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6.2 Material properties

The performance of the connection may deteriorate in service due to surface damage or fatigue failure. When selecting a suitable material, properties such as resistance to wear and good fatigue strength are desirable. Properties of some typical shaft materials are shown. Other material properties may be found in many sources, some of which are listed at the end of the Guide. The shear strength figures quoted should only be used in the absence of validated data. During calculation procedures a factor of safety should be employed and normally applied to the yield strength of the material. Notice that material strengths are often quoted as a single figure whereas in practice there is a tolerance or range of strengths for each different grade. In the absence of any other information the lower figure should be used.

STRENGTHS OF COMMON SHAFT MATERIALS

Material

BS 970

Specification

Tensile

Strength

(MPa)

Yield

Strength

(MPa)

Yield Shear

Strength

(MPa)

CARBON

STEEL

070M20

070M26

080M30

080M40

400/430

430/500

460/500

620/780

200/230

220/250

230/250

390/460

120/138

132/150

138/150

234/276

LOW ALLOY

STEEL

722M24

653M31

976M33

850/1080

770/1000

950/1050

650/760

590/680

770/820

390/456

354/408

462/492

STAINLESS

STEEL

410S21

420S37

431S29

304S15

540/700

770/930

850/1000

460

370

590

680

170

222

354

408

102