United Kingdom · B.S.

20 MoCr 4

BS EN 10084:1998 — Case hardening steels. Technical delivery conditions

Chemical composition

wt% · log scale
0.010.1110C0.17 – 0.23Cr0.3 – 0.6Mn0.7 – 1Mo0.4 – 0.5P0.035S0.035Si0.4
  • min – max range
  • typical value

Mechanical properties

value range by condition
Tensile strength RmOpen-die and closed-die forgings hardened and tempered 16 < d <= 40 mmTensile strength RmOpen-die and closed-die forgings hardened and tempered d <= 16 mmbars, billets, semi-finished products, flatsHardnessSteel barbars, open die forgings and die forgings +S, semi-finished products, flatsHardnessSteel barbars, open die forgings and die forgings +TH, semi-finished products, flatsHardnessSteel barbars, open die forgings and die forgings +A, semi-finished products, flats

Chemical composition

ElementminmaxSimilarRemarks
C0.170.23
Cr0.30.6
Mn0.71
Mo0.40.5
P0.035
S0.035
Si0.4

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
bars, billets, semi-finished products, flatsOpen-die and closed-die forgings hardened and tempered 16 < d <= 40 mm；Open-die and closed-die forgings hardened and tempered d <= 16 mm
bars, open die forgings and die forgings +S, semi-finished products, flatsSteel bar HB
bars, open die forgings and die forgings +TH, semi-finished products, flatsSteel bar HB
bars, open die forgings and die forgings +A, semi-finished products, flatsSteel bar HB
bars, open die forgings and die forgings, -+FP, semi-finished products, flatsSteel bar HB

Heat treatment

Type1
Heat-treatment curveCCT
Heat-treatment curveHardenability