镀锌管在钢筋型材行业中深入人心，深受大家的喜爱，但是我们在采购镀锌管时，也一定要掌握一些辨别产品优劣的技巧，帮助我们在选购时选择到优良的钢材。

Galvanized pipe is deeply rooted in the steel bar profile industry, and is deeply loved by everyone. However, when purchasing galvanized pipe, we must master some skills to distinguish the advantages and disadvantages of products, so as to help us choose the best steel when purchasing.

1．伪劣镀锌管容易刮伤，原因是伪劣镀锌管厂家设备简陋，易产生毛刺，刮伤钢材表面。深度刮伤降低钢材的强度。

1. Fake and inferior galvanized pipe is easy to be scratched. The reason is that the manufacturer's equipment is simple and easy to produce burr and scratch the steel surface. Deep scratch reduces the strength of the steel.

2．伪劣镀锌管无金属光泽，呈淡红色或类似生铁的颜色。

2. The fake and inferior galvanized pipe has no metallic luster and is light red or similar to pig iron color.

3．伪劣镀锌管的横筋细而低，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。

3. The transverse reinforcement of fake and inferior galvanized pipe is thin and low, and the phenomenon of insufficient filling often occurs. The reason is that in order to achieve large negative tolerance, the reduction of the first few passes of the finished product is too large, the iron mold is too small, and the pass is not fully filled.

4．伪劣镀锌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，这种管的强度大大地下降，而且也不符合钢管外形尺寸的标准。

4. The cross section of the fake and inferior galvanized pipe is oval. The reason is that in order to save materials, the reduction of the first two passes of the finished roll is too large, and the strength of the pipe is greatly reduced, and it does not conform to the standard of the external dimension of the steel pipe.

5．镀锌管的成分均匀，冷剪机的吨位高，切头端面平滑而整齐，而伪劣镀锌管由于材质差，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。而且由于伪劣厂家产品切头少，头尾会出现大耳子。

5. The composition of the galvanized pipe is uniform, the tonnage of the cold shear is high, and the end face of the cutting head is smooth and neat. However, due to the poor quality of the galvanized pipe, the end face of the cutting head often has the phenomenon of falling off, that is, uneven and without metallic luster. And because of the fake and inferior products cut less, head and tail will appear big ears.

6．伪劣镀锌管材质含杂质多，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。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。

6. The fake and inferior galvanized pipe material contains many impurities, the density of steel is too small, and the size is out of tolerance seriously, so it can be weighed and checked without vernier caliper. Generally speaking, the whole phase weighing effect will be better, mainly considering the cumulative error and probability theory.