uneven and no metallic luster. Moreover, due to the fact that the products of fake and inferior materials manufacturers cut less heads, there will be big ears at the head and tail.