Characteristics For Cold Rolled High Carbon Spring Steels

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Steel Designation
BS EN 10132-4		 CHEMICAL COMPOSITION weight % (cast analysis) Hardness for Delivery Condition (reference values)
Name Number C Si Mn P max S max Cr Mo max V max Ni Annealed (+A) or annealed and skin passed (+LC) Rockwell ‘B’ scale Quenched and Tempered (+QT) Rockwell ‘C’ scale
C55S 1.1204 0.52-0.60 0.15-0.35 0.60-0.90 0.025 0.025 0.40 max 0.10 - 0.40 max 90 max 34 - 50.5
C60S 1.1211 0.57-0.65 0.15-0.35 0.60-0.90 0.025 0.025 0.40 max 0.10 - 0.40 max 91 max 35 - 51.5
C67S 1.1231 0.65-0.73 0.15-0.35 0.60-0.90 0.025 0.025 0.40 max 0.10 - 0.40 max 92 max 38.5 - 54
C75S 1.1248 0.70-0.80 0.15-0.35 0.60-0.90 0.025 0.025 0.40 max 0.10 - 0.40 max 93 max 38.5 - 54
C85S 1.1269 0.80-0.90 0.15-0.35 0.40-0.70 0.025 0.025 0.40 max 0.10 - 0.40 max 94 max 38.5 - 55
C90S 1.1217 0.85-0.95 0.15-0.35 0.40-0.70 0.025 0.025 0.40 max 0.10 - 0.40 max 94 max 38.5 - 55
C100S 1.1274 0.95-1.05 0.15-0.35 0.30-0.60 0.025 0.025 0.40 max 0.10 - 0.40 max 95 max 38.5 - 57
C125S 1.1224 1.20-1.30 0.15-0.35 0.30-0.60 0.025 0.025 0.40 max 0.10 - 0.40 max 97 max 38.5 - 57
48Si7 1.5021 0.45-0.52 1.60-2.00 0.50-0.80 0.025 0.025 0.40 max 0.10 - 0.40 max 95 max 38.5 - 50.5
56Si7 1.5026 0.52-0.60 1.60-2.00 0.60-0.90 0.025 0.025 0.40 max 0.10 - 0.40 max 96 max 38.5 - 50.5
51CrV4 1.8159 0.47-0.55 0.40 max 0.70-1.10 0.025 0.025 0.90-1.20 0.10 0.10-0.25 0.40 max 94 max 38.5 - 52.5
80CrV2 1.2235 0.75-0.85 0.15-0.35 0.30-0.50 0.025 0.025 0.40-0.60 0.10 0.15-0.25 0.40 max 95 max 38.5 - 52.5
75Ni8 1.5634 0.72-0.78 0.15-0.35 0.30-0.50 0.025 0.025 < 0.15 0.10 - 1.80-2.10 93 max 38.5 - 52.5
125Cr2 1.2002 1.20-1.30 0.15-0.35 0.25-0.40 0.025 0.025 0.40-0.60 0.10 - 0.40 max 97 max 42 - 57
102Cr6 1.2067 0.95-1.10 0.15-0.35 0.20-0.40 0.025 0.025 1.35-1.60 0.10 - 0.40 max 97 max 42 - 57