At present, stainless steel plate and galvanized steel plate are common materials for kitchen smoke exhaust pipes. Galvanized steel plate is achieved by coating a layer of metal zinc on the surface of the steel plate to prevent rust. Due to the more active chemical properties of metallic zinc compared to iron, zinc often oxidizes before iron, thus protecting the iron layer from damage. Stainless steel, on the other hand, is an alloy treated steel with chromium, forming an extremely thin, sturdy, and dense stable chromium rich oxide film on its surface. This tightly adhered chromium rich oxide protects the surface, effectively preventing oxygen atoms from continuing to penetrate and oxidize, thereby obtaining rust resistance. It should be said that both have good rust resistance.
However, in contrast, Qingfeng Xia recommends choosing stainless steel plate materials, so why is this? This starts with the composition of oil fumes. The composition of lampblack is very complex and is related to multiple factors such as the type of fuel, the type of edible oil, ingredients, cooking time, cooking temperature, and cooking method.
据了解，不同种类的食用油在高温下的热解产物多达 200 多种，其中主要有碳氢化合物、醛类、酮类、醇类、烃类、脂肪酸、芳香族化合物以及杂环化合物等。这里面的部分产物会与水相结合形成亚硝酸、硝酸、碳酸等具备腐蚀性的物质，它们在经过排烟管道的时候势必会对管道造成侵蚀。因此排烟管道的材质除了防锈以外，还应该具备一定的耐弱酸能力。
It is understood that there are over 200 pyrolysis products of different types of edible oils at high temperatures, mainly including hydrocarbons, aldehydes, ketones, alcohols, hydrocarbons, fatty acids, aromatic compounds, and heterocyclic compounds. Some of the products inside will combine with water to form corrosive substances such as nitrite, nitric acid, and carbonic acid, which are bound to cause corrosion to the smoke exhaust pipeline when passing through it. Therefore, in addition to rust prevention, the material of smoke exhaust pipes should also have a certain degree of weak acid resistance.
And stainless steel is stronger in this regard than galvanized steel plate. We take the 304 universal model stainless steel, which is 18/8 stainless steel, as an example. Its standard composition is 18% chromium and 8% nickel. It is reported that the annual corrosion rate of this type of steel in the air is generally less than 0.01mm. Even in environments with high kitchen fumes, its annual corrosion rate is often less than 0.02mm, indicating its corrosion resistance. In addition, stainless steel plates also have good insulation and heat resistance properties.
Now, do you know what material should be used for the kitchen exhaust duct? Overall, both galvanized steel plate and stainless steel plate are capable of this job, but there are still some differences in price and performance characteristics between the two. If you want low cost, you can choose galvanized steel plate. If you want good material, you are more recommended to choose stainless steel plate.
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