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
Cr
Ni
Mo
V
Nb
B
0.16-0.24
0.10-0.50
0.30-1.00
<=0.040
<=0.030
10-12
0.3-1.00
0.5-1.0
0.1-0.30
0.2-0.50
<=0.008
Mechanical Properties
Tensile Strength
900-1050 MPa
Yield Strength
>=750 MPa (0.2 % proof stress)
Elongation
>=10%
Condition
Bars, forgings, Q+T, thickness up to 250 (first row of Table 3)
More data from IS 1570 (Part 7):1992
From the standard
Mechanical properties at room temperature1 rows
Product
Heat treatment
Thickness (mm)
Hardness (RB)
Rp0.2 min (MPa)
Rm min (MPa)
Rm max (MPa)
Elongation min (%)
KV (J)
Bend test D max
Bars, forgings
Q+T
up to 250
265-310
750
900
1050
10
20
-
Rm and elongation printed once for a group of thickness rows are repeated on each row; Rp0.2 'Note 8' is printed as in the standard; in case of dispute the tensile strength value is deciding.
Source: IS 1570 (Part 7):1992, Table 3
0.2 % proof stress at elevated temperature (guidance only)Rp0.2 min in MPa
Product, heat treatment, thickness
100 deg C
200 deg C
300 deg C
400 deg C
450 deg C
500 deg C
550 deg C
600 deg C
Bars, forgings, Q+T
730
700
655
580
530
470
400
315
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment3 entries
Quenching temperature (Q+T)
1100 to 1150 deg C
Quenching medium
air, oil
Tempering temperature after quenching
670 to 750 deg C, min 2 h
Indications are for guidance only except where test samples are reference heat treated; stress relief temperature should be at least 30 deg C below the tempering temperature.
Source: IS 1570 (Part 7):1992, Table 5
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