International standard · ISO

18 CrMo 4 E

ISO 4954:1993 — ISO 4954

Chemical composition

wt% · log scale
0.010.1110C0.15 – 0.21Cr0.9 – 1.2Mn0.6 – 0.9Mo0.15 – 0.25P0.035S0.035Si0.4
  • min – max range
  • typical value

Mechanical properties

value range by condition
Tensile strength RmReduction of area Z62.00Hot rolled bars, wire rods, drawn products +C+AC+LC, 2 < d <= 100 mmTensile strength Rm540.00Reduction of area Z62 %Hot rolled bars, wire rods, drawn products +C+AC, 2 < d <= 100 mmTensile strength RmReduction of area Z60.00Hot rolled bars, wire rods, drawn products, annealed to obtain spheroidal carbides, or , 2 < d <= 100 mmYield strength Rp0.2≥600 MPaTensile strength Rm920–1270 MPaImpact energy Kv/Ku≥25 JElongation A≥9 %bars, hardened , d = 16 mm

Chemical composition

ElementminmaxSimilarRemarks
C0.150.21
Cr0.91.2
Mn0.60.9
Mo0.150.25
P0.035
S0.035
Si0.4

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
Hot rolled bars, wire rods, drawn products +C+AC+LC, 2 < d <= 100 mm62.00
Hot rolled bars, wire rods, drawn products +C+AC, 2 < d <= 100 mm540.0062
Hot rolled bars, wire rods, drawn products, annealed to obtain spheroidal carbides, or , 2 < d <= 100 mm60.00
bars, hardened , d = 16 mm≥600920–1270≥9 Percentage elongation after fracture (Lo = 5 do where Lo≥25 Charpy U notch; Average of three individual values; If testing of V notch impact test pieces is required
bars, hardened , d = 30 mm≥540820–1170≥10 Percentage elongation after fracture (Lo = 5 do where Lo≥25 Charpy U notch; Average of three individual values; If testing of V notch impact test pieces is required
bars, hardened , d = 63 mm≥480710–1060≥11 Percentage elongation after fracture (Lo = 5 do where Lo≥25 Charpy U notch; Average of three individual values; If testing of V notch impact test pieces is required