最近市場出現(xiàn)了好多偽劣無縫異型鋼管，為了大家以后不再上當，今天在這里給大家簡單介紹一下鑒別的方法，供大家參考學習之用！1）偽劣無縫異型鋼管易出現(xiàn)折疊。折疊是無縫異型鋼管表面形成的各種折線，這種缺陷往往貫穿整個產品的縱向。產生折疊的原因是由于偽劣廠家追求高效率，壓下量偏大，產生耳子，下一道軋制時就產生折疊，折疊的產品折彎后就會開裂，無縫異型鋼管的強度大下降。

Recently there have been many fake and inferior cold-drawn seamless steel pipes in the market, in order that we will not be deceived in the future, here to give you a brief introduction to the identification method, for your reference and learning! 1) false and cold drawn seamless steel pipes are easy to fold. Folding is a variety of folding lines formed on the surface of cold-drawn seamless steel tube, which often run through the longitudinal of the whole product. The reason for folding is that the fake and inferior manufacturer pursues high efficiency, large reduction, ears, folding occurs in the next rolling, the folded product will crack after bending, and the strength of cold-drawn seamless steel pipe will be greatly reduced.

2）偽劣無縫異型鋼管外表經常有麻面現(xiàn)象。麻面是由于軋槽磨損嚴重引起無縫異型鋼管表面不規(guī)則的凹凸不平的缺陷。由于偽劣無縫異型鋼管廠家要追求利潤，經常出現(xiàn)軋槽軋制最超標。

2) the appearance of false cold drawn seamless steel pipe often has a phenomenon of pitting. Because of the serious wear and tear of the groove, the surface of the cold drawn seamless steel pipe is irregular and uneven. Because the manufacturers of fake and poor cold drawn seamless steel tubes should pursue profits, the rolling groove rolling often exceeds the standard.

3）偽劣無縫異型鋼管表面易產生結疤。原因有兩點：1．偽劣冷拔無縫異型鋼管材質不均勻，雜質多。2）偽劣材廠家導衛(wèi)設備簡陋，容易粘鋼，這些雜質咬人軋輥后易產生結疤。

3) the surface of the shoddy cold drawn seamless steel pipe is liable to produce scars. There are two reasons for this: 1. the material of the shoddy cold drawn seamless steel pipe is uneven and has many impurities. 2) fake and inferior material manufacturers have poor guiding and protecting equipment, which are easy to stick to steel.

4）偽劣材表面易產生裂紋，原因是它的坯料是土坯，土坯氣孔多，土坯在冷卻的過程中由于受到熱應力的作用，產生裂痕，經過軋制后就有裂紋。

4) The surface of fake and inferior materials is prone to cracks, because the billet is adobe, there are many pores in the adobe, the adobe is subjected to thermal stress in the cooling process, resulting in cracks, after rolling there are cracks.

5）偽劣無縫異型鋼管容易刮傷，原因是偽劣材廠家設備簡陋，易產生毛刺，刮傷無縫異型鋼管表面。深度刮傷降低冷拔無縫冷拔鋼管的強度。

5) The fake and inferior cold-drawn seamless steel pipe is easy to scratch, because the equipment of the fake and inferior material manufacturer is simple, easy to produce burrs and scratch the surface of the cold-drawn seamless steel pipe. Deep scratches reduce the strength of cold drawn seamless steel tubes.

6）偽劣無縫異型鋼管無金屬光澤，呈淡紅色或類似生鐵的顏色，原因有兩點二、它的坯料是土坯。2、偽劣材軋制的溫度不標準，他們的鋼溫是通過目測的，這樣無法按規(guī)定的奧氏體區(qū)域進行軋制，無縫異型鋼管的性能自然就無法達標。

6) The fake and inferior cold-drawn seamless steel tube has no metallic luster and is light red or similar to the color of pig iron. The reason is that its billet is adobe. 2. The rolling temperature of fake and inferior steel is not standard. Their steel temperature is measured visually, so it is impossible to roll according to the austenite region, and the performance of cold-drawn seamless steel tube can not reach the standard naturally.

