Release time：2020-01-16 18:44 Browse：
In the world of fasteners, stainless steel extension screws and carbon steel screws are two very common and important types. They each have unique performance characteristics and are widely used in different industries and fields. This article will discuss the difference between stainless steel extension screws and carbon steel screws from three aspects of strength, corrosion resistance and application scenarios.
### Intensity comparison
First of all, from the point of view of the key indicator of strength, carbon steel screws usually show higher hardness and strength. Carbon steel is mainly composed of iron and carbon, through the heat treatment process, can significantly improve its hardness and tensile strength. The hardness of high-strength carbon steel long screws can often reach HRC30-35, or even higher, which makes them able to withstand greater torque and shear forces, especially suitable for high-load, high-stress heavy machinery and equipment. For example, in the installation process of key equipment such as steam turbines and generators, carbon steel screws are widely used because of their high strength characteristics to ensure the stability and safety of the equipment.
In contrast, the hardness of stainless steel screws is lower, generally between HRC18-24. Although this level of hardness is sufficient for most application scenarios, stainless steel screws may not be the best choice for applications where hardness is extremely high. However, stainless steel screws also perform well in mechanical properties, especially their tensile and shear resistance, which can meet the needs of most high-end equipment connections.
### Difference in corrosion resistance
In terms of corrosion resistance, stainless steel extension screws show unparalleled advantages. The reason why stainless steel has excellent corrosion resistance is mainly due to the chromium element contained inside. Chromium reacts with oxygen in the air to form 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 internal chromium will continue to react with oxygen and self-repair the protective layer, which makes the self-repair ability of stainless steel screws in a wet, corrosive environment can still maintain stable performance.
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. Therefore, in Marine engineering, chemical equipment, food processing and other areas that require a high degree of corrosion resistance, stainless steel screws have become the preferred fasteners. For example, in seawater treatment systems, stainless steel screws can resist the erosion of seawater for a long time to ensure the stable operation of the equipment.
In contrast, the corrosion resistance of carbon steel screws is weak. Although surface treatment such as electroplating and spraying can enhance its corrosion resistance, 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, carbon steel screws need additional anti-corrosion treatment or the selection of higher grade materials.
### Different application scenarios
There are also significant differences between stainless steel extension screws and carbon steel screws in application scenarios. Stainless steel screws are widely used in chemical industry, Marine engineering, food processing and other fields because of their excellent corrosion resistance and aesthetics. In the chemical industry, stainless steel screws can resist the erosion of various corrosive media to ensure the safe operation of equipment; In Marine engineering, stainless steel screws are the first choice for fasteners because of their excellent salt spray corrosion resistance. In the food processing industry, stainless steel screws are widely used in the installation and fastening of food processing equipment because of their good hygiene and corrosion resistance.
Carbon steel screws are widely used in construction, machinery manufacturing, automobile manufacturing and other industries because of their low cost and high strength. In the field of construction, carbon steel screws are commonly used in steel structure connection, bridge construction, etc. In the field of machinery manufacturing, carbon steel screws are used for fastening and installation of various mechanical equipment; In the field of automobile manufacturing, carbon steel screws are widely used for the connection of key components such as body and chassis because of their high strength and reliability.
In summary, there are significant differences between stainless steel extension screws and carbon steel screws in terms of strength, corrosion resistance and application scenarios. When selecting fasteners, comprehensive consideration should be made according to the specific application scenario, load requirements and environmental conditions to ensure the safety and reliability of the connection. With the progress of science and technology and the continuous innovation of materials, the performance and application range of these two fasteners will continue to expand and optimize in the future.
# Lengthening screws # Lengthening bolts # Lengthening outer hex screws # Lengthening inner hex screws # fasteners
