The use of seamless steel pipes
is becoming wider and wider. When we choose seamless steel pipes, we must test the quality of seamless steel pipes. The following small series is detailed for everyone:
1. The fake and inferior seamless steel pipe is easy to be scratched, because the equipment of the fake and inferior seamless steel pipe manufacturers is simple, easy to produce burrs and scratch the surface of the steel. Deep scratches reduce the strength of the steel.
2. The counterfeit seamless steel pipe has no metallic luster and is light red or similar to pig iron.
3. The cross-fabricity of the counterfeit seamless steel pipe is thin and low, and the phenomenon of filling and dissatisfaction often occurs. 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, the iron type is small, and the hole type is not full.
4. The cross-section of the counterfeit semanufacturer has to reduce the amount of the two rolls in front of the finished roll in order to save material. The strength of this seamless steel pipe is greatly reduced, and it does not conform to the seamless steel pipe. The standard of the dimensions.
5. The composition of high-quality seamless steel pipe is uniform, the tonnage of the cold-shearing machine is high, the end face of the cutting head is smooth and tidy, and the surface of the inferior seamless steel pipe is often poor due to poor material, and the end face of the cutting head often has a phenomenon of falling meat, that is, unevenness, and no Metallic luster. And because the fake and inferior manufacturers have fewer heads, big ears will appear at the head and tail.
6. The fake and inferior seamless steel pipe material contains many impurities, the density of the steel is small, and the size is too bad, so in the absence of the vernier caliper, it can be weighed and checked. In general, the whole box weighing effect will be better, mainly considering the problem of cumulative error and probability theory.