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Precision steel tubes destined for production of bearings Chemical Composition:GCr15 C:0.95-1.05 Mn:0.20-0.40 Si:0.15-0.35 S:≤0.020 P:≤0.027 Cr:1.30-1.65 100Cr6 C :0.95~1.05 Si:0.15~0.35 Mn:0.25~0.45 ...