1. Fake and inferior thick-walled seamless steel pipes are easy to fold. The manufacturer of Seamless steel pipe for machining tells you that folding is a variety of fold lines formed on the surface of thick-walled seamless steel pipes. Such defects often run through the longitudinal direction of the product. The manufacturer of Seamless steel pipe for machining tells you that the reason for the folding is that the shoddy manufacturer pursues high efficiency, and the pressing amount is too large, which produces ears. The next rolling will produce folds. The folded products will crack and become thick after bending. The strength of the wall seamless steel pipe is greatly reduced.

2. Fake thick-walled seamless steel pipes often have pitting on the surface. The manufacturer of Seamless steel pipe for machining tells you that the pitted surface is caused by the serious abrasion of the rolling groove, which causes irregular irregularities on the surface of the thick-walled seamless steel pipe. As manufacturers of counterfeit and inferior thick-walled seamless steel pipes are pursuing profits, the groove rolling often exceeds the standard.
3. Fake thick-walled seamless steel pipes are prone to scarring on the surface. There are two reasons: 1. The material of fake and inferior thick-walled seamless steel pipes is uneven and there are many impurities. 2. Fake and inferior material manufacturers have simple guide and guard equipment and are easy to stick to steel. These impurities will easily cause scars after biting the roll.
4. The manufacturer of Seamless steel pipe for machining tells you that the surface of fake and inferior materials is prone to cracks. The reason is that its billet is adobe, and the adobe has many pores. During the cooling process, the adobe is subjected to thermal stress, resulting in cracks. There are cracks.
5. Fake and inferior thick-walled seamless steel pipes are easy to scratch. The reason is that the equipment of fake and inferior material manufacturers is simple and easy to produce burrs and scratch the surface of thick-walled seamless steel pipes. Deep scratches reduce the strength of thick-walled seamless steel pipes.
6.Seamless steel pipe for machining The manufacturer tells you that fake thick-walled seamless steel pipes have no metallic luster, and are pale red or pig-iron-like color. There are two reasons: 1. Its blank is adobe. 2. The rolling temperature of counterfeit and inferior materials is not standard, and their steel temperature is visually inspected, so that it cannot be rolled according to the specified austenite area, and the performance of thick-walled seamless steel pipes will naturally not meet the standard.
7. The manufacturer of Seamless steel pipe for machining tells you that the cross ribs of fake thick-walled seamless steel pipes are thin and low, and there are often dissatisfaction. The reason is that the manufacturer, in order to achieve a large negative tolerance, has a large reduction in the first few passes of the finished product. The iron type is too small and the hole type is not full.
8. The manufacturer of the seamless steel pipe for machining tells you that the cross section of the fake thick-walled seamless steel pipe is oval. The reason is that in order to save material, the reduction of the first two passes of the finished roll is too large. The strength of this kind of rebar is greatly improved. Decrease, and it does not meet the standard of the external dimensions of the rebar.
9.Seamless steel pipe for machining The manufacturer tells you that the composition of high-quality thick-walled seamless steel pipes is uniform, the tonnage of the cold shear is high, and the end face of the cutting head is smooth and tidy. However, due to poor material, the end face of the cutting head often has meat Phenomenon, that is, uneven, and no metallic luster. Moreover, because the products of fake and inferior materials manufacturers have fewer cuts, big ears will appear at the beginning and the end.
10. The manufacturer of the seamless steel pipe for machining tells you that the material of the fake thick-walled seamless steel pipe contains many impurities, the density of the steel is too small, and the size tolerance is serious, so it can be weighed and checked without a vernier caliper. Generally speaking, the effect of phasing weighing will be better, mainly considering the problem of cumulative error and probability theory.