China · YB

Q690-E

YB/T 4206:2009 — Cold-formed steel of transmission towers

Chemical composition

wt% · log scale
0.0010.010.1110Als0.015B0.004C0.18Cr1Cu0.8Mn2Mo0.3N0.015Nb0.11Ni0.8P0.025S0.02Si0.6Ti0.2V0.12
  • min – max range
  • typical value

Mechanical properties

value range by condition
Tensile strength Rm550–720 MPaTensile strength Rm520–680 MPaTensile strength Rm490–650 MPaTensile strength Rm470–630 MPaTensile strength Rm370–500 MPaElongation A≥17 %Elongation A≥20 %Elongation A≥24 %Condition not statedYield strength Rp0.2440 MPaYield strength Rp0.2400 MPaYield strength Rp0.2370 MPaYield strength Rp0.2325 MPaYield strength Rp0.2225 MPat > 16mmYield strength Rp0.2460 MPaYield strength Rp0.2420 MPaYield strength Rp0.2390 MPaYield strength Rp0.2345 MPaYield strength Rp0.2235 MPat ≤ 16mm

Chemical composition

ElementminmaxSimilarRemarks
Als0.015
B0.004
C0.18
Cr1
Cu0.8
Mn2
Mo0.3
N0.015
Nb0.11
Ni0.8
P0.025
S0.02
Si0.6
Ti0.2
V0.12

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
Condition not stated550–720 屈服强度等级460；520–680 屈服强度等级420；490–650 屈服强度等级390；470–630 屈服强度等级345；370–500 屈服强度等级235≥17 屈服强度等级390；≥20 屈服强度等级345；≥24 屈服强度等级235
t > 16mm440 屈服强度等级460；400 屈服强度等级420；370 屈服强度等级390；325 屈服强度等级345；225 屈服强度等级235
t ≤ 16mm460 屈服强度等级460；420 屈服强度等级420；390 屈服强度等级390；345 屈服强度等级345；235 屈服强度等级235