Corrosion Resistance Of Various Stainless Steel

- Aug 30, 2018 -

                                  ——From Hongwang


Stainless Steel has strong corrosion resistance relatively. In addition to mechanical failure, the corrosion of stainless steel is mainly local corrosion, that is, stress corrosion cracking, pitting corrosion, intergranular corrosion, corrosion fatigue and crevice corrosion. In fact, we can avoid these failures through reasonable selection of materials.


Corrosion resistance of various stainless steel


1. 304: A versatile stainless steel, which is widely used in the manufacture of equipment and parts that require good overall performance (corrosion resistance and formability).


2. 301: Exhibiting a significant work hardening phenomenon when stainless steel is deformed, and is used in various occasions requiring higher strength.


3. 304L: A variant of 304 stainless steel with a lower carbon content for applications requiring soldering. The lower carbon content minimizes the precipitation of carbides in the heat affected zone near the weld, which may result in intergranular corrosion (weld erosion) in certain environments.


4. 309, 310: The nickel and chromium content of stainless steel are relatively high, in order to improve the oxidation resistance and creep strength of steel at high temperatures. The 30S5 and 310S are variants of the 309 and 310 stainless steels, except for the lower carbon content, in order to minimize the carbides precipitated near the weld.


5. 316: Type stainless steels contain aluminum and are therefore much more resistant to pitting corrosion in marine and chemical industrial environments than 304 stainless steel. Among them, the 316 stainless steel variant includes low carbon stainless steel 316L, nitrogen-containing high-strength stainless steel 316N and high-sulfur free-cutting stainless steel 316F.


6. 321 and 347 are stainless steel stabilized by titanium, niobium and tantalum, respectively, and are suitable for use as welded members at high temperatures.


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