1. Pseudo -inferior steel pipes are prone to folding.
Folding is a variety of folding lines formed on the surface of the steel pipe, which often runs through the vertical direction of the entire product.The reason for folding is that the pursuit of the pursuit of high efficiency is due to the large amount of pursuing the amount, and the amount of the pressure is large, which produces fulphic. The folding product will be folded when the next rolling.
2.The appearance of pseudo -inferior steel pipes often has anesthesia.
The hemp surface is a deficiency that is irregularly caused by the rolling trough's wear seriously caused by the irregular surface of the steel.Due to the pursuit of profits, the pseudo -steel pipe manufacturers often have the most rolling rolling rolling.
3.The surface of the pseudo -inferior steel pipe is prone to scars.
There are two reasons: (1).The material of the pseudo -inferior steel pipe is uneven and impurities.(2).Pseudo -infested materials manufacturers' guard equipment is simple and easy to stick to steel. These impurities can easily produce scars after bite people.
4.The surface of the pseudo -inferiority is prone to cracks. The reason is that its billet is adobe, there are many adobe pores, and the adobe has cracks due to thermal stress during the cooling process. After rolling, cracks are rolled.
5.The pseudo -inferior steel pipe is easy to scratch because the equipment of the inferior steel pipe manufacturers is simple, it is easy to produce burrs, and the surface of the steel is scratched.Deep scraping reduces the strength of steel.
6.The pseudo -inferior steel pipe has no metallic luster and is light red or similar -like iron. The reason is two points. Its ingredients are adobe.2. The temperature of the rolling temperature is not standard. Their steel temperature is observed through visual inspection. This cannot rolled according to the prescribed Austeenopragons area, and the performance of the steel cannot meet the standards.
7.The horizontal tendons of pseudo -inferior steel pipes are thin and low, and they often have dissatisfaction. The reason is that in order to achieve a large negative difference, the first few parts of the finished product are large, the iron type is small, and the hole type is dissatisfied.
8.The cross -section of the pseudo -inferior steel pipe is oval. The reason is that in order to save materials, the manufacturer's pressure on the first two roads of the finished product roller is large. The intensity of this thread decreases greatly, and it does not meet the standards of the shape of the thread.
9.The ingredients of high -quality steel are uniform, the tonnage of the cold shear machine is high, and the cutting of the head is smooth and neat. Due to the poor material, the pseudo -shoddy material often has the phenomenon of dropping meat, that is, unevenness, and no metallic luster.And because the products of fake and shoddy manufacturers are cut, there will be large ear containing heads and tails.
10.The pseudo -inferior steel pipes contain a lot of impurities, the density of the steel is small, and the size is too poor. Therefore, without a cricket caliper, it can be applied to it.For example, for thread 20, the maximum negative difference between the national standard is 5%, and its single theoretical weight is 120 kg when the ruler is 9m. Its minimum weight should be: 120 x (L -5%) = 114 kgThe actual weight of the single root is less than 114 kg, which is a pseudo -inferior steel, because it has a negative difference of more than 5%.Generally speaking, the combined proportion effect will be better, mainly considering the problem of cumulative errors and probability theory.
11.The inner diameter size of the pseudo -inferior steel pipe fluctuates a lot, because of the unstable yin and yang surface of L and steel temperature.2. The composition of the steel is uneven.3. Due to the simple equipment and low foundation strength, the bouncing of the rolling machine is large.There will be a large change in the same week, and such steel bars will not be easily broken.
12.The trademarks and prints of high -quality tubes are relatively standardized.
13.The large threads with a diameter of three steel pipes have a distance between the two trademarks above the IM.
14.The longitudinal tendons of pseudo -inferior steel threads are often wavy.
15.Because the pseudo -steel pipe manufacturers do not have driving, the packaging is relatively loose.The side is oval.
