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316 Stainless Steel Pipe are really Stainless?

Shannxi Shew-E Steel Pipe Co.,Ltd | Updated: Apr 17, 2017

316 Stainless steel pipe are really stainless?

Stainless steel pipe has the ability of resistance to atmospheric oxidation, namely, stainless ;also has the ability of corrosion resistance in the medium containing acid, alkali, salt corrosion -  corrosion resistance.

But the ability of its corrosion resistance change with the chemical composition of steel itself, using conditions and environmental medium type.

As 304 steel pipe(GB06Cr19Ni10;BSEN 1.4301),have absolute good corrosion resistance in dry, clean atmosphere, but applied in the coastal areas, containing a great deal of sea salt fog, will soon rust;but 316 steel pipe (GB06Cr17Ni12Mo2;BSEN 1.4401)do well.So, not any kind of stainless steel pipe are stainless and corrosion in any environment.

Technically, 316 pipe shouldn't rust.For highly oxidized acids (such as nitric acid), 316 stainless steel pipe is less corrosive.

Main show is:

1)Intergranular corrosion

Exposed to 427 ° C to 427 ° C temperature, 316 may cause chromium carbide in grain boundary precipitates, easy to produce intergranular corrosion in this harsh environment

2)Stress corrosion

In the halogenized environment, austenitic stainless steel is susceptible to stress corrosion cracking.Although 316 has some of the better stress corrosion cracking, it is easier to be affected.

In order to protect 316 from rusting,we suggest that :

1)The surface layer of impurities must be heavily ground off, with a polishing/buffing wheel and paste, using a series of new polishing wheel covers and repeated washdowns, returning a high polish to the surface.

2)Light oils/wd40 etc will protect the general surface

3)Grade 304 stainless steel is recommended for inland areas and Grade 316 stainless steel pipe or titanium is recommended for coastal areas or other highly corrosive

because 316 materials can resist corrosion in seawater.

4)Choose a reliable manufacturer, that the chemical composition conforms to both  national and international standards. SHEW-E STEEL PIPEis a company specializes in exporting stainless steel pipe such as 304.304l,316,316l and ect.we also can provide customers with products based on their specified technical requirements.please Email to :info@shew-esteelpipe.com to learn more!


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