Table 5.
Basic properties of the materials used for piston rods.
| Material | Density (kg/dm3) | Minimum Yield Strength (MPa) | Minimum Tensile Strength (MPa) | Maximum Carbon Content (%) | Description |
|---|---|---|---|---|---|
| S235JR | 7.8 | 235 | 340 | 0.2 | low-carbon structural steel |
| S275JR | 7.9 | 275 | 410 | 0.21 | low-carbon structural steel |
| S355J0 | 7.8 | 355 | 490 | 0.2 | low-carbon structural steel |
| C45 | 7.8 | 305 | 580 | 0.42–0.5 | medium-carbon structural steel |
| C35 | 7.8 | 270 | 520 | 0.32–0.39 | medium-carbon structural steel |
| C55 | 7.8 | 330 | 640 | 0.5–0.6 | medium-carbon structural steel |
| 40Cr/40X | 7.8 | 785 | 810 | 0.37–0.44 | alloy steel |
| C45E | 7.8 | 305 | 580 | 0.42–0.5 | medium-carbon structural steel |
| 40HM/ 42CrMo4 |
7.8 | 750 * | 1000 | 0.38–0.45 | alloy steel |
| 20MnV6 | 7.8 | 410 | 550 | 0.22 | low-alloy structural steel |
| 19MnVS6 | 7.8 | 390 | 600 | 0.15–0.22 | non-alloy special steel |
| 38MnVS6 | 7.8 | 520 | 800 | 0.34–0.41 | alloy steel |
| 30CrNiMo8 | 7.8 | 830 | 980 | 0.26–0.34 | alloy structural steel |
| BS970070M20 | 7.8 | 210 | 410 | 0.24 | low-carbon structural steel |
| BS970070M55 | 7.8 | 330 | 640 | 0.52–0.6 | medium-carbon structural steel |
| 17-4PH | 7.8 | 1000 | 1100 | 0.07 | martensitic stainless steel |
| AISI 304 | 7.9 | 210 | 520 | 0.08 | austenitic stainless steel |
| AISI 410 | 7.8 | 415 | 450 | 0.15 | martensitic stainless steel |
| Al 7075-T6 | 2.8 | 430 * | 510 | – | Al-Zn alloy |
| POM | 1.41 | 67–69 | 67–85 | – | poly-oxymethylene |
* For aluminium alloy and 42CrMo4 steel, instead of the yield strength Re, the conventional yield strength Rp0.2 is given.