Teach you how to choose with maintain the fittings of hardware stainless steel of your home! !

Have fine much client product of amazed stainless steel rusted unexpectedly! Also fine much manufacturer does not understand how to explain! So below, letPlant of technology of Dong Zhuo metalsFor your popular science!


Why does stainless steel also rust?
When stainless steel tubal surface extensive has Brown rusty spot (dot) when, surprised and bewildered of people big move: Think “ stainless steel is rustless, rusting is not stainless steel, the likelihood is steel qualitative extensive removed thematic ” . Honest, this is a kind of when lack understanding to stainless steel one-sided wrong view. Stainless steel also can rust below certain premise.

Stainless steel has the capacity that keeps out atmosphere oxidation---Do not become rusty namely quality, also have the capacity that erodes therefore in the medium that containing acerbity, alkaline, salt at the same time---Be able to bear or endure namely corrode sex. But its fight the size that erodes ability is chemistry of therewith steel qualitative itself the composition, condition that add each other, use premise reachs environmental medium kind and change. Be like 304 steel tube, in the air of dry cleanness, have fight rustily ability admirably absolutely, but move it littoral area, in the sea fog that contains many salt portion, can rust very quickly; And 316 steel tube are behaved good. Accordingly, not be a kind of any stainless steel, fall in any environments ability is eroded, rustless.

Stainless steel is to rely on its surface to form a paper-thin and solid close not random Fu Ge oxidizes film (defend film) , prevent oxygen atomic to accede permeate, successive oxidation, and obtain fight rustily ability. Once have some kind of reason, this kind of film sufferred be destroyed ceaselessly, atom of the oxygen in air or liquid can be permeated ceaselessly or the iron in the metal is atomic ceaselessly analyse leaves come out, form inattentive ferric oxide, metallic surface also gets ceaselessly rustily. The formal fine that film of this kind of surface is destroyed is much, paper what see more in the mouth to have a few kinds as follows daily:
1. Stainless steel surface retains the attachment that accumulating the dust that contains other tantalum or alien metal grain, in humid air, the condenser water between attachment and stainless steel, become both a small cell repeatedly, caused electrochemistry reaction, diaphragm is destroyed, say call electrochemistry is eroded.
2. Conglutinate of stainless steel surface has machine content juice (the dish that be like melon, water in which noodles have been boiled, phlegmy etc) , below circumstance of oxygen having water, make organic acid, long an organic acid is right of metallic surface erode.
3. Conglutinate of stainless steel surface contains acerbity, alkaline, salt kind material (if decorate splash of the buck of wall, limewater) , cause local erode.
4. In the air that has pollution (if contain the air of nitrogen of carbon of a large number of sulfide, oxidation, oxidation) , treat condenser water, form place of fluid of vitriolic, nitric acid, acetic acid, cause chemistry to erode.
Above circumstance all can cause stainless steel surface to defend velar destruction is caused rustily. So, to ensure metallic surface is permanent and shining, not by rustily, we suggest:
1. Indispensible often undertake to decorating stainless steel surface cleanness is swabbed, purify attachment, eliminate cause rustily outside element.
2. Littoral area should use 316 material qualitative stainless steel, 316 material can keep out seawater to erode character.
3. Some stainless steel are in charge of chemical composition to cannot accord with corresponding nation measure on the market, short of 304 material ask character. Because this also can be caused,rust, this chooses to have the product of credit manufacturer really with respect to need user.
Why can stainless steel also take magnetism?

People constant with magnet adsorption stainless steel material, test and verify its actor bad and true bogus, do not suck without magnetism, thinking is good, all wool and a yard wide; The person that suck has magnetism, thinking is pinchbeck counterfeit. Honest, this is a kind extremely one-sided, crackpot discerns wrongly method.
The sort of stainless steel is various, can divide by constituent structure below normal temperature it is a few kinds:
1. Austenite: Be like 304, 321, 316, 310 etc;
2. Martensite or ferrite: Be like 430, 420, 410 etc;
Austenite it is not to have magnetism or weak magnetism, martensite or ferrite are magnetic.
Using the stainless steel majority that makes adornment tube plate normally is austenite model 304 material are qualitative, will tell commonly do not have magnetism or weak magnetism, but because smelt causes chemistry to composition fluctuates or machine condition to differ to float possibly also,remove magnetism, but it is pinchbeck that this cannot think or difference case, what reason is this?
Austenite is being mentioned above is not to have magnetism or weak magnetism, and martensite or ferrite take magnetism, because the composition when smelt slants analyse or heat treatment are undeserved, can cause austenite a few martensite in 304 stainless steel or ferrite organization. Such, faint magnetism can be contained in 304 stainless steel.
Additional, cold working of by of 304 stainless steel, organize a structure to also can be changed to martensite, cold working is out of shape degree bigger, martensite is changed more, the magnetism of steel is bigger also. If unite the metal strip of lot number, produce Φ76 canal, without remarkable magnetism feeling, produce Φ9.5 canal. Because Ling turn is out of shape bigger magnetism feels a few more remarkable, produce square rectangular canal because deflection is bigger than round canal, especially knuckle branch, be out of shape more intense magnetism is more remarkable.
Want to eliminate the magnetism of the 304 steel that afore-mentioned reasons cause completely, can be in sleave to restore not random austenite to organize through tall Wen Gurong, thereby expunction is magnetic.
What should put forward particularly is, because of above the magnetism of the 304 stainless steel that the reason causes, with the stainless steel with other qualitative material, be like 430, the magnetism of carbolic steel is not unified level completely, that is to say what the magnetism of 304 steel shows from beginning to end is weak magnetism. 　
This tells us, if stainless steel belt loses not to take magnetism magnetic or completely, should differentiate is 304 or 316 material are qualitative; If the magnetism with carbolic steel is same, show ferromagnetic, because differentiate is,not be 304 material pledge.


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