不锈钢螺栓和铁螺栓的区别,哪个更好

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Stainless steel screws and iron screws, can not say which is better, mainly depends on the use of occasions.

In terms of corrosion resistance, stainless steel screws are obviously better than iron screws. Because the corrosion protection of stainless steel is based on the inside of the chromium, it reacts with the oxygen in the air to form a protective layer of chromium oxide, which protects the stainless steel screws from corrosion; if the chromium oxide protective layer is destroyed due to impact or the like, the chromium inside will automatically Reacts with oxygen in the air and continues to generate chrome oxide protection screws.

Iron screws, although black, electroplating and other surface treatment methods, anti-corrosion performance is good; but once the surface coating is destroyed, because there is no ability to automatically regenerate the protective layer, it will quickly rust.

In terms of mechanical properties, the strength grade of stainless steel is generally equivalent to 8.8 grade of carbon steel, generally slightly lower than 8.8, A2-80 or A4-80 is higher than 8.8, but it is relatively rare, because processing is more difficult. Although carbon steel is relatively soft, it can only be made directly to 4.8, 5.8 and 6.8; however, carbon steel can be heat treated, so the strength grade can reach 8.8, 10.9, 12.9 or even 14.99. It can meet more demanding requirements such as tensile, twisting and toughness, and has wider application.

In particular, the continuous development of new alloy steel materials, used in the field of fasteners, has made great progress in terms of product requirements such as better corrosion protection, lighter weight, smaller size and longer life. The relative development of stainless steel is relatively slow. In addition to strain hardening (increased hardness and strength, but limited effect), solid solution treatment (increased toughness and corrosion resistance, and reduced magnetic properties), others have not heard any breakthrough progress. On the contrary, the price is too expensive (the raw materials are too expensive, and the processing is more difficult than carbon steel). Where stainless steel is used, it is being replaced by a large number of carbon steel screws (the surface treatment technology of carbon steel screws is developing very rapidly).

xxOf course, these two types of screws will still be used in a large number of different occasions. After all, there are many places that cannot be replaced. In general, from a safety point of view, carbon steel screws of class 8.8 and below can be basically replaced by stainless steel screws; but only if you have enough strength, expensive products can be accepted by the market.

Stainless steel screws and iron screws, can not say which is better, mainly depends on the use of occasions.

In terms of corrosion resistance, stainless steel screws are obviously better than iron screws. Because the corrosion protection of stainless steel is based on the inside of the chromium, it reacts with the oxygen in the air to form a protective layer of chromium oxide, which protects the stainless steel screws from corrosion; if the chromium oxide protective layer is destroyed due to impact or the like, the chromium inside will automatically Reacts with oxygen in the air and continues to generate chrome oxide protection screws.

Iron screws, although black, electroplating and other surface treatment methods, anti-corrosion performance is good; but once the surface coating is destroyed, because there is no ability to automatically regenerate the protective layer, it will quickly rust.

In terms of mechanical properties, the strength grade of stainless steel is generally equivalent to 8.8 grade of carbon steel, generally slightly lower than 8.8, A2-80 or A4-80 is higher than 8.8, but it is relatively rare, because processing is more difficult. Although carbon steel is relatively soft, it can only be made directly to 4.8, 5.8 and 6.8; however, carbon steel can be heat treated, so the strength grade can reach 8.8, 10.9, 12.9 or even 14.99. It can meet more demanding requirements such as tensile, twisting and toughness, and has wider application.

Of course, these two types of screws will still be used in a large number of different occasions. After all, there are many places that cannot be replaced. In general, from a safety point of view, carbon steel screws of class 8.8 and below can be basically replaced by stainless steel screws; but only if you have enough strength, expensive products can be accepted by the market.

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