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Hi brett,

According to the CRC Handbook for Applied Engineering Science, the coefficient of friction (CF) for steel on steel can differ significantly from stainless on stainless and stainless on steel.  I'll quote a few data points for you below, and you can draw your own conclusions.  In all cases, the reported data is for dry-sliding surfaces in air (i.e. no surface lubricants).

CF         Materials
----       ----------------------
0.5    1020 steel on 1020 steel
0.4    440C stainless on 440C stainless
0.9    304 stainless on 304 stainless
0.8    Inconel on Inconel

1.47    302 stainless on 321 stainless
1.33    302 stainless on 347 stainless
1.03    302 stainless on 1085 steel
1.02    302 stainless on 302 stainless
0.90    302 stainless on 440C stainless
0.90    302 stainless on 4150 steel
0.88    302 stainless on 1060 steel
0.80    302 stainless on 1018 steel
0.71    302 stainless on 1045 steel

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