Does stainless steel rust?


Does stainless steel rust? A question we get

from many of our customers.

Stainless steel is also known as inox steel or inox from French inoxydable

(inoxidizable), is a steel alloy with a minimum of 10.5%[1] chromium

content by mass. Therefore stainless steel does not rust.



Stainless steel is widely popular for its anti-corrosion (anti-rust)

properties. Its used in manufacturing everyday life products. From

stainless steel jewelry, stainless steel watches, saucepans, sinks and even

aerodynamic parts.


Heart shape stainless steel earring Donny J China

316L stainless steel jewelry, heart shape earrings – Donny J China


Donny J China specializes in manufacturing stainless steel jewelry and

stainless steel watches. Mostly used stainless steel at our factory is 316L


Stainless steel does not readily corrode, rust or stain with water as

ordinary steel does.




Stainless steel watch case

Stainless steel watch case – Donny J China


Why does not stainless steel rust?

Stainless steel remains stainless, or does not rust, because of the

interaction between its alloying elements and the environment. Stainless

steel contains iron, chromium, manganese, silicon, carbon and, in many

cases, significant amounts of nickel and molybdenum. These elements react

with oxygen from water and air to form a very thin, stable film that consists

of such corrosion products as metal oxides and hydroxides. Chromium

plays a dominant role in reacting with oxygen to form this corrosion

product film. In fact, all stainless steels by definition contain at least 10

percent chromium.

What is Grade 316 stainless steel?

Grade 316 is the standard molybdenum-bearing grade, second in

importance to 304 amongst the austenitic stainless steels. The

molybdenum gives 316 better overall corrosion resistant properties than

Grade 304, particularly higher resistance to pitting and crevice corrosion in

chloride environments.



What you should know about steel metal as in general?

However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-

circulation environments. There are various grades and surface finishes of

stainless steel to suit the environment the alloy must endure.



In normal atmospheric or water based environments, stainless steel will

not corrode as demonstrated by domestic sink units, cutlery, saucepans

and work-surfaces.



In summary, stainless steel does not rust because it is sufficiently reactive

to protect itself from further attack by forming a passive corrosion product

layer. (Other important metals such as titanium and aluminum also rely on

passive film formation for their corrosion resistance.) Because of its

durability and aesthetic appeal, stainless steel is used in a wide variety of

products, ranging from stainless steel jewelry, eating utensils to bank

vaults and kitchen sinks.

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