304 stainless steel will rust after welding?
Release time:
2023-10-10
【Summary Description】 In addition to iron, the composition of 304 stainless steel includes chromium, nickel, aluminum, silicon, etc. Scientists have found that the more uniform the internal structure of the steel, the more closely the various components are linked, the more difficult it is for corrosion to invade, and the content of alloying elements, generally speaking, the content of chromium in 10.5% steel is not easy to rust. The higher the content of chromium nickel, the better the corrosion resistance. For example, the content of nickel in 304 materials is 8-10%, and the content of chromium reaches 18-20%. Such 304 stainless steel will not rust after welding. In addition, a layer of oxide protective film is attached to the surface, just like putting armor on steel, it is naturally not easy to rust. Stainless steel is formed on the surface of a very thin and strong fine stable chromium-rich oxide film (protective film), to prevent oxygen atoms continue to penetrate, continue to oxidize, and obtain the ability to resist corrosion. But there is some reason, this film is constantly destroyed, the air or liquid and oxygen atoms will continue to penetrate or metal iron atoms continue to segregate out, the formation of loose iron oxide, the metal surface is also subject to constant corrosion. There are many forms of damage to this surface film, and the most common ones are as follows: 1, stainless steel surface storage containing other metal elements of dust or heterogeneous metal particles of the attachment, in the humid air, the attachment and stainless steel between the condensate, the two into a micro battery, triggered the electrochemical reaction, the protective film is damaged, called electrochemical corrosion. 2, stainless steel surface adhesion of organic juice (such as melons and vegetables, noodle soup phlegm, etc.), in the case of water and oxygen, constitute organic acid, long time to form organic acid on the metal surface corrosion. 3, stainless steel surface adhesion containing acid, alkali, salt substances (such as the decoration of the wall of alkaline water, lime water spray) caused by local corrosion. The welding process of stainless steel welding manufacturers will also affect the corrosion resistance of stainless steel. Stainless steel processing plants with good welding technology, advanced equipment and advanced technology can be guaranteed in the control of alloy elements, the removal of impurities and the control of billet cooling temperature. Welding stainless steel products has rich experience and advanced equipment, while some small steel mills have backward equipment and backward technology. In the smelting process, impurities cannot be removed, and the products produced will inevitably rust. Therefore, from the material itself, 304 stainless steel will not rust, but because it needs to be processed, whether it will rust or not depends on the smelting technology of the processing plant. Try to choose a large processing plant with advanced equipment and good welding technology.
In addition to iron, the composition of 304 stainless steel includes chromium, nickel, aluminum, silicon, etc. Scientists have found that the more uniform the internal structure of the steel, the more closely the various components are linked, the more difficult it is for corrosion to invade, and the content of alloying elements, generally speaking, the content of chromium in 10.5% steel is not easy to rust. The higher the content of chromium nickel, the better the corrosion resistance. For example, the content of nickel in 304 materials is 8-10%, and the content of chromium reaches 18-20%. Such 304 stainless steel will not rust after welding.
In addition, a layer of oxide protective film is attached to the surface, just like putting armor on steel, it is naturally not easy to rust. Stainless steel is formed on the surface of a very thin and strong fine stable chromium-rich oxide film (protective film), to prevent oxygen atoms continue to penetrate, continue to oxidize, and obtain the ability to resist corrosion. But there is some reason, this film is constantly destroyed, the air or liquid and oxygen atoms will continue to penetrate or metal iron atoms continue to segregate out, the formation of loose iron oxide, the metal surface is also subject to constant corrosion. There are many forms of damage to this surface film, and the most common ones are as follows:
1, stainless steel surface storage containing other metal elements of dust or heterogeneous metal particles of the attachment, in the humid air, the attachment and stainless steel between the condensate, the two into a micro battery, triggered the electrochemical reaction, the protective film is damaged, called electrochemical corrosion.
2, stainless steel surface adhesion of organic juice (such as melons and vegetables, noodle soup phlegm, etc.), in the case of water and oxygen, constitute organic acid, long time to form organic acid on the metal surface corrosion.
3, stainless steel surface adhesion containing acid, alkali, salt substances (such as the decoration of the wall of alkaline water, lime water spray) caused by local corrosion.
The welding process of stainless steel welding manufacturers will also affect the corrosion resistance of stainless steel. Stainless steel processing plants with good welding technology, advanced equipment and advanced technology can be guaranteed in the control of alloy elements, the removal of impurities and the control of billet cooling temperature. Welding stainless steel products has rich experience and advanced equipment, while some small steel mills have backward equipment and backward technology. In the smelting process, impurities cannot be removed, and the products produced will inevitably rust.
Therefore, from the material itself, 304 stainless steel will not rust, but because it needs to be processed, whether it will rust or not depends on the smelting technology of the processing plant. Try to choose a large processing plant with advanced equipment and good welding technology.
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