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
Al
<=0.14
<=0.50
<=1.60
<=0.020
<=0.010
0.01-0.05
0.01-0.10
0.006-0.05
<=0.30
<=0.50
<=0.40
<=0.10
<=0.015
>=0.015
Mechanical Properties
Tensile Strength
470-630 MPa
Yield Strength
>=355 MPa
Elongation
>=22%
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
355
over 16 to 40
345
over 40 to 63
335
over 63 to 80
325
over 80 to 100
325
over 100 to 120
320
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
470-630
over 40 to 63
450-610
over 63 to 80
440-600
over 80 to 100
440-600
over 100 to 120
430-590
Thermomechanical processed (TMCP) condition.
Source: GB/T 1591:2018, Table 10
Elongation after fracturesingle value
Elongation A, min
22 %
Single value printed for all thicknesses.
Source: GB/T 1591:2018, Table 10
Charpy V-notch impact energy5 test temperature(s)
Test temperature
Longitudinal KV2, min (J)
Transverse KV2, min (J)
20 deg C
63
40
0 deg C
55
34
-20 deg C
47
27
-40 deg C
31
20
-60 deg C
27
16
Standard 10 mm x 10 mm x 55 mm specimen.
Source: GB/T 1591:2018, Table 11
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