2 Replies Latest reply on Jul 8, 2014 2:33 PM by Jerry Steiger

    Material Selection for Stainless 440c

    Mark Johnsen

      I am trying to find the deflection of a NSK PU15 linear rail using the simulation Add-in for Solidworks Premium.  I also want to find the deflection of the rail and my support beam, but that is the next step.  I want to see if the rail deflection by itself makes sense. 

       

      My problem is that I cannot find a material selection for the NSK PU15 linear rail, which is definitely a hardened 400 series Martensite stainless steel.  I found that other linear rails are Stainless Steel 440c, which I think that would be a fine choice as I don't know exactly the NSK material.  In the Steel material selection of Solidworks, there are a several 300 series Stainless steel selections, but no 400 series.  Not knowing what I don’t know, I would like a material selection w/ the (SS) designation for the stress-strain data because I ‘think’ that should help w/ the calculation to make it ‘better.’ 

       

      Any suggestions on choosing a 400 series stainless?  Someone else has had to have this problem?  Since it is not there, saving a material and modifying might be a good choie – any suggestions on that?  Also, would the DIN steels be a choice, but reading those numbers is hard?

       

        • Re: Material Selection for Stainless 440c
          Mark Johnsen

          I went to Matweb and looked up some properties and made my own Material for 440c Stainless.  I used AISI 440 Stainless Steel from the www.matweb.com. I have no idea if it's correct, but I did get different deflections w/ my data vs. annealed Stainless Steel. 

           

          See attached.

            440c Stainless Material.png

          I would have uploaded my 2 pdf's, but can't seem to upload a file here. 

           

          Also, my deflection w/ a beam 850mm and a 6N force on the end is 6.355mm for Mark's 440c Stainless and 6.905mm for 316 Annealed SS. 

            • Re: Material Selection for Stainless 440c
              Jerry Steiger

              Mark,

               

              I would have done the same.

               

              Your values for Elastic Modulus, Tensile Strength and Yield Strength seem wrong to me. My old Materials Engineering magazine has E=29,000,000 psi or 200,000 MPa, St=285,000 psi or 1966 MPa, and Sy=275,000 psi or 1897 MPa, assuming hardened and tempered. It also gives the coefficient of thermal expansion as 5.6E-6/F or 1.0E-5/K.

               

              Jerry S.

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