How to Identification of fake seamless steel pipe

Fake seamless steel pipe identification method
The identification method and inferior steel pipe:
1. And inferior steel tube folding is seen. Folding is formed on the surface of the pipe line, this kind of defect often throughout the entire product longitudinal. Causes of fold is due to the pursuit of the false and inferior, high efficiency, large reduction, handle, when the next rolling produce folding, folding products will be cracking after bending, strength of steel.
(2) and inferior steel tube appearance often have pitted surface phenomenon. Pits was caused by worn groove steel irregular uneven defects. Because want to pursuit of profit and inferior steel pipe manufacturer, often appear groove rolling the overweight.
(3) and inferior steel tube surface are prone to scarring. For two reasons: (1) and inferior steel pipe material uneven, impurities. (2). And inferior manufacturer guide equipment simple, easy to stick steel, these impurities
4. Easy generation and inferior material surface crack, the reason is that it's blank is adobe, adobe air, adobe in cooling process due to the effect of thermal stress, cracks, after rolling there is crack.
5. Easy to scratch and inferior steel pipe, the reason is false and inferior steel pipe factory equipment simple, easy to produce burr, scratch steel surfaces. Deep scratches to reduce the strength of the steel.
6. No metallic luster and inferior steel tube, reddish, or two point two, the billet is adobe reasons. 2, and inferior material rolling temperature is not standard, their steel temperature is through visual inspection, so can't austenitic area of the rolling by the regulation, the performance of the steel natural can't up to standard.
7. And inferior steel pipe transverse reinforcement and low, often appear as disgruntled phenomenon, the reason was that the manufacturer for big minus tolerance, the finished product before several pressure
8 and inferior steel tube cross-section oval, because the factory in order to save material, the quantity of the finished product roll before 2 slants big, the strength of rebar is greatly decreased, but also do not conform to the standard of rebar shape size.
9. The high quality steel composition is uniform, cold shearing machine high tonnage, cutting head end face smooth and neat, and shoddy material because the material is poor, cutting head end face often have meat, or uneven, and no metallic luster. And because the manufacturers cut head, end there will be a big handle.
More than 10. And inferior impurities in steel pipe material, steel small density, size and do poorly in the absence of vernier caliper, can be checked to weigh it. Such as for rebar, 20 biggest minus tolerance specified in the national standard of 5%, scale 9 m in the theory of single weight is 120 kg, it should be the smallest weight: 120 X (l - 5%) = 114 kg, weigh out the weight of the single is smaller than 114 kilograms, is false and inferior steel %. In general the whole amount to match the effect will be better, mainly considering the cumulative error and probability theory to this problem.
11. And inferior steel pipe diameter is volatile, the reason is; L, the steel temperature instability has Yin and Yang. 2, the composition of steel is not uniform. 3, due to poorly equipped, foundation strength is low, mill's bounce. There will be a larger changes within the same week, the steel bar caused by uneven on fracture.
12. The high quality tube logo and printing are specification.
13. More than three steel pipe diameter 16 spacing are over IM.
14. And inferior steel rebar longitudinal reinforcement often undulate.

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