How to avoid purchasing poor quality galvanized pipe products

1. Shoddy galvanized pipe is easy to scratch, the reason is that shoddy galvanized pipe manufacturers simple equipment, easy to produce burrs, scratch the steel surface. Deep scratching reduces the strength of steel.

2. The fake and inferior galvanized pipe has no metallic luster and is light red or similar to pig iron.

3. The transverse bar of fake and inferior galvanized pipe is thin and low, and the phenomenon of filling is often dissatisfied. The reason is that in order to achieve large negative tolerance, the pressure of the first few passes of the finished product is too large, the iron shape is too small, and the pass shape is not satisfied.

4. The cross section of the fake and inferior galvanized pipe is oval, because the manufacturer in order to save materials, the pressure of the first two lines of the finished roll is too large, the strength of the pipe is greatly reduced, and it does not meet the standard of the external size of the steel pipe.

5. The composition of galvanized pipe is uniform, the tonnage of cold shear machine is high, the end face of the cutting head is smooth and neat, and the shoddy galvanized pipe often has the phenomenon of meat falling off the end face due to the poor material, that is, uneven and no metallic luster. And because the products of fake and inferior manufacturers cut the head less, the head and tail will appear big ears.

6. The material of the fake galvanized pipe contains more impurities, the density of the steel is small, and the size is out of tolerance, so in the absence of a vernier caliper, it can be weighed and checked. In general, it is better to adjust the quantity, mainly because of the cumulative error and probability theory.