How to distinguish steel pipes of different standards
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For a steel pipe made of 20# material, how do you determine which standard it follows (is it GB3087, GB/T8163, GB9948, or GB6479)?
Manufacturing plant marking transplantation, huh. Otherwise, there aren’t many options
The standard to be followed can be determined by checking the markings on the end of the steel pipe
Steel pipes usually have model markings, which can be used to identify the standard type.
But if someone changes the labels, how can one identify and distinguish them?
If, after the re-labeling, the false is removed and the true is retained
If there are no markers, it is indeed very difficult to distinguish; it’s also hard to conduct standard physical and chemical tests in such cases
That means others change the standards, selling products that meet lower standards as if they met higher ones; those who use such products have no way to control this situation. In case of any problems, it’s also impossible to determine whether the wrong standard was used
Steel pipes usually have model markings, which can be used to identify the standard type.
It is indicated on the manufacturer’s certificate of conformity or material certificate.
When it comes to pressure pipes, sales and usage units pay great attention to them; they do not dare to sell or use such pipes without reliable quality certifications and traceability evidence. For large quantities of new materials, the markings on the pipes themselves should be clearly visible, otherwise purchasers will not be inclined to make purchases. What was mentioned above refers to pipes that are not marked; this generally implies the loss of markers on transplanted pipes. It involves small numbers of such pipes, and the best approach for such materials is to use them at a lower grade, as the cost of making distinctions between them is too high.