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Method for identifying fake and inferior seamless steel pipes

2019-07-29 10:45:13   COMMENT:0 HITS:
  1. Fake and inferior seamless steel pipes are easy to fold.

  Folding is a kind of broken line formed on the surface of seamless steel pipe. This defect often runs through the longitudinal direction of the whole product. The reason for folding is that fake and inferior manufacturers pursue high efficiency, large reduction and produce ears. Folding seamless steel pipes will crack after bending, and the strength of steel decreases greatly.

  2. The appearance of fake and inferior seamless steel pipes is often hemp-faced.

  The flake surface is a defect of irregular concave and uneven surface of seamless steel pipes due to serious groove wear. Because the fake and inferior seamless steel pipes manufacturers want to pursue profits, rolling grooves often exceed the standard.

  3. Scars are easily formed on the surface of fake and inferior seamless steel pipes.

  There are two reasons: (1). The quality of fake and inferior seamless steel pipes is not uniform and there are many impurities. (2) The guide equipment of fake and inferior material manufacturers is simple and easy to stick to seamless steel pipes. These impurities bite the roll and cause scarring easily.

  4. Cracks are easy to occur on the surface of fake and inferior materials. The reason is that the billet is adobe and there are many air holes in the adobe. During the cooling process, the adobe is subjected to thermal stress, resulting in cracks and cracks after rolling.Our company's API 5L PSL1 Seamless Steel Pipe quality is guaranteed, there are no inferior products.

  5. Fake and inferior seamless steel pipes are easy to scratch. The reason is that fake and inferior seamless steel pipes manufacturers have poor equipment and are liable to produce burrs and scratch the surface of steel. Deep scratch reduces the strength of steel.

  6. Fake and inferior seamless steel pipes have no metallic luster and are light red or similar to pig iron. There are two reasons. Its blank is adobe. 2. The rolling temperature of fake and inferior products is not standard. Their steel temperature is measured by visual method, so that they can not be rolled according to the prescribed austenite region, and the properties of steel can not meet the standard naturally.

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