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  • Valve Trim Material

    by
    hakr5
    Published on 07-01-2010 11:26 AM
    2 Comments Comments
    Dear All

    Recently I come across an issue related to valve trim material:

    As per our approved Valve Material Specification the trim material should be 11-13% Cr steel. But as per the manufacturer data sheet the trim material is ASTM A105 + Stellite. Do this material comply with 11-13% Cr requirement? Also can anyone provide any data sheet regarding this.Please help.....

    Regards

    HARIKRISHNAN
    This article was originally published in forum thread: Valve Trim Material started by hakr5 View original post
    Comments 2 Comments
    1. Rahul1127's Avatar
      Rahul1127 - 07-01-2010, 02:31 PM
      Dear Hari,

      11-13% Cr steel & ASTM A105 + Stellite are not same 11-13% Cr steel trim is SS where as ASTM A105 + Stellite is CS , so SS is better than CS. I hope this will clear your doubt.

      Regards
      Rahul
    1. ashfaqanwer's Avatar
      ashfaqanwer - 07-02-2010, 06:18 PM
      Stellite valve trim is very commonly used to resist wear as it is very hard containing chromium, cobalt, tungsten, molybdenum. Principally stellite is an alloy of cobalt and chromium in which Cr is above 25% normally.

      What I think is stellite valve trim is better than 11-13% Cr material (normal F6 as hard F6 would be more harder due to nitriding) if stelliting has been done properly by the manufacturer. And I am saying this on the basis of hardness as normal Stellite 6 has a hardness of 350 HB as compared to F6 having 250 HB (without case hardening / nitriding).

      You may confirm it from the supplier also regarding long term applications with stelliting on CS.

      Regards,
      Ashfaq Anwer

      [link Point to another website Only the registered members can access]

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