| Material | r g/cm3 |
Prod Cycle |
Endurance Limits - N/mm2; Ps = 50% | |||||
| Kt = 1 | Kt = 2.0 | |||||||
| R = 1 | R = -1 | R = 0 | R = -1 | |||||
| SAE 1015 | 7.87 | . | 190 | 210 | 140 | 155 | ||
| Nodular cast iron GH40-60 | 7.30 | . | 151 | 182 | 112 | 135 | ||
| Fe-0.45P | 6.8 7.1 |
SL SL |
86 135 |
100 153 |
70 84 |
86 100 |
||
| Fe-1.5Cu | 7.1 | SL | 123 | 144 | 90 | 105 | ||
| Fe - 1.5Cu Carbonitrided | 7.1 | SL + CN | 292 | 477 | 193 | 300 | ||
| Fe - 1.5Cu - 0.6C | 7.2 7.4 |
SL PS+R+SL |
127 146 |
160 198 |
102 115 |
137 97 |
||
| Fe-1.5Cu-0.6C hardened
and tempered |
7.1 | SL+H1 | 214 | 307 | 119 | 173 | ||
| Fe-2.0Cu-2.5Ni | 7.1 | SH1 | 117 | 146 | 105 | 124 | ||
| Fe-4.0Ni-1.5Cu-0.5Mo-0.6C | . | SH1 | . | 164 | . | 153 | ||
| Fe-0.8Mn-0.95Cr-0.24Mo-0.6C | 7.2 | SH2 | . | 298 | . | . | ||
| Fe-0.8Mn-0.95Cr-0.24Mo-0.6C hardened and tempered |
7.2 | SH2+H2 | . | 395 | . | . | ||
Key
Ps - Probability of survival. Safety margins for the design: divide by
1.6-2 the values given in the tables and compare with the maximum local
stress calculated for the part.
Kt = notch factor
R = õmin/õmax = ratio between minimum and maximum cyclic stresses
(R = 0, pulsating loading; r = -1, alternating loading)
SL = sintered at 1120°C for 30 min; SH1 = 1250°C for 30 min; SH2 = 1280°C
for 40 min
PS + R = pre=sintered at 750-800°C for 30 min and re-pressed
CN = carbonitrided at 920°C for 3.5h, quenched in oil at 60°C
H1 - austenitised at 840°C for 1h, quenched in oil at 60°C, tempered at
430°C for 1h
H2 = austenitised at 900°C for 30 min, quenched in oil at 60°C, tempered
at 300°C for 1h
Data source: C M Sonsino; private communication, published in 'Guide to
Design of Sintered Parts' and reprinted with permission of Assinter, Italy