EN ( European Norm ) Steel Hardness Chart (HRC)

EN Grade Material Type Condition Hardness (HRC)
EN1AFree Cutting SteelAs Supplied10–20
EN3Low Carbon SteelAnnealed10–18
EN8Medium Carbon SteelNormalized20–30
EN8Medium Carbon SteelHardened & Tempered28–35
EN9High Carbon SteelHardened45–55
EN15Carbon Manganese SteelHardened40–50
EN18Alloy SteelHardened40–48
EN19Alloy Steel (Cr-Mo)Hardened & Tempered28–45
EN20Case Hardening SteelCarburized55–62 (surface)
EN24High Tensile Alloy SteelHardened & Tempered32–50
EN25Nickel Chromium SteelHardened35–45
EN26High Strength Alloy SteelHardened40–50
EN30Nickel Chromium SteelHardened48–55
EN31Bearing SteelFully Hardened58–65
EN32Case Hardening SteelCarburized55–62
EN34Nickel Chromium SteelHardened45–55
EN36Case Hardening Alloy SteelCarburized58–62
EN40BNitriding SteelNitrided65–75 (surface)
EN41BNitriding SteelNitrided65–72
EN42Spring SteelHardened45–55
EN43Carbon SteelNormalized20–30
EN45Spring SteelHardened45–55
EN47Spring SteelHardened48–56
EN48Spring SteelHardened48–55
EN52Silicon SteelHardened45–52
EN56Spring SteelHardened50–58
EN57Spring SteelHardened48–55

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Pratham Heat Treatment