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Stainless Steel to Stainless Steel Friction Factors

Stainless Steel to Stainless Steel Friction Factors

Stainless Steel to Stainless Steel Friction Factors

(OP)
Hi All,
         I am looking for a reference for Coefficients of Friction for the case of Stainless Steel to Stainless Steel (in the dry, unlubricated condition) Type 304. I know there are plenty of references for steel to steel but I need SS/SS. Anyone know of such a reference where values are given?

RE: Stainless Steel to Stainless Steel Friction Factors

No 304/304, but some limited data:

Extract from page 33 of Nitronic 60 brochure by High Performanced Alloys, see website  www.hpalloy.com .

Adobe Acrobat text copy:

Table 54
Dynamic Coefficient of Friction
                    Test Stress Level, N/mm2
                5.6     14.0    28.0    56.0    112.0
Alloy           -------------------------------------
NITRONIC 60     .35     .38     .44
Stellite 66     .60     .63     —
NITRONIC 32             .45     .53     .65     .58

*Tested in water at 20°C, self-mated.

Table 55
Dynamic Coefficient of Friction
Ring on Block (15-45Ibs [67-200 N])*
Ring            Block             Coefficient of Friction
Type 440C       NITRONIC 60            0.4 in Argon
                                       0.4 in Air
Type 440C       Type 304               0.4 in Air
Type 440C       Type 316               0.5 in Air


*Taken from: "Friction, Wear, and Microstructure of Unfubricated
Austenitic Stainless Steel," by K. L. Hsu, T. M. Ahn, and D. A. Rigm
Ohio State University. ASME Wear of Materials-1979.


However, 304 on 304 will gall at low stress (maybe a couple of ksi according to Armco). This will massively increase "friction" forces.

RE: Stainless Steel to Stainless Steel Friction Factors

I have always used 3ksi as a galling limit for 304 or 316.  At that point you are trying to weld the parts together.
Self mating is a poor practice, in stainless it is a disaster.
At the low loads that are possible with stainless the friction factors will not vary a lot based on material.  Values in the range of 0.4-0.5 will almost always fit.

= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net

RE: Stainless Steel to Stainless Steel Friction Factors

From Carpenter Stainless Steels, page 329:
Threshold Galling Stresses, self mated, unlubricated ground finish
Annealed 304 (their Project 70):    8.0 ksi [55 MPa]
Cold drawn 304 (their Project 70): 2.5 ksi [17 MPa]

RE: Stainless Steel to Stainless Steel Friction Factors

(OP)
All,
     Thanks very much for the responses. The responses were what I expected especially about the galling problem. The situation is that we have stainless steel pipe shoes which sit on stainless steel support steel. I am concerned about the friction/stiction between the "like" materials. Any further thoughts?

RE: Stainless Steel to Stainless Steel Friction Factors

What temperature?  Hotter is worse.
Are these exposed to weather?

= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net

RE: Stainless Steel to Stainless Steel Friction Factors

(OP)
Hi EdStainless,
                The temperature is around ambient (20 Deg C) and they are not subject to weather.

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