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
<=2.00
<=0.025
<=0.020
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
770-940 MPa
Yield Strength
>=690 MPa
Elongation
>=14%
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
690
over 16 to 40
680
over 40 to 63
670
over 63 to 80
650
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
770-940
over 40 to 63
750-920
over 63 to 80
730-900
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
14 %
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)
-40 deg C
31
20
Standard 10 mm x 10 mm x 55 mm specimen.
Source: GB/T 1591:2018, Table 11
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