I need to determine the minimum wall thickness for 1018 CRS for a knife blade. I know the moment, max deflection, greatest safe load, yield strength, MOE, length, density, current wall thickness, etc. However, I can not find a general formula connecting yield strength to wall thickness, which is, I think, what I need. Any help in finding a formula so that I can determine the minimum wall thickness with the info. above is greatly appreciated. Thank you.