Hard Grades
- These grades are produced from the primary decomposition products without further chemical processing.
- Typical properties of hard grades:
• onion skin structure
• Mechanically hard
• Fe content up to 97.8 %
• other elements (typically): C max. 1.0 %, N max. 0.9 %, O max. 0.5 %
Soft Grades
- These grades are produced by annealing of hard grades under hydrogen. In this process, the onion skin structure is lost, and the content of N, C, and O is reduced.
- Typical properties of soft grades:
• Polycrystalline structure
• Mechanically soft
• excellent compaction properties
• Fe content up to 99.8 %
• Low C, N, and O content
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