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
0.08-0.15
<=1.00
<=1.50
<=0.040
<=0.030
11.5-13.5
<=0.75
Mechanical Properties
Tensile Strength
<=730 MPa
Hardness
<=223 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
223
-
-
730
-
-
-
-
up to 75
+QT
-
345
540
-
15
-
25
-
+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
880
280
550
700 to 1000
9
-
-
-
over 10 to 16
880
280
500
700 to 1000
9
-
-
-
over 16 to 40
800
250
450
650 to 930
10
-
25
-
over 40 to 63
760
230
450
650 to 880
10
-
25
-
over 63 to 160
730
220
450
650 to 850
15
-
25
-
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, +QT (MPa)
100
420
150
410
200
400
250
385
300
365
350
355
400
305
Minimum values, quenched and tempered; for guidance only.
Source: IS 6603:2024, Table 13
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 rapid cooling)
slow cooling
-
-
-
+QT
-
-
950 to 1000
oil, water
700 to 750
Hot forming 1100 to 800 deg C, cooling: air. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23
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