How to distinguish the quality of seamless steel pipe

1. The composition of high-quality seamless steel pipe is uniform, the tonnage of the cold shear machine is high, and the cut end face is smooth and neat. However, due to poor material quality, the cut end face of fake and inferior materials often has flesh loss, that is, it is uneven and has no metallic luster. And because products produced from fake and inferior materials have fewer heads, big ears will appear at the head and tail.
2. Fake and shoddy seamless steel pipes have no metallic luster and are light red or similar in color to pig iron. There are two reasons why the blank is made of adobe. The rolling temperature of the shoddy and shoddy materials is not standard. The steel temperature is measured visually, so it cannot be determined as specified. When rolling is performed in the austenite region, the performance of thick-walled seamless steel pipes will naturally fail to meet the standards.
3. The material of fake and inferior seamless steel pipe contains many impurities, the density of the steel is small, and the size is seriously out of tolerance, so it can be weighed and checked without a vernier caliper.
4. The cross-section of fake and inferior seamless steel pipe is oval. The reason is that in order to save materials, the factory has a larger reduction amount in the first two passes of the finished roller. The strength of this kind of rebar is greatly reduced, and it does not meet the overall dimensions of the rebar standards.
5. The surface of fake and inferior seamless steel pipes is prone to scarring. There are two reasons: First, the material of fake and inferior thick-walled seamless steel pipes is uneven and contains many impurities. Second, the guide equipment in the factory of fake and inferior materials is simple and easy to stick to steel. These impurities are easy to cause scarring after rolling.
6. The surface of fake and inferior materials is prone to cracks because its raw material is adobe, which has many pores. The adobe is subject to thermal stress during the cooling process, causing cracks, and cracks appear after rolling.

Article source: https://article-realm.com/article/Business/61604-How-to-distinguish-the-quality-of-seamless-steel-pipe.html