France · AFNOR NF

38 MB 5

NF A37-504

Chemical composition

wt% · log scale
0.00010.0010.010.1110B0.0008 – 0.005C0.35 – 0.4Mn1.1 – 1.4P0.035S0.025Si0.1 – 0.4
  • min – max range
  • typical value

Mechanical properties

value range by condition
Tensile strength Rm860.00bars, coil, steel strip, quenched and temperedTensile strength Rm640.00Elongation A18 %bars, steel strip, annealed, > 0.5 <= 3 mm, coilHardnessCoilbars, steel strip, annealed, > 0.5 <= 3 mm, HR

Chemical composition

ElementminmaxSimilarRemarks
B0.00080.005
C0.350.4
Fe​​Bal​​
Mn1.11.4
P0.035
S0.025
Si0.10.4

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
bars, coil, steel strip, quenched and tempered860.00
bars, steel strip, annealed, > 0.5 <= 3 mm, coil640.0018
bars, steel strip, annealed, > 0.5 <= 3 mm, HRCoil 92.00

Heat treatment

Type1
Heat-treatment curveHardness-Tempering
Heat-treatment curveHardenability
Heat-treatment curveCCT