7）偽劣無縫異型鋼管的橫筋細而低，經常出現(xiàn)充不滿的現(xiàn)象，原因是廠家為達到大的負公差，成品前幾道的壓下量偏大，鐵型偏小，孔型充不滿。

7) The transverse ribs of the fake and inferior cold-drawn seamless steel tubes are fine and low, and the phenomenon of filling and dissatisfaction often occurs. The reason is that in order to achieve a large negative tolerance, the reduction in the first few passes of the finished products is too large, the iron mold is too small, and the pass is not filled.

8）偽劣無縫異型鋼管的橫截面呈橢圓形，原因是廠家為了節(jié)約材料，成品輥前二道的壓下量偏大，這種螺紋鋼的強度大大地下降，而且也不符合螺紋鋼外形尺寸的標準。

8) The cross-section of the fake and inferior cold-drawn seamless steel pipe is elliptical, because the manufacturer in order to save material, the reduction of the first two rolls of the finished product is on the high side, the strength of this kind of thread steel is greatly reduced, and it does not conform to the standard of the shape and size of the thread steel.

9）優(yōu)質無縫異型鋼管的成分均勻，冷剪機的噸位高，切頭端面平滑而整齊，而偽劣材由于材質差，切頭端面常常會有掉肉的現(xiàn)象，即凹凸不平，并且無金屬光澤。而且由于偽劣材廠家產品切頭少，頭尾會出現(xiàn)大耳子。

9) High-quality cold-drawn seamless steel pipes have uniform composition, high tonnage of cold shears, smooth and tidy end face of cutting head, and fake and inferior wood due to poor material quality, the end face of cutting head often has the phenomenon of flesh drop, that is, uneven, and no metallic luster. Moreover, because the products of fake and inferior materials factories are few, there will be big ears at the head and tail.

10）偽劣無縫異型鋼管材質含雜質多，鋼的密度偏小，而且尺寸超差嚴重，所以在沒有游標卡尺的情況下，可以對它進行稱量核對。比如對于螺紋鋼 20，國家標準中規(guī)定最大負公差為 5％，定尺9M時它的單根理論重量為 120公斤，它的最小的重量應該是：120 X（l－5％）＝114公斤，稱量出來單根的實際重量比114公斤小，則是偽劣無縫異型鋼管，原因是它負公差超過了5％。一般來說整相稱量效果會更好，主要考慮到累積誤差和概率論這個問題。

10) The fake and inferior cold-drawn seamless steel pipes contain a lot of impurities, the density of the steel is small, and the dimension is out of tolerance seriously, so it can be weighed and checked without vernier calipers. For example, for screw steel 20, the maximum negative tolerance stipulated in the national standard is 5%, the theoretical weight of a single steel pipe is 120 kg at a fixed length of 9M, and its minimum weight should be 120 X (l-5%) = 114 kg. The actual weight of a single steel pipe weighed out is smaller than 114 kg, which is a pseudo-inferior cold-drawn seamless steel pipe because of its negative tolerance. More than 5%. Generally speaking, the whole phase weighing effect will be better, mainly considering the cumulative error and probability theory.

11）偽劣無縫異型鋼管的內徑尺寸波動較大，原因是；l、鋼溫不穩(wěn)定有陰陽面。2、鋼的成分不均勻。3、由于設備簡陋，地基強度低，軋機的彈跳大。會出現(xiàn)有同一周內內徑變化較大，這樣的鋼筋受力不均勻易產生斷裂。

11) The inner diameter of cold-drawn seamless steel pipe fluctuates greatly because of the unstable temperature of the steel with negative and negative surfaces. 2, the composition of steel is uneven. 3, as the equipment is poor, the strength of the foundation is low, and the rolling of the rolling mill is large. The internal diameter of the steel bar will change considerably in the same week, so the steel bar will be fractured if the force is uneven.

12）優(yōu)質材的商標和印字都比較規(guī)范。

12) the trademarks and printing of high quality timber are more standard.

13）三無縫異型鋼管直徑16以上的大螺紋，兩商標之間的間距都在IM以上。

13) three cold drawn seamless steel pipe with large diameter of 16 or more, and the distance between two trademarks is above IM.

14）偽劣無縫異型鋼管螺紋鋼的縱筋經常呈波浪形。

14) the longitudinal tendons of shoddy cold drawn seamless steel tubes are often wavy.

15）偽劣無縫異型鋼管廠家由于沒有行車，所以打包比較松散。側面呈橢圓形。

15) fake and poor cold drawn seamless steel tube manufacturers are not loose because they do not have any traffic. The side is oval.