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
Al (metallic)
Cu
0.15-0.25
0.10-0.35
0.90-1.40
<=0.04
<=0.04
<=0.30
<=0.30
0.40-0.60
<=0.02
<=0.30
Mechanical Properties
Tensile Strength
510-660 MPa
Yield Strength
>=355 MPa (0.2 % proof stress)
Elongation
>=21%
Condition
Steel plates, N+T, thickness over 3 to 16 (first row of Table 3)
More data from IS 1570 (Part 7):1992
From the standard
Mechanical properties at room temperature4 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
Steel plates
N+T
over 3 to 16
-
355
510
660
21
-
3a
Steel plates
N+T
over 16 to 40
-
345
510
660
21
-
3a
Steel plates
N+T
over 40 to 63
-
345
510
660
20
-
3a
Steel plates
N+T
over 63 to 100
-
Note 8
510
660
19
-
3a
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
Heat treatment6 entries
Normalising temperature (N+T)
880 to 930 deg C
Normalising time
1 to 2 min per 1 mm thickness of plate but not less than 20 min
Normalising cooling
in quiet air
Tempering temperature
600 to 650 deg C
Tempering time
1 to 3 min per 1 mm thickness but not less than 15 min
Stress relief or tempering after bending or welding
600 to 650 deg C, 2 min per 1 mm thickness but not less than 15 min
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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