In the rapid development of steel at the same time, some of the counterfeit steel products on the market also appeared, then how to correctly and accurately identify the quality of steel is good or bad?
1, the appearance of counterfeit steel pipes often appear papules.

The surface of titanium is the uneven surface of irregular steel caused by severe wear and tear. Because of the pursuit of profits of the steel tube manufacturers, rolling rolling is often the most standard.

2, cross section of the fake steel pipe is oval, because manufacturers in order to save materials, the first volume of the product before the pressure is too large, the strength of this steel is greatly reduced, and does not meet the size of the reinforcement.

3, high quality steel composition of uniform, cold shear tonnage is high, cutting end smooth and tidy, pseudo quality poor material, because of poor quality, the cutting surface often meat phenomenon, namely uneven, and no metal luster. And because fake manufacturers cut off small heads, big ears will appear in the head and tail.

4, the diameter of the fake steel pipe fluctuates due to: 1. The temperature of the steel is unstable. 2, the composition of steel is uneven. 3, due to poor equipment, low ground strength, rolling, bouncing big. In the same week, there will be a great change, and the uneven force of the steel will cause cracks.

5. The material of the fake steel pipe contains impurities, the steel density is too small, and the size is extremely serious, so the weight can be called without the vernier caliper. For example, 20 steel, the national standard maximum negative tolerance is 5%, the length of 9m, the single theoretical weight of 120 kg, the minimum weight should be: 120 x (5%) = 114 kg, 114 kg of weighing out a little of the actual weight, it is fake steel. Because it is more than 5% of the negative tolerance. Generally speaking, the whole effect of weighing will be better, mainly taking into account the cumulative error and probability theory.

6, fake steel pipe is easy to scratch, because the steel pipe manufacturer equipment is simple, easy to produce burr, scratches the steel surface. Deep scratches reduce steel strength.

7. The surface of the fake steel pipe is easy to scar.
There are two reasons: (1) uneven distribution of steel pipe, more impurities. (2) the material guide for non poor material manufacturers is simple and easy to adhere to steel. These impurities cause scarring easily after the roller is wound.

8, quality pipe trademark and printing standardization.

9 、 the longitudinal reinforcement of fake steel is usually wavy.
It is forbidden to store objects that affect steel around the spiral steel pipe chimney.