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1. Fake thick-walled seamless steel pipe is prone to folding. Folding is a thick line of seamless steel pipe surface formed a variety of polylines, this defect often runs through the entire product longitudinal. The reason for the folding is due to the pursuit of high efficiency of the manufacturers, the amount of pressure is too large, resulting in the ear, the next rolling to produce folding, folding products will crack after bending, thick-walled seamless steel pipe strength The
2. The appearance of the shameless thick-walled seamless steel pipe is often pimple. Ma face is due to the serious wear and tear caused by thick groove seamless steel pipe surface irregular rugged defects. As the shoddy thick-walled seamless steel pipe manufacturers to pursue profits, often rolling rolling the most standard.
3. Seamless thick-walled seamless steel pipe surface is easy to produce scar. There are two reasons: 1. Seamless thick-walled seamless steel pipe material is not uniform, more impurities. 2. Pseudo-poor material manufacturers guide the equipment is simple, easy to stick steel, these impurities are easy to produce a scar after bite.
4. The surface of the fake material is prone to crack, because its blank is adobe, adobe pores and more adobe in the cooling process due to the role of thermal stress, resulting in cracks, after rolling cracks.
5. Shameless thick-walled seamless steel pipe is easy to scratch, because the pseudo-poor equipment manufacturers simple, easy to produce burr, scratch thick-walled seamless steel pipe surface. Deep scratching reduces the strength of thick - walled seamless steel tubes.
6. Fake thick-walled seamless steel pipe without metallic luster, pale or similar to the color of pig iron, there are two reasons, its blank is adobe. 2, pseudo-poor material rolling temperature is not standard, their steel temperature is through the visual, so can not according to the provisions of the austenitic area rolling, thick-walled seamless steel pipe performance naturally can not meet the standard.
7. Seamless thick-walled seamless steel pipe is thin and low, often appear full of dissatisfaction with the phenomenon, because the manufacturers to achieve a large negative tolerance, the number of products before the reduction of the amount of large, iron-type small,
8. False thick thick-walled seamless steel pipe cross-section was oval, because the manufacturers in order to save the material, finished roll two before the pressure is too large, the strength of this rebar greatly reduced, and does not meet the size of rebar The standard.
9. High-quality thick-walled seamless steel pipe composition evenly, cold shear machine tonnage high, cut the end of the smooth and tidy, and pseudo-poor material due to poor quality, cut the end of the face often have the phenomenon of meat, that is uneven, and no metallic luster The And because the false product manufacturers cut off the small head, head and tail will appear big ears.
10. Seamless thick-walled seamless steel pipe material containing impurities, steel density is too small, and the size of the ultra-serious, so in the absence of vernier caliper, it can be weighed check. For example, for rebar 20, the national standard specifies a maximum negative tolerance of 5%, the length of 9M when its single theoretical weight of 120 kg, its minimum weight should be: 120 X (l-5%) = 114 kg , Weighing out the actual weight of a single 114 kg smaller, it is shoddy thick-walled seamless steel pipe, because it is more than 5% of the negative tolerance. In general, the overall effect of weighing will be better, mainly taking into account the cumulative error and probability theory of this problem.
11. The diameter of the fouling thick-walled seamless steel pipe is large, because: l, the steel temperature is unstable. 2, the composition of steel is not uniform. 3, due to poor equipment, low ground strength, rolling bounce large. There will be a larger change in the same diameter within the same week, so that the uneven force of steel tend to produce fracture.
12. High-quality trademarks and printing are more standardized.
13. Three thick-walled seamless steel pipe diameter of 16 or more large thread, the gap between the two trademarks are above IM.
14. The longitudinal reinforcement of the shameless thick-walled seamless steel pipe is often wavy.
15. Shoddy thick-walled seamless steel pipe manufacturers because there is no traffic, so the packaging is relatively loose. Side oval.

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