Category: Frictional Properties
Mechanical & Physical Properties
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Coefficients of friction are more dependent on surface rather than material properties. Surface finish, cleanliness and lubrication of the mating surfaces largely determine the actual frictional resistance between mating surfaces. Surface finish, mating tolerances and lubrication play an important role in preventing galling and seizure.
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Guidance on methods for sorting stainless steels from low alloy and carbon steels is shown. These include physical, (colour, density, magnetic), and mechanical, (hardness), properties and chemical tests, (copper sulphate, copper chloride, nitric acid and sulphur tests). A suggested approach to a step-by-step procedure for differentiating stainless steels from carbon steels is tabulated. These methods have not been verified by the BSSA, who take no responsibility for their accuracy of the conclusions reached on steel types.
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Stainless steels cannot be regarded as ‘spark free’ where there could be a risk of gas ignition by frictional contact. Although the corrosion resistance of stainless steels is better then plain carbon, (mild steel), their frictional sparking characteristics and their explosive gas ignition risk is no better. This based on work done by the Health and Safety Laboratory of the Health and Safety Executive at Buxton, UK, in 1995.
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