Shenzhen Shengjinlong Iron and Steel Co., Ltd.

0755-89345123

215088612@qq.com

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Shenzhen Shengjinlong Iron and Steel Co., Ltd.


Contact: Mr. Wu


Contact number: 0755-89345123


Mobile: 13682609066


E-mail: 215088612@qq.com


Address: No. 06, Building A, Building Materials Market, Pingshan New District, Shenzhen


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Shenzhen Building Materials Factory teaches you how to identify the true and false of the square tube

Shenzhen Building Materials Factory is a building material with a relatively large amount of construction in today's construction industry. Due to the large market demand, many steel products are also emerging. The quality is uneven. Don't worry, the following Shenzhen Building Materials Factory Sheng Jinlong Steel for everyone to support!

Fake and inferior tubes are prone to folding. Folding is a variety of fold lines formed on the surface of a square tube that tends to extend throughout the longitudinal direction of the product. The reason for the folding is that the inferior manufacturer pursues high efficiency, the amount of pressing is too large, and the ear is generated, and the next rolling causes folding, and the folded product is cracked after being bent, and the strength of the steel is greatly reduced. The surface of the fake and inferior tube often has a pockmark phenomenon. The pockmark is a defect caused by the irregularity of the surface of the steel due to the serious wear of the groove.

Due to the pursuit of profit by the manufacturers of counterfeit square pipes, the rolling mills are often super-rolled, and the surface of the counterfeit square pipes is prone to scarring. There are two reasons for this: the fake and inferior square tube material is uneven and has many impurities. The factory guide equipment of the fake and inferior square tube is simple and easy to stick steel. These impurities are prone to scarring after rolling. The surface of the fake inferior material is prone to cracks because the billet is an adobe, and the adobe has many pores. The adobe is cracked by the action of thermal stress during the cooling process, and cracks occur after rolling.

The counterfeit thick-walled pipe is easy to be scratched because the equipment of the fake and inferior pipe manufacturer is rudimentary, easy to produce burrs and scratch the surface of the steel. Deep scratches reduce the strength of the steel. The counterfeit thick-walled seamless square tube has no metallic luster and is light red or similar to pig iron. The reason is two points. The blank is adobe. The temperature of the fake inferior material rolling is not standard, and their steel temperature is measured by visual inspection, so that the rolling can not be carried out according to the specified austenite region, and the performance of the steel is naturally unable to reach the standard.

The transverse ribs of the counterfeit square tube are thin and low, and the phenomenon of filling and dissatisfaction often occurs. The reason is that the manufacturer has to achieve a large negative tolerance, the amount of reduction of the first few passes of the finished product is too large, the iron type is small, and the hole type is not full. The cross section of the counterfeit square tube is elliptical. The reason is that the manufacturer has to reduce the amount of pressure in front of the finished roller in order to save material. The strength of the square tube is greatly reduced, and it does not meet the standard of the square tube.

The composition of high-quality steel is uniform, the cold-shearing machine cuts, the end face of the cutting head is smooth and tidy, and the fake inferior material is often poor in material, and the end face of the cutting head often has a phenomenon of falling meat, that is, unevenness and no metallic luster. And because the fake inferior products manufacturers have fewer heads, big ears will appear at the head and tail. The material of the counterfeit square tube contains many impurities, the density of the steel is small, and the size is too bad, so in the absence of the vernier caliper, it can be weighed and checked.

The above content is a method for identifying the fake and inferior square tube. Very practical tips, you also want to know more about Shenzhen Building Materials Factory and Shenzhen profile manufacturers, please continue to pay attention to Shenzhen Shengjinlong Iron and Steel Co., Ltd. dynamic!