In the purchase of steel pipe, the most important is identification of pipe quality, if you do not know how authentication method, it is possible to buy low-quality steel, which will have a greater impact for later use.
Shoddy steel pipe diameter size has big fluctuations, the reason have three kinds. First, steel temperature is unstable to cause different surfaces; second, the composition of the steel is uneven; third, due to poor equipment, low-foundation strength, or big mill bouncing, there will be a large change in the same week, such steel is easy to produce fracture because of discontinuity.
However, components of high-quality steel is uniform, cold shear tonnage is high, cut surface is smooth and tidy, shoddy materials section is uneven, and no metallic luster.
In addition, we should have a certain understanding for steel production materials, we can also view the quality of alloy steel pipe from the production material.