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    厂家介绍假冒伪劣冷拔钢管的鉴别方法

    2018-11-29 13:59:30 无锡盛发地坪科技有限公司 阅读

    1.伪劣冷拔无缝钢管易出现折叠。折叠是冷拔无缝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,冷拔无缝钢管的强度大下降。

    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.伪劣冷拔无缝钢管外表经常有麻面现象。麻面是由于轧槽磨损严重引起冷拔无缝钢管表面不规则的凹凸不平的缺陷。由于伪劣冷拔无缝钢管厂家要追求利润,经常出现轧槽轧制最超标。

    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.伪劣冷拔无缝钢管表面易产生结疤。原因有两点:1.伪劣冷拔无缝钢管材质不均匀,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. 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.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. 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.伪劣冷拔冷拔无缝钢管容易刮伤,原因是伪劣材厂家设备简陋,易产生毛刺,刮伤冷拔无缝钢管表面。深度刮伤降低冷拔无缝钢管的强度。

    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 seamless steel pipe. Deep scratch reduces the strength of cold-drawn seamless steel tubes.

    6.伪劣冷拔无缝冷拔钢管无金属光泽,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,冷拔无缝钢管的性能自然就无法达标。

    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.伪劣冷拔无缝钢管的横筋细而低,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 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.伪劣冷拔无缝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. 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.优质冷拔无缝钢管的成分均匀,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 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.伪劣冷拔无缝钢管材质含杂质多,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,则是伪劣冷拔无缝钢管,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 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.



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