• 2019/07/17 /  其他

    Processing a DIN 933 bolt, the process is very complicated, after a number of procedures, and strict high-strength bolts of each process can be considered as basically qualified. In order to fully comply with the pre-designed standards, it is necessary to undergo more rigorous tests, as well as reasonable storage, transportation and proper installation, in order to play the real role of a high-strength bolt.

    One process in the high-strength bolt manufacturing process is to improve the overall mechanical properties of the fastener, which is the heat treatment process. This process has a very important influence on the intrinsic quality of high-strength bolts, especially high-strength bolts.

    With the development of the times, the continuous heat treatment production line with protection after the 1990s has taken the lead. In addition to the excellent sealing performance of the furnace, the temperature and process parameters are very accurate with computer control, and the equipment fault alarm and display functions are also available. During the whole process of quenching and tempering heat treatment, some oxidized gas will be brought from the outside of the furnace. The reaction of a series of chemical changes with the surface rust of the high-strength bolt will cause the high-strength bolt material itself to decarburize. According to the research of the technicians, the decarburization degree of medium carbon alloy steel is more serious than that of carbon steel, and the fastest decarburization temperature is between 700 and 800 degrees Celsius. Mainly because the object attached to the surface of the steel wire decomposes the compound very quickly under certain conditions. If the control of the continuous mesh belt furnace gas is not good, it will also cause the screw decarburization. When the high-strength bolt is used in the cold head forming process, the original material is not only still present in the annealed decarburized layer, but also extruded to the top of the high-strength bolt thread. At this time, the high-strength bolt surface that needs quenching is not obtained. Pre-designed hardness requirements, at this time the mechanical properties of high-strength bolts will be greatly reduced.

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  • 2019/07/12 /  其他
    瀏覽人數: 20

    Steel structure Square Bolt are mainly used in steel structure engineering. They are used to connect the connection points of steel structural steel plates. Iron will rust, but steel structure square bolts are not easy to rust, but it is difficult in some special circumstances. To avoid the problem of rust, for example, it may cause rust after being corroded by natural weather in a long-term humid environment at the seaside. Generally, it can be solved by replacing it. Steel-structured square bolts can cause rust if they are drenched by rain or if some liquid is drenched. Erosion of bird droppings in areas rich in sea water is the cause of rusting of steel-structured square bolts. In order to solve this problem, we must take corresponding actions to take measures against moisture in the steel structural square bolts.

    There are still methods for moisture protection. Solvent-free paints can be used. Impregnating varnishes containing no oxidizing components, such as epoxy urethane or undenatured epoxy immersion varnish, are used here.

    The use of these paints can effectively protect the steel structure anchor bolts. This is a good isolation and reuse for the moisture in the air. The main steel structure square bolts do not oxidize and rust, and the hardness performance of the steel can be ensured. Lost, thus ensuring the fastening fastness of the anchor bolts and the safe use of the corresponding equipment.

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  • 2019/07/10 /  個人
    瀏覽人數: 11

    Do you know that more than 200 billion bolts are used each year? Due to the high demand, the screw, nut and bolt industries are certainly booming. However, there are not only these three types to choose from; if you are not sure if you want to turn to your next project for custom shoulder bolts or custom screws, finding the answer may be more complicated than you might think. Today, we will pay special attention to bolts and answer the most common questions about giant categories.

    What is the mark displayed on the bolt head?
    In general, the bolt head contains two types of markings: the manufacturer’s markings and rating markings. The former identifies the manufacturer or importer; they assume responsibility for the bolts meeting the specified requirements. The level mark is an identification mark that identifies the material properties encountered by the bolt.

    I can’t find the shear strength of the bolt in the specification. Can you help?
    Bolt shear joints can be designed for friction clamping or direct shearing. When using friction clamping joints, it must be ensured that the friction generated by the bolts is sufficient to prevent slippage between the plates and damage the joint. For direct shear joints, the shank of the bolt is directly subjected to shear forces, creating shear stress in the bolt.

    What are the benefits of fine threaded bolts over coarse threaded bolts?
    Traditionally, thick threads are specified unless there is another reason to use fine threads. Dimensions, thin lines are stronger than thick lines, whether stretching or shearing. Due to the small inclination of the threads, the fine threads also have a less tendency to loosen; at the same time, the smaller spacing allows for finer adjustments in applications requiring such features.

    Haiyan Yihui Hardware Technology Co., Ltd. is your bolt manufacturing expert. We provide you with a comprehensive range of products. At the same time, our DIN 933 bolts are more accurate and durable. Welcome customers who are interested to contact us.

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