What Are The Pitfalls Of Using Counterfeit Thick-walled Seamless Steel Pipes?

What are the drawbacks of using fake and thick-walled seamless steel pipe? Counterfeit steel pipes or erw steel pipe not only cause economic losses to the company, but also cause unqualified project quality and pose danger to personal safety.

1. Easy to fold. Folding is the formation of a variety of fold lines on the surface of thick-walled seamless steel tubes. Such defects often run through the entire product. The reason for the folding is due to the high efficiency of the shoddy manufacturers, the large amount of reduction, the generation of ears, and the folding of the folded products. The folded products will crack after bending, and the strength of the thick-walled seamless steel pipe will decrease greatly..
2. The surface of the tube often has pockmarks. Mamian is a defect caused by the irregular wear and tear of the thick-walled seamless steel pipe due to the wear of the groove. Due to fake and thick thick-walled seamless steel pipe manufacturers to seek profits, rolling slot rolling is often the most excessive.
3. The surface is susceptible to scarring. There are two reasons for this: 1. Pseudo-inferior thick-walled seamless steel pipes are not uniform in material and have many impurities. 2. The inferior guide manufacturers' equipment is simple and easy to stick to steel, and these impurities are easy to produce scars after being bitten by rollers.
4. The surface of the inferior material is prone to cracks because its blank is adobe and the porosity of the blank is large. The adobe is subjected to thermal stress during the cooling process and cracks are generated. After the rolling, cracks occur.
5. It is easy to scratch. The reason is that the inferior and inferior materials manufacturers have poor equipment and are prone to produce burrs and scratch the surface of thick-walled seamless steel pipes. Deep scratches reduce the strength of thick-walled seamless steel tubes.
6. No metallic luster, pale red or similar to the color of pig iron, for two reasons, its blank is adobe. 2. The temperature of the shoddy material rolling is not standard. Their steel temperature is measured visually, so that the rolling cannot be carried out according to the prescribed austenitic region. The performance of thick-walled seamless steel tubes naturally cannot be achieved.
7. The transverse ribs are thin and low, and the phenomenon of insufficient filling often occurs. The reason is that manufacturers have to achieve large negative tolerances, and the amount of reduction in the first few passes of the finished product is too large, the iron type is small, and the hole type is insufficiently filled.
8. The cross-section is elliptical, because the manufacturer has to reduce the amount of rolling before the finished roller to save material. The strength of this rebar is greatly reduced, and it does not meet the standard for rebar outer dimensions.
9. High-quality thick-walled seamless steel pipe has uniform composition, cold tongs have high tonnage, and the end face of the cutting head is smooth and neat, and the inferiority of the material due to poor quality is often caused by falling meat on the end surface of the cutting head, ie uneven and non-metallic luster.. Moreover, due to the lack of cut-to-size products from manufacturers of inferior and inferior products, big ears will appear at the head and tail.
10. The inferior steel pipe material contains many impurities, the density of the steel is small, and the size of the steel pipe is so bad that it can be weighed and checked without a caliper. For example, for rebar 20, the national standard specifies a maximum negative tolerance of 5%. When the length is 9M, its single theoretical weight is 120 kg. Its minimum weight should be: 120 X (l-5%) = 114 kg. The actual weighing of a single root weighing less than 114 kilograms is a pseudo-inferior thick-walled seamless steel pipe because its negative tolerance exceeds 5%. In general, the phasing effect will be better, mainly considering cumulative error and probability theory.
11. The inner diameter of the inner diameter fluctuates greatly due to the fact that: l. The temperature of the steel is not stable. 2, the composition of steel is not uniform. 3, due to poor equipment, low foundation strength, rolling mill bounce. There will be a large change in the inner diameter within the same week, so that the steel reinforcement is not easy to produce fracture.
12. The trademarks and printing of high quality materials are more standard.
13. Three large-walled seamless steel tubes with a diameter of 16 or more, the spacing between the two trademarks are all above IM.
14. The longitudinal bars of the rebar are often wavy.
15. Pseudo-inferior thick-walled seamless steel pipe manufacturers have looser packing because they do not drive. The side is oval.

A worker from a steel pipe company, which is located in China.