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
<=0.05
<=0.70
0.50-1.00
<=0.040
<=0.015
12.0-14.0
0.30-1.00
3.5-4.5
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 condition7 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
700
800
15
-
70
-
over 160 to 250
+QT1
-
550
700
800
-
12
-
50
up to 160
+QT2
-
620
780
980
15
-
70
-
over 160 to 250
+QT2
-
620
780
980
-
12
-
50
up to 160
+QT3
-
800
900
1100
12
-
50
-
over 160 to 250
+QT3
-
800
900
1100
-
10
-
40
+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 tempered1 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)
all sizes
-
-
620
795
15
-
-
-
Bright bars, conditions 2H, 2B, 2G or 2P; quenched and tempered condition +QT.
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)
Rp0.2 min, +QT3 (MPa)
100
500
590
720
150
490
575
690
200
480
560
665
250
470
545
640
300
460
530
620
350
450
515
-
400
-
-
-
Minimum values, quenched and tempered; for guidance only.
Source: IS 6603:2024, Table 13
Hot forming and heat treatment4 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
650 to 700 + 600 to 620
+QT2
-
-
950 to 1050
oil, air
550 to 600
+QT3
-
-
950 to 1050
oil, air
520 to 580
Hot forming 1150 to 900 deg C, cooling: air. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23
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