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Crusher Parts Ni-hard1 Coal Mill Crusher Rolls Product Details Composition(%) C Si Mn Cr Mo Ni P/S Hardness Ni-hard1 3.2~3.6 0.3~0.6 0.4~0.8 2.0~2.75 ≤0.6 3.5~4.25 ≤0.05 ≥HRC54(eqv.HB550) Inspection ...