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
Cr
Mo
Ni
P
S
Cu
0.38-0.43
0.17-0.37
0.60-0.80
0.70-0.90
0.20-0.30
1.65-2.00
<=0.030
<=0.030
<=0.30
Mechanical Properties
Tensile Strength
>=1050 MPa
Yield Strength
>=980 MPa
Elongation
>=12%
Hardness
<=269 HB
Condition
Quenched and tempered, test sample 25 mm; hardness is for bars delivered annealed or high temperature tempered
More data from GB/T 3077:2015
From the standard
Recommended heat treatment2 settings
Treatment 1 (sample 25 mm)
Normalizing at 890 deg C, quenching 850 deg C oil, tempering 560 to 580 deg C air
Treatment 2 (specimen)
Normalizing at 890 deg C, quenching 850 deg C oil, tempering at 220 deg C twice, air
Allowable deviation: quenching +/-15 deg C, low temperature tempering +/-20 deg C, high temperature tempering +/-50 deg C.
Source: GB/T 3077:2015, Table 3
Mechanical properties, quenched and tempered2 treatments
Treatment
Tensile strength Rm, min (MPa)
Lower yield strength ReL, min (MPa)
Elongation A, min (%)
Reduction of area Z, min (%)
Impact KU2, min (J)
1 (sample 25 mm)
1050
980
12
45
48
2 (specimen)
1790
1500
6
25
-
Minimum values; headline uses treatment 1.
Source: GB/T 3077:2015, Table 3
Brinell hardness, annealed or high temperature tempered1 value
Brinell hardness HBW, max
269
For steel bars delivered annealed or high temperature tempered.
Source: GB/T 3077:2015, Table 3
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