International standard · ISO

CS70

ISO 4960:2007 — Cold-reduced carbon steel strip with a mass fraction of carbon over 0,25 % third edition

Chemical composition

wt% · log scale
0.0010.010.1110C0.65 – 0.75Cr+Mo0.16Cr+Ni+Cu+Mo0.5Mn0.6 – 0.9Mo0.06Nb0.008P0.035S0.03Si0.1 – 0.35Ti0.008V0.008
  • min – max range
  • typical value

Mechanical properties

value range by condition
Tensile strength Rm≤1275 MPasheet, strip +QT, t <= 2.5 mmTensile strength Rm640 MPaElongation A≤12 %sheet, strip, annealedHardness钢带  退火sheet, HRHardness钢带  全部硬化  t => 1.0 mm  (t - 厚度)Hardness钢带  全部硬化  0.36 <= t < 1.0 mm  (t - 厚度)Hardness钢带  全部硬化  t < 0.36 mm  (t - 厚度)Hardness钢带  淬火及回火 (QT)  t <= 2.5 mmHardness钢带  退火sheet, HV

Chemical composition

ElementminmaxSimilarRemarks
C0.650.75
Cr+Mo0.16
Cr+Ni+Cu+Mo0.5
Mn0.60.9Other manganese values can be specified upon agreement at the time of orderingOther manganese values can be specified upon agreement at the time of ordering
Mo0.06Product analysis: 0.07% maxProduct analysis: 0.07% max
Nb0.008Product analysis: 0.018% maxProduct analysis: 0.018% max
P0.035When specifiedWhen specified
S0.03When specifiedWhen specified
Si0.10.35Closer Si ranges can be provided upon agreement at the time of ordering.Closer Si ranges can be provided upon agreement at the time of ordering.
Ti0.008Product analysis: 0.018% maxProduct analysis: 0.018% max
V0.008Product analysis: 0.018% maxProduct analysis: 0.018% max

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
sheet, strip +QT, t <= 2.5 mm≤1275
sheet, strip, annealed640≤12
sheet, HR钢带  退火 89
sheet, HV钢带  全部硬化  t => 1.0 mm  (t - 厚度) ≤230；钢带  全部硬化  0.36 <= t < 1.0 mm  (t - 厚度) ≤240；钢带  全部硬化  t < 0.36 mm  (t - 厚度) ≤250；钢带  淬火及回火 (QT)  t <= 2.5 mm ≤375；钢带  退火 190