| Share | Phrase |
|---|
| 35.67% | hardened [consistence] steel |
| 8.54% | hardened [consistence] ring |
| 7.36% | hardened [consistence] material |
| 6.76% | hardened [consistence] insert |
| 6.15% | hardened [consistence] ball |
| 6.15% | hardened [consistence] layer |
| 5.53% | hardened [consistence] pin |
| 4.92% | hardened [consistence] strip |
| 4.40% | hardened [consistence] surface |
| 3.91% | hardened [consistence] plastic |
| 3.69% | hardened [consistence] dowel |
| 3.69% | hardened [consistence] sludge |
| 3.20% | hardened [consistence] metal |