Stainless Steel Holding Down Timber Coil Thread Eye Bolts Manufacturer

If we use a magnifying glass to observe a Hex Head Stainless Bolt with quality problems that cannot be seen by the naked eye, then we can see that the surface of the bolt will appear a little loose. In serious cases, there will be some bubbles and white spots similar to air filling, which are the reasons that directly affect the strength of the stainless steel bolt. We call this condition a loose segregation defect of material and tissue.

In the industrial field, the utilization rate of Stainless Steel Holding Down Bolts has reached about 30% of the whole fastener products and continues to rise. To make better and rational use of Hex Head Stainless Bolts and ensure the stable quality of Hex Head Stainless Bolts, a correct way and method are needed to judge some unconventional quality problems of Hex Head Stainless Bolts.

Before production, the materials of Coil Thread Eye Bolts need to go through a series of technological processes such as cold rolling, acid steam, and polishing. After rough grinding, some materials also need to use some fine sand grinding process to eliminate some burrs on the material surface, to ensure the cleanliness of Hex Head Stainless Bolts.

The problem of material looseness at this time refers to the situation that which the density of the material itself is not high enough. The reason for this situation is that there are too many impurities concentrated in this place. After a long time of corrosion, the bubble phenomenon gradually appears. If this phenomenon appears on the cross-section of the bolt, its influence will not be so great. If it appears on the straight line of the rod of the bolt, it means that the central part of the bolt may have looseness. At this time, we need to focus on this problem. We can use professional testing instruments to test the degree of damage to the strength of the bolt.

What is segregation?

To put it simply, the elements of the material are unevenly distributed. If you observe it with a microscope, you will find that the internal structure of the material is like a tree technique, and some unevenly distributed in various other shapes, such as squares, dots, etc. This kind of distribution of our common branch state is caused by the temperature change of the material in the formation process. When there is a temperature difference, there will be coarse and fine marks on the cloth of the material. When the temperature changes again, the second and third branches will be extended from the first segregation line... So it forms the final branch distribution shape. Although segregation is common and cannot be eliminated, if the segregation state is too serious, it will affect the strength of bolts.

Bubble and small hole residue is a small cavity formed by the material in the process of condensation. Individual bubbles are also in a normal state. If there are honeycomb bubbles, it is a quality problem. Due to the continuous change of temperature, there is a little difference in the time when the molecular structure of the material slowly condenses. When there is a stain in the material, white stains or bubbles will be formed.

In addition to the influence of temperature change, many bubbles are retracted due to inclusions in the material. Bolt materials are synthesized from various alloy materials after high-temperature smelting, while different alloy materials have high and low melting point temperatures. In the process of melting synthesis, alloy materials with high melting points are easy to leave some residues, resulting in the formation of bubbles. The smelting environment of bolt materials is also very important. Don't think that it works in an open environment, which can ignore a large number of adverse factors in the environment. On the contrary, large particles of dust and metal particles in the environment are important factors causing quality problems.

When the bolt surface is serious, there will not only be white spots but even obvious cracks. The impact of this crack is the most serious of all quality problems. It has a significant impact on the mechanical properties of the bolt and must not occur in material smelting. To ensure that there is no crack on the bolt surface, we should use professional ultrasonic instruments to practice whether the internal structure of the bolt is abnormal, which is a very important testing link.

In short, for Stainless Steel Holding Down Bolts, segregation, white spots and cracks are unacceptable quality phenomena. For the above-mentioned quality problems, when materials enter the factory and finished products leave the factory, there must be a strict inspection system to establish a high-standard quality judgment mechanism. Only by putting quality problems in the top priority position can the enterprise develop healthily.

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