Mine roof supports are an important part of mine support equipment. Due to the rapid development of mining, the use of mine roof supports has become more and more widespread. However, in the field of mine roof supports, there are often speculative merchants selling counterfeit or inferior steel to deceive the public. In the face of large and small steel companies, buyers often do not know how to distinguish the quality of steel. Today, our technical team has compiled a method for you to distinguish inferior steel. I hope you can gain something!
Inferior Mine roof supports are prone to scars
There are two reasons:
1. The material of fake and inferior steel is uneven and there are many impurities.
2. Fake and inferior material manufacturers have simple equipment and are easy to stick to steel, and these impurities are easy to cause scars.
Inferior Mine roof supports are prone to cracks
The reason is that the billet of the mine roof support is adobe, and the adobe has many pores. The adobe is subjected to thermal stress during the cooling process, and cracks are generated after rolling.
Inferior Mine roof supports are prone to folding
Folding is a variety of fold lines formed on the surface of the mine roof support, and this defect often runs through the longitudinal direction of the entire product. The reason for the folding is that the counterfeit manufacturers are pursuing high efficiency, and the pressing amount is too large, resulting in ears. The folding will occur during the next rolling. The folded product will crack after bending, and the strength of the mine roof support will be greatly reduced.
Inferior Mine roof supports often have pockmarked surface
The pitted surface is the irregularity of the surface of the steel due to the serious wear of the rolling groove. As shoddy mine roof support manufacturers are pursuing profits, groove rolling often exceeds standards.
Inferior Mine roof supports are easy to scratch
The reason is that the equipment of the fake and inferior material manufacturers is simple and easy to produce burrs and scratch the surface of the steel. Deep scratches reduce the strength of steel.
Inferior mine roof support has no metallic luster
It is light red or similar to the color of pig iron for two reasons: 1. The blank of the mine roof support is adobe. 2. The rolling temperature of fake and inferior materials is not standard, and their steel temperature is visually inspected, so that the rolling cannot be carried out in the specified austenite area, and the performance of the mine roof support will naturally not reach the standard.
Nowadays, there are a wide variety of Mine roof supports sold in the steel market. For many people who are not familiar with this industry, they will feel big when facing the strange market and be deceived if they are not careful. The main products of China Coal Group for mine support, steel rails, and steel plates are all directly shipped from large steel mills. The quality is guaranteed, so that customers can enjoy the most assured and reliable mine roof support products!
