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
0.10-0.17
<=1.00
<=1.50
<=0.040
>=0.15
16.0-18.0
<=0.60
Mechanical Properties
Tensile Strength
<=730 MPa
Hardness
<=220 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
220
-
-
730
-
-
-
-
up to 60
+QT
-
500
650
850
12
-
-
-
over 60 to 160
+QT
-
500
650
850
10
-
-
-
+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
580
700 to 980
7
-
-
-
over 10 to 16
880
280
530
700 to 980
7
-
-
-
over 16 to 40
800
250
500
650 to 930
9
-
-
-
over 40 to 63
760
230
500
650 to 880
10
-
-
-
over 63 to 160
730
220
500
650 to 850
10
-
-
-
Bright bars, conditions 2H, 2B, 2G or 2P; quenched and tempered condition +QT.
Source: IS 6603:2024, Table 18
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
750 to 850
furnace, air
-
-
-
+QT
-
air
950 to 1070
oil, air
550 to 650
Hot forming 1100 to 800 deg C, cooling: air. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23
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