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.
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.
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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.