廠傢介紹假冒偽劣冷拔鋼管的鑒別方法

1.偽劣冷拔無縫鋼管易出現折疊。折疊是冷拔無縫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於偽劣廠傢追求高效率，壓下量偏大，產生耳子，下一道軋制時就產生折疊，折疊的產品折彎後就會開裂，冷拔無縫鋼管的強度大下降。
1. The fake and inferior cold-drawn seamless steel pipe is easy to fold. Folding is a kind of folding line formed on the surface of cold-drawn seamless steel tube. This defect often runs through the longitudinal direction of the whole product. The reason for folding is that fake and inferior manufacturers pursue high efficiency, large reduction, and produce ears. Folding occurs in the next rolling process. Folded products will crack after bending, and the strength of cold-drawn seamless steel tube will decrease greatly. 2.偽劣冷拔無縫鋼管外表經常有麻面現象。麻面是由於軋槽磨損嚴重引起冷拔無縫鋼管表面不規則的凹凸不平的缺陷。由於偽劣冷拔無縫鋼管廠傢要追求利潤，經常出現軋槽軋制最超標。
2. The appearance of fake and inferior cold-drawn seamless steel tubes often has hemp surface. The flake surface of cold-drawn seamless steel pipe is irregular and uneven because of serious groove wear. As the fake and inferior cold-drawn seamless steel pipe manufacturers want to pursue profits, groove rolling often appears to exceed the standard.
3.偽劣冷拔無縫鋼管表面易產生結疤。原因有兩點：1.偽劣冷拔無縫鋼管材質不均勻，雜質多。2。偽劣材廠傢導衛設備簡陋，容易粘鋼，這些雜質咬人軋輥後易產生結疤。
3. Scar is easily formed on the surface of cold-drawn seamless steel tubes. There are two reasons: 1. The quality of fake and inferior cold-drawn seamless steel tube is not uniform and there are many impurities. 2. The guide equipment of fake and inferior material manufacturers is simple and easy to stick to steel. These impurities bite the roll and cause scarring easily.
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，土坯在冷透水地坪卻的過程中由於受到熱應力的作用，產生裂痕，經過軋制後就有裂紋。
4. Cracks are easy to occur on the surface of fake and inferior materials. The reason is that the billet is adobe and there are many air holes in the adobe. During the cooling process, the adobe is subjected to thermal stress, resulting in cracks, and there are cracks after rolling.
5.偽劣冷拔冷拔無縫鋼管容易刮傷，原因是偽劣材廠傢設備簡陋，易產生毛刺，刮傷冷拔無縫鋼管表面。深度刮傷降低冷拔無縫鋼管的強度。
5. The fake and inferior cold-drawn seamless steel pipe is easy to scratch, because the fake and inferior material manufacturer's equipment is simple, easy to produce burrs, scratch the surface of cold-drawn 彩色沥清地坪seamless steel pipe. Deep scratch reduces the strength of cold-drawn seamless steel tubes.
6.偽劣冷拔無縫冷拔鋼管無金屬光澤，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，這樣無法按規定的奧氏體區域進行軋制，冷拔無縫鋼管的性能自然就無法達標。
6. The fake and inferior cold-drawn seamless steel pipe has no metallic luster and is light red or similar to pig iron. There are two reasons. Its blank is adobe. 2. The rolling temperature of fake and inferior steel is not standard. Their steel temperature is measured by visual method, so it can't be rolled according to the prescribed austenite area, so the performance of cold-drawn seamless steel tube can't reach the standard naturally.
7.偽劣冷拔無縫鋼管的橫筋細而低，經常出現充不滿的現象，原因是廠傢為達到大的負公差，成品前幾道的壓下量偏大，鐵型偏小，孔型充不滿。
7. The transverse bars of fake and inferior cold-drawn seamless steel tubes are thin and low, and the phenomenon of filling is often unsatisfactory. The reason is that in order to achieve a large negative tolerance, the manufacturer has a large reduction in the first several passes of the finished products, a small iron shape and a unsatisfactory filling of the passes.
8.偽劣冷拔無縫鋼管的橫截面呈橢圓形，原因是廠傢為瞭節約材料，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. The reason is that in order to save material, the reduction of the front two passes of the finished roll is too large. The strength of this kind of thread steel decreases greatly, and it does not conform to the standard of the shape and size of the thread steel.
9.優質冷拔無縫鋼管的成分均勻，冷剪機的噸位高，切頭端面平滑而整齊，而偽劣材由於材質差，切頭端面常常會有掉肉的現象，即凹凸不平，並且無金屬光澤。而且由於偽劣材廠傢產品切頭少，頭尾會出現大耳子。
9. High-quality cold-drawn seamless steel pipe has uniform composition, high tonnage of cold shearing machine, smooth and neat end face of cutting head, while fake and inferior materials, due to poor material quality, often have the phenomenon of meat loss at the end face of cutting head, that is, uneven, and no metallic luster. And because the products of fake and inferior material manufacturers cut little, big ears will appear at the end.
10.偽劣冷拔無縫鋼管材質含雜質多，鋼的密度偏小，而且尺寸超差嚴重，所以在沒有遊標卡尺的情況下，可以對它進行稱量核對。比如對於螺紋鋼 20，國傢標準中規定最大負公差為 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，則是偽劣冷拔無縫鋼管，原因是它負公差超過瞭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 pipe material contains many impurities, the density of the steel is small, and the dimension is excessive, so it can be weighed and checked without vernier calipers. For example, for screw steel 20, the national standard stipulates that the maximum negative tolerance is 5%, and the theoretical weight of a single pipe is 120 kg at a fixed length of 9M. Its minimum weight should be 120 X (l-5%) = 114 kg. The actual weight of a single pipe weighed out is smaller than 114 kg. It is a pseudo-inferior cold-drawn seamless steel pipe, because its negative tolerance exceeds 5%. Generally speaking, the effect of integer phase weighing is better, mainly considering the problem of cumulative error and probability theory.