EN 10083-3 – ROCKWELL C HARDNESS (HRC) WITH NORMAL HARDENABILITY REQUIREMENTS (+H)

EN 10083-3 – ROCKWELL C HARDNESS (HRC) WITH NORMAL HARDENABILITY REQUIREMENTS (+H)

Steel description Symbol Interval boundaries Distance in mm from the quenched end
Symbolic Numeric 1,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50
Steels without boron
25CrMo4 1.7218 + H máx 52 52 51 50 48 46 43 41 37 35 33 32 31 31 31
25CrMoS4 1.7213 mín 44 43 40 37 34 32 29 27 23 21 20
34CrMo4 1.7220 + H máx 57 57 57 56 55 54 53 52 48 45 43 41 40 40 39
34CrMoS4 1.7226 mín 49 49 48 45 42 39 36 34 30 28 27 26 25 24 24
42CrMo4 1.7225 + H máx 61 61 61 60 60 59 59 58 56 53 51 48 47 46 45
42CrMoS4 1.7227 mín 53 53 52 51 49 43 40 37 34 32 31 30 30 29 29
34CrNiMo6 1.6582 + H máx 58 58 58 58 57 57 57 57 57 57 57 57 57 57 57
mín 50 50 50 50 49 48 48 48 48 47 47 47 46 45 44
30CrNiMo8 1.6580 + H máx 56 56 56 56 55 55 55 55 55 54 54 54 54 54 54
mín 48 48 48 48 47 47 47 46 46 45 45 44 44 43 43
51CrV4 1.8159 + H máx 65 65 64 64 63 63 63 62 62 62 61 60 60 59 58
mín 57 56 56 55 53 52 50 48 44 41 37 35 34 33 32
Steels with boron
20MnB5 1.5530 +H máx 50 49 49 49 47 45 43 41 33 27
mín 42 41 40 37 30 22
30MnB5 1.5531 +H máx 56 55 55 54 53 51 50 47 40 37 33
mín 47 46 45 44 42 39 36 31 22
38MnB5 1.5532 +H máx 60 60 59 58 57 57 55 53 48 41 37 33 31
mín 52 51 50 49 47 44 41 35 28 24 20
27MnCrB5-2 1.7182 +H máx 55 55 55 54 54 53 52 51 47 44 40 37
mín 47 46 45 44 43 41 39 36 30 24 20
33MnCrB5-2 1.7185 +H máx 57 57 57 57 57 56 55 54 53 50 47 45
mín 48 47 47 46 45 44 43 41 36 31 25 20
39MnCrB6-2 1.7189 +H máx 59 59 59 59 58 58 58 58 57 57 56 55 54
mín 51 51 51 51 50 50 50 49 47 45 40 35 32
For orders with extreme hardness values with reduced hardening dispersion strips (+hh or +HL) can be prepared on request.

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Chemical composition

ABILITY TO SHEAR (+S) OR ANNEALING (+A)

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