Friday, 10 February 2012

What is the difference between SS304 and SS316

                          
Both SS304 and SS316 are austenitic stainless steels.
         CHEMICAL COMPOSITION OF SS304 AND SS316               

              C       Mn       P         S        Si           Cr              Ni             Mo
        
SS304  0.08    2.0    0.045   0.03    1.0    18.0-20.0     8.0-10.0        -

SS316  0.08    2.0    0.045   0.03    1.0    16.0-18.0    10.0-14.0    2.0-3.0 

 From the above chemical composition chart we can see the main difference between SS304 and SS316 is that SS316 contains 2%-3% molybdenum and SS304 has no molybdenum.Now the question arises that we are paying double money for SS316 only for that 2.5% 'Moly'.The answer is yes, because this  "molybdenum" is added to improve the corrosion resistance to chlorides (like sea water).That is why in coastal area plants SS316 is used.

Why addition of molybdenum improves resistance against chloride corrosion?
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15 comments:

  1. sara 61906 August 2013 at 15:25

    How would you identify the difference by seeing them physically ?

    ReplyDelete
    Replies
    1. Unknown23 September 2013 at 07:12

      I don't think you can. They look almost the same. The only way you can identify the difference is by using the XRF Analyzer

      Delete
    2. rhoy30 August 2014 at 13:12

      you can test it by just sticking a Hard drive Magnet, the SS304 magnet will stick while SS316 magnet will slide down.

      Delete
    3. Anonymous10 March 2015 at 14:48

      the difference between 2 can be identified by using molybdenum test kit....... put a drop of kit solution on surface of steel.. now put the negative terminal of a 9volt battery on steel surface n positive terminal on that droplet... if droplet turns to pink that means it is ss316. if it turns black than ss302 and if green than ss304.

      Delete
    4. Yash Kapta13 September 2015 at 19:41

      Thanks a lot. I have been looking for this answer for quite a good time.

      Delete
    5. Unknown23 October 2015 at 14:51

      you can use electrolyte solution & 9 v battery to identify grades between SS 304 & SS 316
      SS316 :-Appears red in colour
      SS304:- Appears red colour but in 2 sec. its being colourless

      Delete
  2. Shailesh8 February 2014 at 12:14

    Thanks for such valuable information.

    ReplyDelete
  3. Unknown24 March 2014 at 12:39

    Friends ,
    Can any body give an idea about maximum machining(turning , milling & grinding) finish can be achieved on ss304 and ss316 - very urgent- help

    ReplyDelete
  4. Anonymous14 May 2014 at 12:20

    Hello,

    Does anybody know if SS316 is suitable to be used with NH3 liquid cargoes in marine applications or due to corrosion issues we need to use a more robust type of steel?

    Many thanks!

    ReplyDelete
    Replies
    1. Anonymous10 March 2015 at 14:50

      ss316 can withstand with nh3. even nh3 is used for cleaning of ss316

      Delete
  5. Unknown24 May 2014 at 16:56

    in ss304, 304 stands for what??

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  6. SPARMAR28 May 2014 at 17:44

    Mechanical Properties very urgent ss304 halp.

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  7. Unknown29 August 2014 at 16:05

    We want to manufacture Front fork links for scooters . Currently , these are made from forged iron and heat treated ? Can we do them from SS 316 ? Strength is a major concern as this is a safety item .

    ReplyDelete
  8. Unknown31 July 2015 at 19:50

    Hi,
    There is more difference between stainless steel 304 & stainless steel 316.

    We are leading stainless steel wire India manufacturers, deals into wires like MIG Wire & TIG Wire.

    ReplyDelete
  9. pharma engineering18 March 2016 at 09:42

    exactly, molybdenum is very high resistant towards corrosion

    ReplyDelete

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