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
Ni
N
<=0.06
<=0.70
<=1.50
<=0.040
<=0.015
15.0-17.0
0.80-1.50
4.0-6.0
>=0.020
Mechanical Properties
Tensile Strength
<=1100 MPa
Hardness
<=320 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 condition5 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
320
-
-
1100
-
-
-
-
up to 160
+QT1
-
550
760
960
16
-
90
-
over 160 to 250
+QT1
-
550
760
960
-
14
-
70
up to 160
+QT2
-
700
900
1100
16
-
80
-
over 160 to 250
+QT2
-
700
900
1100
-
14
-
60
+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 tempered6 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
1150
380
750
900 to 1150
10
-
-
-
over 10 to 16
1150
380
750
900 to 1150
10
-
-
-
over 16 to 40
1100
320
700
900 to 1100
12
-
80
-
over 40 to 63
1100
320
700
900 to 1100
16
-
80
-
over 63 to 160
1100
320
700
900 to 1100
16
-
80
-
over 160 to 250
1100
320
700
900 to 1100
-
14
-
60
Bright bars, conditions 2H, 2B, 2G or 2P; quenched and tempered condition +QT2.
Source: IS 6603:2024, Table 18
Proof strength at elevated temperature7 temperatures
Temperature (deg C)
Rp0.2 min, +QT1 (MPa)
Rp0.2 min, +QT2 (MPa)
100
520
660
150
510
640
200
500
620
250
490
600
300
480
580
350
-
-
400
-
-
Minimum values, quenched and tempered; for guidance only.
Source: IS 6603:2024, Table 13
Hot forming and heat treatment3 conditions
Condition
Annealing temperature (deg C)
Cooling after annealing
Quenching temperature (deg C)
Quenching medium
Tempering temperature (deg C)
+A
600 to 650
furnace, air
-
-
-
+QT1
-
-
950 to 1050
oil, air
590 to 620
+QT2
-
-
950 to 1050
oil, air
550 to 620
Hot forming 1150 to 900 deg C, cooling: air. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23
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