Abrasion-Resistant White Cast Iron 22
-ASTM A532_A532M
- 5.2 Casting process and quality of castings
There are many factors influencing casting quality. And also casting process is the most important factor affecting casting quality. It is not difficult to see from table 13 that the related casting technology. Such as strengthening cooling, reducing inclusions, strengthening the full filling of castings. And improving the strength and toughness of white cast iron (bimetal compound casting process). Consequently it can significantly improve the performance of high chromium white cast iron. Generally speaking, the quality of castings can be improved by means of wet type, metal type, external cold iron. Same process as adding heat preservation on pour system and adding filter screen in gating system.
Table 13 Influence of several casting methods on the performance of high chromium cast iron products
| casting method | Products | Performance | |
| Lifetime comparison | Damage type | ||
| Wet casting | Blade of shot blasting machine | high | — |
| Dry mold casting | low | — | |
| Working face with external cold iron | Ø1.83M to 3.5m ball mill liner | 1.3-1.5 | — |
| Do not add cold iron | 1 | Most of them are broken | |
| Metal type | Grinding ball Ø30mm～120mm | 1.3-1.4 | Low crushing rate, roundness |
| Sand mold | 1 | High crushing rate, loss of circle | |
| Filter network | Impellers of impurity pump | 1.3-1.5 | Uniform wear |
| Non filter net | 1 | Concentrated wear, perforation | |
| Heat insulating casting head | Various grinding ball | high | Roundness |
| No insulating casting head | low | Big tends of loss of roundness | |
| Bimetal compound casting | Large ball mill liner | 2-3 | — |
| Single metal | 1 | Break off | |
