Knowledge Q & A
Zhejiang Zhengkang Industrial Co., Ltd.

Knowledge Q & A

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What are the main thin-walled stainless steel pipes?

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What are the main materials of thin-walled stainless steel pipes? Stainless steel has developed to more than 100 grades, and L represents ultra-low carbon. 304 carbon content is less than 0.08, 304L carbon content is less than 0.03, argon protection is not good, carbon and chromium will form carbon chromium compounds, thus forming chromium oxide (Cr2O3) content is relatively reduced, weld corrosion resistance decreased. The lower the carbon content, the less carbon chromium compounds formed in the weld, and the better the corrosion resistance of the weld.
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Why is stainless steel resistant to corrosion?

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Stainless steel corrosion resistance is because the surface has a layer of chromium-rich oxide film (Cr2O3), on the contrary, if the passivation film is destroyed, stainless steel will lose corrosion resistance. The passivation film is thin and dense, which can reflect the true color of the metal.
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What is stainless steel?

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What is stainless steel? Stainless steel is steel that is not easy to rust. The reason why stainless steel does not produce rust is that it can produce an invisible but very dense chromium rust, that is, the oxide film of chromium, which isolates the metal in the steel from the outside air, water, acid, etc. without oxidation reaction (that is, rust); Stainless steel is an alloy steel, and the composition of various elements in it directly determines the corrosion resistance of stainless steel, in particular, nickel elements and chromium elements. Stainless steel is often divided into: martensitic steel, ferritic steel, austenitic steel, etc., thin-walled stainless steel pipes are generally made of austenitic steel as raw materials.
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Whether it is stainless steel pipe or crimped zinc-plastic carbon steel pipe, it is more expensive than traditional materials?

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The cost of installation and use of stainless steel piping systems includes not only the cost of product procurement, but also the cost of installation and maintenance, as well as the cycle cost of replacing the piping system during the life cycle of the main building. Compared with traditional products, stainless steel pipes and crimped zinc-plastic carbon steel pipes have the characteristics of corrosion resistance, long life, and maintenance-free, which reduces maintenance and cycle costs, and has low comprehensive costs. It is a once-and-for-all choice.
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What are the principles and advantages of crimping?

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The crimping type is a connection mode in which the pipe is inserted into the socket of the pipe fitting containing the O-ring seal, and the socket is pressed with a special crimping tool. It has the characteristics of excellent sealing performance, simple and convenient installation (a joint can be installed in only 5-7 seconds) and strong pull-out resistance.
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What are the disadvantages of traditional galvanized pipes in the field of gas and fire protection?

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①Easy to corrode, short service life, and during use, anti-corrosion paint needs to be applied to the outer wall every 2-3 years, and the maintenance cost is high ② Galvanized pipes are generally connected by threaded reaming, which takes a long time to install, is difficult, and the amount of auxiliary materials to install is large, and the threaded connection is a live connection, so there is a risk of stealing the pipeline.