need help in shear blade material selection & hardness process

dear all,
i am working on design & mfg. of TMT bar Cutting machine. I
have problem in the material selection of shearing blade and its
appropriate hardness. i have used S1 ( K455 ) material and hardness is
56 to 58 HRC. But i found failure like blade breaking and edge damages
while cutting.The TMT bar Is of 60 to 80 Kg/mm2.
Can anybody will help me regarding the balde material
selection and the hardness process?
Matter is too urgent. Please....
Thanks & regards,
Sainath Pohnerkar
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sainath Pohnerkar
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