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Mar.29.2024 1USD=7.095RMB
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Brief introduction of stainless steel

https://en.steelhome.com [SteelHome] 2007-07-20 09:32:34

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"Stainless steel is essentially a low carbon steel which contains chromium at 10% or more by weight. It is this addition of chromium that gives the steel its unique stainless, corrosion resisting properties.
The chromium content of the steel allows the formation of a ... corrosion-resisting chromium oxide film on the steel surface. If damaged mechanically or chemically, this film is self-healing, providing that oxygen, even in very small amounts, is present. The corrosion resistance and other useful properties of the steel are enhanced by increased chromium content and the addition of other elements such as molybdenum, nickel and nitrogen. There are more than 60 grades of stainless steel....(it) is 100% recyclable"

For full cost effectiveness however, there are one or two other aspects to consider.

It costs several times more than carbon or mild steel, so appropriate design is proportionally more critical.

It is also worthwhile to select an appropriate grade. Highly corrosive conditions require specialised knowledge, but for general hygiene quality fabrication, the following guidelines apply-
304 (UNS S30400) Probably the most used grade of all the stainless steels. It is of the group classified as austenitic which are non-magnetic. If the thickness exceeds 3mm and it is to be welded, L grade (UNS S30403) is recommended, which has a carbon content less than 0.03%.

316 (UNS S31600) for improved corrosion resistance at temperatures less than 60o Centigrade (120o Fahrenheit) If the thickness exceeds 3mm and it is to be welded, L grade (UNS S31603) is recommended. It is also austenitic.

2205 (UNS S31803) for use in temperatures exceeding 60o Centigrade, where any free halides may be present, to resist stress corrosion cracking. Typically, this includes hot water. This 'duplex' grade is magnetic and approximately 15% stronger than the 'austenitic' grades (304 and 316) which can be a cost effective option when tension governs such as for pressure vessels, not subject to vacuum. It is significantly harder to form however. It work hardens rapidly, requiring any forming processes to be as near as possible to one pass. This is particularly applicable when forming compounded curve shapes such as knuckling and dome forming. Consequently, and depending on the ratio of the ends area to wall area of the tank the additional labour involved can be 10 to 15% more.
(Compiled by Steelhome.cn)
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