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
0.12-0.22
<=1.00
<=1.50
<=0.040
<=0.030
15.0-17.0
1.25-2.50
Mechanical Properties
Tensile Strength
<=950 MPa
Hardness
<=295 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 condition3 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
295
-
-
950
-
-
-
-
up to 160
+QT1
-
600
800
950
14
-
20
-
up to 160
+QT2
-
700
900
1050
12
-
15
-
+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
1050
330
750
850 to 1100
7
-
-
-
over 10 to 16
1050
330
700
850 to 1100
7
-
-
-
over 16 to 40
1000
310
650
800 to 1050
9
-
25
-
over 40 to 63
950
295
650
800 to 1000
12
-
25
-
over 63 to 160
950
295
650
800 to 950
12
-
16
-
Bright bars, conditions 2H, 2B, 2G or 2P; quenched and tempered condition +QT1.
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
515
565
150
495
525
200
475
505
250
460
490
300
440
470
350
405
430
400
355
375
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
680 to 800
furnace, air
-
-
-
+QT1
-
-
950 to 1050
oil, air
750 to 800 + 650 to 700
+QT2
-
-
950 to 1050
oil, air
600 to 650
Hot forming 1100 to 800 deg C, cooling: slow cooling. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23
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