India · IS

21Cr4Mo2

IS 4432:2009 — IS 4432

Chemical composition

wt% · log scale
0.010.1110C0.26Cr0.9 – 1.2Mn0.6 – 0.9Mo0.15 – 0.3P0.035S0.035Si0.1 – 0.35
  • min – max range
  • typical value

Mechanical properties

value range by condition
Yield strength Rp0.2750.00Tensile strength Rm1100.00Elongation A8.00bars, forgings, carburized and hardened , <= 16 mm, billets, steel barsYield strength Rp0.2700.00Tensile strength Rm1000.00Elongation A9.00bars, forgings, carburized and hardened , > 16 <= 30 mm, billets, steel barsYield strength Rp0.2650.00Tensile strength Rm950.00Elongation A10.00bars, forgings, carburized and hardened , > 30 <= 63 mm, billets, steel barsHardnessBilletbars, HB, steel bars, forgings

Chemical composition

ElementminmaxSimilarRemarks
C0.26
Cr0.91.2
Mn0.60.9
Mo0.150.3
P0.035
S0.035
Si0.10.35

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
bars, forgings, carburized and hardened , <= 16 mm, billets, steel bars750.001100.008.00
bars, forgings, carburized and hardened , > 16 <= 30 mm, billets, steel bars700.001000.009.00
bars, forgings, carburized and hardened , > 30 <= 63 mm, billets, steel bars650.00950.0010.00
bars, HB, steel bars, forgingsBillet 170.00
bars, HB, steel bars, forgings, rolledBillet
bars, HB, steel bars, forgings, annealedBillet

Heat treatment

Type1
Heat-treatment curveHardenability