Of stainless steel product maintain usually note

Of stainless steel product maintain usually note

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 had a theme " .

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,

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.

Stainless steel finishing and product treatment are common 8 big questions:
1, welding line blemish: Welding line flaw is more serious, use processing technique of manual and mechanical burnish to make up for, the burnish trace of generation, create the appearance inhomogenous, the influence is beautiful.

2, the surface is abhorrent: Undertake pickling passivation to welding line only, also create the appearance inhomogenous, the influence is beautiful.

3, nick difficult eliminate: Integral pickling passivation, all sorts of nick take out that in will machining a process, also cannot arise, and also cannot purify because cut, solder splatter and conglutinate is in the carbolic steel of stainless steel surface, splatter wait for foreign matter, bring about the condition that corroding medium existence to allot biochemistry to learn to corrode or rust.

4, burnish polish passivation is inhomogenous: Handiwork undertakes pickling passivation is handled after burnish polish, greater work is accumulated on, effect of very inaccessible even and consistent processing, cannot get good even appearance. And man-hour charge, complementary makings cost is higher also.

5, pickling ability is limited: Pickling passivation creams is not all-purpose, be produced to plasma cut, blaze cut and black oxidation skin, more difficult eliminate.

6, the cut that causes for the element is more serious: In hoisting, carry and in structural treatment process, knock against, dilatory, hammer attacks the cut that waits for factitious element to cause more serious, make finishing difficulty is increased, and also be the main reason with the rustily generation after processing.

7, equipment element: Coil in profile, plank in the curved, process that fold a turn, the cut that cause and crease also are the main reason with the rustily generation after processing.

8, other factor: Stainless steel raw material is being purchased, store in the process, the clash that produces as a result of hoisting, carriage process and cut are more serious also, also be one of reasons with rustily generation.

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