China · GB

Q420 A

GB/T 28299:2012 — Hot-rolled flange plate for construction

Chemical composition

wt% · log scale
0.0010.010.1110C0.2Cr0.3Cu0.3Mn1.7Mo0.2N0.015Nb0.07Ni0.8P0.035S0.035Si0.5Ti0.2V0.2
  • min – max range
  • typical value

Mechanical properties

value range by condition
Yield strength Rp0.2≥340 MPaTensile strength Rm500–650 MPaElongation A≥18 %steel products 100mm < ≤ 150mmYield strength Rp0.2≥400 MPasteel products 16mm < ≤ 40mmYield strength Rp0.2≥380 MPaTensile strength Rm520–680 MPaElongation A≥18 %steel products 40mm < ≤ 63mmElongation A≥18 %steel products 63mm < ≤ 100mm

Chemical composition

ElementminmaxSimilarRemarks
C0.2
Cr0.3
Cu0.3
Mn1.7
Mo0.2
N0.015
Nb0.07
Ni0.8
P0.035
S0.035
Si0.5
Ti0.2
V0.2

Mechanical properties

Heat treatment / conditionYield strengthTensile strengthElongationReduction of areaImpact energyHardness
steel products 100mm < ≤ 150mm≥340500–650≥18
steel products 16mm < ≤ 40mm≥400
steel products 40mm < ≤ 63mm≥380520–680≥18
steel products 63mm < ≤ 100mm≥18
steel products 63mm < ≤ 80mm≥360520–680
steel products 80mm < ≤ 100mm≥360520–680
steel products ≤ 16mm≥420
steel products ≤ 40mm520–680≥19