Mechanical properties of gray cast iron
The cooling rate during solidification and during the following phase transformations has a significant influence on the material’s strength as well as on its hardness. The values, given in the table below, refer to separately cast samples with a diameter of 30mm.
Mechanical properties of separately cast samples (30 mm diameter)
|
Mechanical properties |
Material No. |
||||
|
HT-150 |
HT-200 |
HT-250 |
HT-300 |
HT-350 |
|
|
Microstructure |
ferr./pearl |
pearlitic |
|||
|
Tensile strength Rm/Mpa |
150-250 |
200-300 |
250-350 |
300-400 |
350-450 |
|
Proof stress Rp0.1/MPa |
98-165 |
130-195 |
165-228 |
195-260 |
228-285 |
|
Elongation at fracture A/% |
0.3-0.8 |
0.3-0.8 |
0.3-0.8 |
0.3-0.8 |
0.3-0.8 |
|
Compression strength δdb /MPa |
600 |
720 |
840 |
960 |
1080 |
|
Compression yield point δd0.1/MPa |
195 |
260 |
325 |
390 |
455 |
|
Bending strength δdB/MPa |
250 |
290 |
340 |
390 |
490 |
|
Shear strength δaB/MPa |
170 |
230 |
290 |
345 |
400 |
|
Torsional strength TtB/MPa |
170 |
230 |
290 |
345 |
400 |
|
Modulus of Elasticity E/(k MPa) |
78-103 |
88-113 |
103-118 |
108-137 |
123-143 |
|
Poisson ratio μ |
0.26 |
0.26 |
0.26 |
0.26 |
0.26 |
|
Bending fatigue strength δbW/MPa |
70 |
90 |
120 |
140 |
145 |
|
Fatigue limit under reversed tension-compression stresses δzdW/MPa |
40 |
50 |
60 |
75 |
85 |
|
Fracture toughness KIC/MPa3/4 |
320 |
400 |
480 |
560 |
650 |
