Identification of fake spiral steel pipe

Identification of fake spiral steel pipe

1. Inferior spiral pipe prone folding. Folding is formed on the surface of a variety of spiral steel fold, this defect is often throughout the product’s portrait. The reason is due to the poor quality manufacturers folding pursuit of high efficiency, reduction is too large and resulting in the ears, which is generated when the next one rolling off stacked, folded products will crack when bent, the big decline in the strength of steel.

2. Spiral steel exterior is often inferior pock phenomenon. Pock is due to badly worn groove steel surface irregularities caused by uneven defects. Due to the poor quality of spiral pipe manufacturers to pursue profits, rolling groove most often exceeded.

3. Inferior spiral steel surface is easy to produce scarring.

4. Poor surface material is easy to crack because it is blank adobe, adobe many pores, the cooling process adobe due to thermal stress, cracks, cracking after rolling alone.

5. Inferior spiral pipe easily scratched because of poor quality spiral pipe manufacturers poorly equipped, easy to produce burrs, scratches steel surface. Deep scratches reduce the strength of steel.

6. Inferior spiral pipe without metallic luster, pale red color of iron or similar, there are two two reasons, it is adobe blank. Rolling temperature is not standard, they are visually steel temperature, so that the region can not be carried out according to the provisions of austenitic rolling steel performance naturally not reached.

7. Inferior spiral steel cross ribs thin and low, often sufficient dissatisfaction phenomenon, because manufacturers is to achieve large negative tolerance, finished the first few tracks reduction is too large, iron-type small, hole filling dissatisfaction.

8. Inferior spiral steel oval in cross section, in order to save material, pre-finished roll plunge two channels is too large, the strength of this steel is greatly decreased, and does not meet the standard dimensions of rebar.

9. Uniform quality steel components, high tonnage cold shear, cut the head face smooth and neat, but the poor quality timber material is poor, there are often cut off the head end surface of the meat of the phenomenon, namely uneven, and no metallic luster. And because fewer low-quality wood product manufacturers cut head, head and tail will appear big ears.