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
0.16-0.25
<=1.00
<=1.50
<=0.040
<=0.030
12.0-14.0
Mechanical Properties
Tensile Strength
<=900 MPa
Hardness
<=230 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
230
-
-
900
-
-
-
-
up to 160
+QT1
-
500
700
850
13
-
25
-
up to 160
+QT2
-
600
800
950
12
-
20
-
+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
910
290
600
750 to 1000
8
-
-
-
over 10 to 16
910
290
550
750 to 1000
8
-
-
-
over 16 to 40
850
260
500
700 to 950
10
-
25
-
over 40 to 63
800
250
500
700 to 900
12
-
25
-
over 63 to 160
760
230
500
700 to 850
13
-
25
-
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
460
515
150
445
495
200
430
475
250
415
460
300
395
440
350
365
405
400
330
355
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
745 to 825
air
-
-
-
+QT1
-
-
950 to 1050
oil, air, water
650 to 750
+QT2
-
-
950 to 1050
oil, air, water
600 to 700
Hot forming 1100 to 800 deg C, cooling: slow cooling. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23
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