Italy · UNI

C 40

UNI 7065:1972 — UNI 7065

Chemical composition

wt% · log scale
0.010.11C0.38 – 0.43Mn0.4 – 0.65P0.02S0.02Si0.35
  • min – max range
  • typical value

Mechanical properties

value range by condition
Tensile strength Rm≤510 MPaHardnessHRHardnessHBElongation A≥21 %

Chemical composition

ElementminmaxSimilarRemarks
C0.380.43
Mn0.40.65
P0.02
S0.02
Si0.35

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
steel strip, annealed≤510≥21 L0=80 mmHR ≤76 HRB；HB ≤135 HRB

Heat treatment

Type1
Heat-treatment curveHardness-Tempering