How to identify thick-walled seamless steel tubes?

1. The shoddy thick-walled seamless steel pipe is prone to folding. Folding is a variety of fold lines formed on the surface of thick-walled seamless steel tubes, which often extend throughout the longitudinal direction of the product. The reason for the folding is that the inferior manufacturer pursues high efficiency, the amount of pressing is too large, and the ear is produced. When the next rolling is performed, the folding occurs, and the folded product is cracked after bending, and the strength of the thick-walled seamless steel pipe is greatly reduced. .

2. The surface of the counterfeit thick-walled seamless steel pipe often has a pockmark phenomenon. The pockmark is a defect caused by the irregular irregularity of the surface of the thick-walled seamless steel pipe due to the serious wear of the groove. Due to the pursuit of profit by shoddy and thick-walled seamless steel pipe manufacturers, the most frequent rolling mill rolling is exceeded.

3. The surface of the counterfeit thick-walled seamless steel pipe is prone to scarring.
There are two reasons for this:
1 Inferior thick-walled seamless steel pipe material is uneven and has many impurities.
2 fake inferior material manufacturers guide equipment is simple, easy to stick steel, these impurities are easy to produce scars after biting people.

4. The surface of the fake inferior material is prone to cracks because the billet is adobe, the adobe has many pores, and the adobe is cracked by the action of thermal stress during the cooling process, and there is crack after rolling.

5. The rectangular tube tells the story that the shoddy and thick-walled seamless steel pipe is easy to be scratched. The reason is that the equipment of the fake inferior material is simple, easy to produce burrs and scratch the surface of the thick-walled seamless steel pipe. Deep scratches reduce the strength of thick-walled seamless steel tubes.

6. The shoddy thick-walled seamless steel pipe has no metallic luster and is light red or similar to pig iron.
There are two reasons for this:
1 Its blank is an adobe.
2 The temperature of the fake inferior material rolling is not standard. Their steel temperature is measured by visual inspection. Therefore, the rolling can not be carried out according to the specified austenite region, and the performance of the thick-walled seamless steel pipe naturally cannot reach the standard.

7. Seamless square tube tells that the transverse ribs of the shoddy thick-walled seamless steel pipe are thin and low, and often there is a phenomenon of dissatisfaction. The reason is that the manufacturer has to achieve a large negative tolerance, and the reduction of the first few passes of the finished product is too large, and the iron type is biased. Small, the hole type is not full.

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Post time: Jun-18-2019
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