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Why Stainless Steel Heating Element Tubular Heater Pipe Rust?
Mar 20, 2018

Why stainless steel heating element tubular heater pipe rust?

Under normal circumstances, the stainless steel 304 heating element pipe will not rust, but do not rule out the possibility of rust, and some customers will be the first reaction is suspected of our heating pipe stainless steel material, this is understandable , Today we simply tell you that the general will rarely appear stainless steel heating pipe rust phenomenon.

Stainless steel in general is not rusty, but exposure to chlorine or harsh environment, especially when the surface of the passivation layer by mechanical or chemical damage, it is easier than usual rust, so in this environment It is easier to rust. We usually use the surface of stainless steel products are passivated, and its surface oxide film thickness of chromium oxide than the natural surface of the formation of thick, more closely. So, stainless steel electric tube is rusty, ah!

Next for everyone extension of some stainless steel material description:

All metal in the atmosphere will be in the atmosphere with oxygen oxidation reaction, the formation of oxide film on the surface. However, in the formation of ordinary carbon steel oxide will continue to oxidation, so that corrosion continues to expand, and ultimately the formation of holes. The surface of the carbon steel can be protected by plating with a paint or an oxidation resistant metal (e.g., zinc, nickel and chromium), but, as is well known, this protection is only a thin film. If the protective layer is damaged, the following steel will begin to rust chromium is stainless steel to obtain the basic elements of corrosion resistance, when the chromium content of steel to about 12%, chromium and corrosive media in the role of oxygen in the steel surface to form a A very thin layer of oxide film (from the passivation film), can prevent further corrosion of the steel substrate. In addition to chromium, the commonly used alloying elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the various uses of stainless steel on the organization and performance requirements.

Chemical composition: The corrosion resistance of stainless steel decreases with the increase of carbon content, so most of the carbon content of stainless steel is low, some of the carbon content of steel and even less than 0.03% (such as 00Cr12). Stainless steel in the main alloying element is chromium, when the chromium content reaches a certain amount of stainless steel will have corrosion resistance. Therefore, the general chromium content of stainless steel are more than 13%. Stainless steel also contains Ni, Ti, Mn, N, Nb and other elements.

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