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
Mo
0.35-0.45
0.10-0.35
0.40-0.70
<=0.035
<=0.035
1.00-1.50
0.50-0.80
Mechanical Properties
Tensile Strength
850-1000 MPa
Yield Strength
>=635 MPa (0.2 % proof stress)
Elongation
>=14%
Condition
Bars, forgings, Q+T, thickness up to 200 (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 200
-
635
850
1000
14
30
-
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
Bars, forgings, Q+T
630
610
575
525
490
450
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment3 entries
Quenching temperature (Q+T)
840 to 870 deg C
Quenching medium
oil
Tempering temperature after quenching
600 to 700 deg C
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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