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
0.12-0.17
0.17-0.37
0.40-0.70
0.70-1.00
<=0.030
<=0.030
<=0.30
Mechanical Properties
Tensile Strength
>=685 MPa
Yield Strength
>=490 MPa
Elongation
>=12%
Hardness
<=179 HB
Condition
Quenched and tempered, test sample 15 mm; hardness is for bars delivered annealed or high temperature tempered
More data from GB/T 3077:2015
From the standard
Recommended heat treatment6 settings
Test sample size
15 mm
Quenching temperature (first)
880 deg C
Quenching temperature (second)
770 to 820 deg C
Quenching coolant
water, oil
Tempering temperature
180 deg C
Tempering coolant
oil, 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 tempered6 values
Test sample size
15 mm
Tensile strength Rm, min
685 MPa
Lower yield strength ReL, min
490 MPa
Elongation after fracture A, min
12 %
Reduction of area Z, min
45 %
Impact absorbed energy KU2, min
55 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
179
For steel bars delivered annealed or high temperature tempered.
Source: GB/T 3077:2015, Table 3
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