Release time：2020-01-16 18:44 Browse：
In the field of engineering and construction, choosing the right fasteners is crucial, which is directly related to the stability and safety of the structure. Stainless steel long screws and high-strength carbon steel long screws, as common fasteners, each show unique advantages in different scenarios. In this paper, the differences between the two are analyzed from the aspects of hardness, corrosion resistance and salt spray corrosion resistance, and their respective application scenarios are discussed.
Hardness contrast
First of all, from the hardness point of view, high-strength carbon steel long screws usually have higher hardness. After heat treatment, the hardness of carbon steel screws can reach HRC30-35 or even higher, which makes them able to withstand greater torque and shear forces. In contrast, the hardness of stainless steel screws is low, generally between HRC18-24, although this does not affect the use of most of its application scenarios, but in the case of extremely high requirements for hardness, carbon steel screws are more suitable.
Corrosion resistance
In terms of anti-corrosion performance, stainless steel long screws show unparalleled advantages. The reason why stainless steel is resistant to corrosion is that the chromium element contained inside reacts with oxygen in the air to produce a dense chromium oxide protective layer, which can effectively isolate the corrosive medium and protect the screws from erosion. Even if the protective layer is damaged for some reason, the chromium inside will continue to react with oxygen and repair the protective layer itself. This characteristic makes stainless steel screws especially suitable for humid, corrosive environments, such as chemical industry, seawater treatment and other fields.
In contrast, the corrosion resistance of carbon steel screws is weak, although the surface treatment can be carried out by electroplating, spraying and other ways to enhance its corrosion resistance, but once these coatings are damaged, it is difficult to repair themselves like stainless steel, resulting in rapid corrosion of the screws. Therefore, in the case of higher anti-corrosion requirements, stainless steel screws are a more ideal choice.
Salt spray corrosion resistance
Salt spray environment is one of the important criteria for testing corrosion resistance of materials. Stainless steel screws perform particularly well in salt spray environments due to their excellent corrosion resistance. The experimental data show that the corrosion rate of stainless steel screws in the salt spray environment is much lower than that of carbon steel screws, and can even reach less than 1/10,000 of carbon steel. This excellent resistance to salt spray corrosion makes stainless steel screws the first choice for fasteners in Marine engineering, coastal construction and other fields.
Different application scenarios
Application scenario of stainless steel long screws
Chemical industry: Due to the presence of various corrosive media in the chemical environment, stainless steel screws are widely used in the installation and fastening of chemical equipment because of their excellent corrosion resistance.
Marine engineering: The high salinity, high humidity and tidal action of seawater put forward extremely high requirements for fasteners, and stainless steel screws become the ideal choice for Marine engineering because of their excellent salt spray corrosion resistance.
Food processing industry: In the process of food processing, it is necessary to ensure that the equipment material is non-toxic and harmless, and stainless steel screws are favored for their good hygiene and corrosion resistance.
Application scenario of high strength carbon steel long screws
Heavy machinery equipment: In heavy machinery equipment with high load and high stress, high strength and high hardness fasteners are needed to ensure the stability and safety of the equipment. At this time, high-strength carbon steel long screws become the first choice because of their excellent mechanical properties.
Bridges and building structures: In the construction process of large Bridges and high-rise buildings, a large number of high-strength fasteners need to be used to connect and fix the various structural components. Carbon steel screws have high strength and hardness after heat treatment, which can meet the strict requirements of fasteners in these occasions.
Aerospace field: The aerospace field is extremely demanding on materials, not only requires materials with high strength, high hardness, but also needs to have good fatigue resistance and stability. High strength carbon steel long screws are widely used in the manufacture of aerospace equipment because of their excellent comprehensive properties.
In summary, stainless steel long screws and high-strength carbon steel long screws each have their unique advantages and application scenarios. In the selection, should be based on the specific use of the environment, load requirements and cost considerations and other factors for comprehensive consideration, to ensure that the selected fasteners can meet the engineering needs and ensure the safety and stability of the structure.
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