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
0.26-0.35
<=1.00
<=1.50
<=0.040
<=0.030
12.0-14.0
Mechanical Properties
Tensile Strength
<=800 MPa
Hardness
<=245 HB
Condition
Soft annealed (+A), conditions 1C, 1E, 1D, 1X, 1G and 2D, all sizes; hardness as printed
More data from IS 6603:2024
From the standard
Mechanical properties by heat treatment condition2 rows
Thickness or diameter (mm)
Condition
Hardness HB
Rp0.2 min (MPa)
Rm min (MPa)
Rm max (MPa)
A min, longitudinal (%)
A min, transverse (%)
KV2 min, longitudinal (J)
KV2 min, transverse (J)
-
+A
245
-
-
800
-
-
-
-
up to 75
+QT
-
540
740
-
12
-
12
-
+A = soft annealed, +QT = quenched and tempered; for larger thickness the values shall be agreed upon.
Source: IS 6603:2024, Table 8
Bright bars, annealed and quenched and tempered5 rows
Thickness or diameter (mm)
Annealed Rm max (MPa)
Annealed HB max (information)
Quenched and tempered Rp0.2 min (MPa)
Quenched and tempered Rm (MPa)
A5 min, longitudinal (%)
A5 min, transverse (%)
KV2 min, longitudinal (J)
KV2 min, transverse (J)
up to 10
950
305
700
900 to 1050
7
-
-
-
over 10 to 16
950
305
650
900 to 1150
7
-
-
-
over 16 to 40
900
280
650
850 to 1100
9
-
12
-
over 40 to 63
840
260
650
850 to 1050
9
-
12
-
over 63 to 160
800
245
650
850 to 1000
10
-
15
-
Bright bars, conditions 2H, 2B, 2G or 2P; quenched and tempered condition +QT.
Source: IS 6603:2024, Table 18
Hot forming and heat treatment2 conditions
Condition
Annealing temperature (deg C)
Cooling after annealing
Quenching temperature (deg C)
Quenching medium
Tempering temperature (deg C)
+A
800-900 (approx. 750 with air cooling)
slow cooling
-
-
-
+QT
-
-
920 to 980
oil
600 to 750
Hot forming 1100 to 800 deg C, cooling: slow cooling. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23
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