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How to distinguish the quality of steel pipes

Views: 1     Author: Site Editor     Publish Time: 2020-12-07      Origin: Site

The development of steel pipe production technology began with the rise of the bicycle manufacturing industry, the development of petroleum in the early 19th century, the manufacture of ships, boilers, and aircraft during the two world wars, the manufacture of thermal power boilers after the two world wars, the development of the chemical industry, and the development of petroleum The drilling, production and transportation of natural gas have strongly promoted the development of the steel pipe industry in terms of variety, output and quality.

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While steel pipes are developing rapidly, some fake and inferior steel pipe products have appeared one after another on the market. So how to accurately and accurately identify the quality of steel pipes?


1. Fake and inferior steel pipes often have pitting on the surface.

Pitted surface is the irregularity of the surface of the steel due to the serious wear of the rolling groove. Because the counterfeit and inferior steel pipe manufacturers are pursuing profits, the groove rolling manufacturing often exceeds the standard.


2. The cross section of the counterfeit steel pipe is elliptical. The reason is that in order to save materials, the reduction amount of the first two passes of the finished roll is too large. The strength of this kind of screw steel is greatly reduced, and it does not meet the standard of the shape of the steel .


3. The composition of good steel 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 the poor material, the end face of the cutting head often has meat loss, that is, it is uneven and has no metallic luster. Moreover, because the products of the fake and inferior material manufacturers have few cuts, big ears will appear at the ends.


4. The inner diameter size of fake and inferior steel pipe fluctuates greatly because of:

Unstable steel temperature has a yin and yang side.

The composition of steel is not uniform.

Due to the simple equipment and low foundation strength, the rolling mill bounces greatly. There will be large changes within the same week, and the uneven force of such steel bars is prone to fracture.


5. Fake and inferior steel pipes are easy to scratch, because the equipment of the fake and inferior steel pipe manufacturers is simple and easy to produce burrs and scratch the surface of the steel. Deep scratches reduce the strength of steel.

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6. Fake and inferior steel pipes are prone to scars.

There are two reasons for

(1) Fake and inferior steel pipes have uneven material and many impurities.

(2) The guide and guard equipment of the fake and inferior material manufacturers is simple and easy to stick to the steel. These impurities will easily cause scars after biting the roll.


7. The trademarks and printing of steel pipes are relatively standardized.


8. The longitudinal ribs of counterfeit steel rebar are often wavy.


After understanding the above information, I believe you will be much easier when choosing to buy steel pipes.


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