At present, there are many brands of seamless steel tube on the market. Seamless steel tube is widely used in construction, mechanical parts and other fields because of its light weight and the same bending and torsional strength. Seamless steel tube can be applied in many areas. The following seamless steel tube manufacturers will tell you what to pay attention to when purchasing seamless steel tube?

1. The transverse rib of the fake seamless steel tube is thin and low, and it is often not full. The reason is that the manufacturer exceeds the large negative dimensional tolerance. The plate wells are not full.

2. The section of the fake and inferior seamless steel tube is oval, the reason is that the manufacturer saves the raw material, the reduction amount of the first two passes of the finished product roll is slightly larger, the compressive strength of this kind of threaded steel is greatly reduced, and it does not match Specification for rebar dimensions.

3. The composition of high-quality seamless steel tube is well-proportioned, the tonnage of the cold shearing machine is high, and the inner hole of the cutting head is smooth and neat, while the inner hole of the cutting head often has the condition of falling meat due to poor material, that is, unevenness, And no metal texture. And because the counterfeit and inferior materials manufacturers have less cut ends, there will be big ears at the beginning and the end.

4. The fake and inferior seamless steel tube material contains a lot of residue, the density of the steel is small, and the specification deviation is relatively serious, so it can be checked for weighing without a micrometer. For example, for rebar 20, the national industry standard requires a larger negative dimensional tolerance of 5%. When the fixed length is 9M, its single weight is 120KG, and its minimum net weight should be: 120X (1-5%) = 114KG, If the specific net weight of a single piece weighed is smaller than 114KG, it is a fake and inferior seamless steel tube, because its negative dimensional tolerance exceeds 5%. Generally speaking, the actual effect of the whole equivalent amount will be stronger, and the key is to fully consider the problem of accumulation deviation and the theory of high rate.

5. The nominal diameter of the fake seamless steel tube fluctuates greatly, the reasons are: the steel temperature is not stable and there are positive and negative sides; the steel composition is not symmetrical; because of the simple equipment, the compressive strength of the roadbed is low, and the extruder jumps greatly. It will appear that the nominal diameter changes greatly in the same week, and the uneven support of such building steel bars is easy to cause cracks.

6. The trademark logo and hot stamping of high-quality materials are relatively standard.

7. The longitudinal bars of the fake seamless steel tube are often wavy.

Try to go to the dealers or dealerships of large and medium-sized seamless steel tube manufacturing enterprises to buy seamless steel tubes. The seamless steel tubes of such market sales units are directly supplied by the manufacturing enterprises, and the quality of seamless steel tubes is more guaranteed; Check the product quality certificate and the certificate number of the production license management method presented by the seamless steel tube manufacturing enterprise; you need to see the technical performance and labeling of the construction steel bar. The steel bar for construction should be rolled with the model mark, company name (or trademark logo) and diameter on its surface; pay attention to observation, the surface layer of seamless steel tube is not allowed to have defects such as cracks, scabs and expansion. There are difficulties mentioned, please pay attention.