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
P
S
Cu
0.32-0.39
1.10-1.40
0.80-1.10
1.10-1.40
<=0.030
<=0.030
<=0.30
Mechanical Properties
Tensile Strength
>=1620 MPa
Yield Strength
>=1280 MPa
Elongation
>=9%
Hardness
<=241 HB
Condition
Quenched and tempered, test sample Specimen (size not stated); hardness is for bars delivered annealed or high temperature tempered
More data from GB/T 3077:2015
From the standard
Recommended heat treatment3 settings
Treatment 1
Heated to 880 deg C, isothermal quenching at 280 to 310 deg C
Treatment 2 quenching
950 deg C first, 890 deg C second, oil
Treatment 2 tempering
230 deg C, air or oil
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 tempered6 values
Test sample size
Specimen (size not stated)
Tensile strength Rm, min
1620 MPa
Lower yield strength ReL, min
1280 MPa
Elongation after fracture A, min
9 %
Reduction of area Z, min
40 %
Impact absorbed energy KU2, min
31 J
Minimum values after the recommended heat treatment; if sample is larger than the bar, treat the actual bar.
Source: GB/T 3077:2015, Table 3
Brinell hardness, annealed or high temperature tempered1 value
Brinell hardness HBW, max
241
For steel bars delivered annealed or high temperature tempered.
Source: GB/T 3077:2015, Table 3
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