We Shanghai Special Metal Co., Ltd supplies various spare parts of chain grating machines, e.g. grate plate, grate side casting, slide rail, spading plate, chain link...

The main equipments of producing pellet by rotary kiln are chain grating machine, rotary kiln and circular cooler. And the chain grating machine is the most important equipment. Chain grating machine's main part is grate bed, which is to dry and preheat pellet by remained heat flow. Grate bed consists of chain link, grate plate, side plate, pipe spacer and protecting sleeve. Grate plate is shaped and casted by heat-resisting alloy steel, its casting tolerance is CT6. The grate plate castings cycle through the grate furnace on a continuous cycle and carry the magnetite iron ore pellets through the process and into the kiln. The maximum temperature of the grate plate goes to approximately 650ºC when it discharges its load into the kiln and then the castings cool down to approximately 150ºC in free air, as it returns to the tail end.

Production Process 
1. Wooden pattern Production 
2. Molding
3. Pouring
4. First cleaning
5. Heat treatment - grinding (inspection)
6. Rough machining (inspection)-finishing machining (inspection)
7. Packing-delivering

Quality Assurance 
The fabrication route is governed by the provisions of the implemented Quality System ISO 9001: 2000. The standard documentation ensures the full traceability of every process step:
Manufacturer test certificates according to DIN EN 10.204 § 3.1 including chemical composition, mechanical properties and non-destructive examination;
Dimensional check supported with a "as-built" sketch;
Record of the heat treatment chart