Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
P
S
Nb
V
Ti
Cr
Ni
Cu
Mo
N
B
Al
<=0.18
<=0.60
<=2.60
<=0.030
<=0.025
0.01-0.11
0.01-0.12
0.006-0.05
<=1.00
<=0.80
<=0.80
<=0.30
<=0.025
<=0.004
>=0.015
Mechanical Properties
Tensile Strength
710-880 MPa
Yield Strength
>=620 MPa
Elongation
>=15%
Condition
Thermomechanical processed (TMCP), nominal thickness or diameter up to 16 mm (tensile strength: up to 40 mm)
More data from GB/T 1591:2018
From the standard
Upper yield strength by thickness6 thickness ranges
Thickness or diameter (mm)
Upper yield strength ReH, min (MPa)
up to 16
620
over 16 to 40
610
over 40 to 63
600
over 63 to 80
580
over 80 to 100
-
over 100 to 120
-
Thermomechanical processed (TMCP) condition.
Source: GB/T 1591:2018, Table 10
Tensile strength by thickness5 thickness ranges
Thickness or diameter (mm)
Tensile strength Rm (MPa)
up to 40
710-880
over 40 to 63
690-880
over 63 to 80
670-860
over 80 to 100
-
over 100 to 120
-
Thermomechanical processed (TMCP) condition.
Source: GB/T 1591:2018, Table 10
Elongation after fracturesingle value
Elongation A, min
15 %
Single value printed for all thicknesses.
Source: GB/T 1591:2018, Table 10
Charpy V-notch impact energy1 test temperature(s)
Test temperature
Longitudinal KV2, min (J)
Transverse KV2, min (J)
-20 deg C
47
27
Standard 10 mm x 10 mm x 55 mm specimen.
Source: GB/T 1591:2018, Table 11
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