Some features of recrystallization in heating steel for rolling rolls
Conclusions
- 1.
The undesirable heredity of coarse-grained structure, obtained as a result of heating steels 90KhF and 9Kh2MF with pearlitic structure to 1000–1250°C, can be eliminated by subsequent austenitization with slow heating to 850°C.
- 2.
When the initial structure is martensitic (steels 90KhF and 9Kh2MF) and martensitic or bainitic (steel 75Kh2GMF), austenitization at 850°C does not ensure complete recrystallization — we find structural heredity, established metallographically or from the type of fracture.
- 3.
When the initial structure is pearlitic, grain refinement in steel 90KhF is encountered in the process of austenitization at 800–820°C, and in steel 9Kh2MF at 820–840°C.
When the initial structure is martensitic, recrystallization in both steels occurs only at 920–940°C.
Complete recrystallization in steel 75Kh2GMF with initial martensitic structure is found upon heating to 900–920°C, and with initial bainitic structures, to 920–940°C.
Keywords
Recrystallization Initial Structure Martensitic Structure Slow Heating Bainitic StructurePreview
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Literature cited
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