最近市场出现了好多伪劣无缝异型钢管，为了大家以后不再上当，今天在这里给大家简单介绍一下鉴别的方法，供大家参考学习之用！1）伪劣无缝异型钢管易出现折叠。折叠是无缝异型钢管表面形成的各种折线，这种缺陷往往贯穿整个产品的纵向。产生折叠的原因是由于伪劣厂家追求高效率，压下量偏大，产生耳子，下一道轧制时就产生折叠，折叠的产品折弯后就会开裂，无缝异型钢管的强度大下降。
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）伪劣无缝异型钢管外表经常有麻面现象。麻面是由于轧槽磨损严重引起无缝异型钢管表面不规则的凹凸不平的缺陷。由于伪劣无缝异型钢管厂家要追求利润，经常出现轧槽轧制最超标。
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）伪劣无缝异型钢管表面易产生结疤。原因有两点：1．伪劣冷拔无缝异型钢管材质不均匀，杂质多。2）伪劣材厂家导卫设备简陋，容易粘钢，这些杂质咬人轧辊后易产生结疤。
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）伪劣材表面易产生裂纹，原因是它的坯料是土坯，土坯气孔多，土坯在冷却的过程中由于受到热应力的作用，产生裂痕，经过轧制后就有裂纹。
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）伪劣无缝异型钢管容易刮伤，原因是伪劣材厂家设备简陋，易产生毛刺，刮伤无缝异型钢管表面。深度刮伤降低冷拔无缝冷拔钢管的强度。
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）伪劣无缝异型钢管无金属光泽，呈淡红色或类似生铁的颜色，原因有两点二、它的坯料是土坯。2、伪劣材轧制的温度不标准，他们的钢温是通过目测的，这样无法按规定的奥氏体区域进行轧制，无缝异型钢管的性能自然就无法达标。
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）伪劣无缝异型钢管的横筋细而低，经常出现充不满的现象，原因是厂家为达到大的负公差，成品前几道的压下量偏大，铁型偏小，孔型充不满。
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）伪劣无缝异型钢管的横截面呈椭圆形，原因是厂家为了节约材料，成品辊前二道的压下量偏大，这种螺纹钢的强度大大地下降，而且也不符合螺纹钢外形尺寸的标准。
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）优质无缝异型钢管的成分均匀，冷剪机的吨位高，切头端面平滑而整齐，而伪劣材由于材质差，切头端面常常会有掉肉的现象，即凹凸不平，并且无金属光泽。而且由于伪劣材厂家产品切头少，头尾会出现大耳子。
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）伪劣无缝异型钢管材质含杂质多，钢的密度偏小，而且尺寸超差严重，所以在没有游标卡尺的情况下，可以对它进行称量核对。比如对于螺纹钢 20，国家标准中规定最大负公差为 5％，定尺9M时它的单根理论重量为 120公斤，它的最小的重量应该是：120 X（l－5％）＝114公斤，称量出来单根的实际重量比114公斤小，则是伪劣无缝异型钢管，原因是它负公差超过了5％。一般来说整相称量效果会更好，主要考虑到累积误差和概率论这个问题。
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）伪劣无缝异型钢管的内径尺寸波动较大，原因是；l、钢温不稳定有阴阳面。2、钢的成分不均匀。3、由于设备简陋，地基强度低，轧机的弹跳大。会出现有同一周内内径变化较大，这样的钢筋受力不均匀易产生断裂。
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）优质材的商标和印字都比较规范。
12) the trademarks and printing of high quality timber are more standard.
13）三无缝异型钢管直径16以上的大螺纹，两商标之间的间距都在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）伪劣无缝异型钢管螺纹钢的纵筋经常呈波浪形。
14) the longitudinal tendons of shoddy cold drawn seamless steel tubes are often wavy.
15）伪劣无缝异型钢管厂家由于没有行车，所以打包比较松散。侧面呈椭圆形。
15) fake and poor cold drawn seamless steel tube manufacturers are not loose because they do not have any traffic. The side is oval.
