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
N
<=0.030
<=1.00
<=2.00
<=0.045
<=0.030
18.0-20.0
10.0-12.0
<=0.10
Mechanical Properties
Tensile Strength
480-680 MPa
Yield Strength
>=180 MPa
Elongation
>=40%
Condition
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 160 mm; Yield Strength is Rp0.2, Elongation is A (longitudinal)
More data from IS 6603:2024
From the standard
Mechanical properties by thickness or diameter2 size ranges
Thickness or diameter (mm)
Rp0.2 min (MPa)
Rp1.0 min (MPa)
Rm (MPa)
A min, longitudinal (%)
A min, transverse (%)
KV2 min, longitudinal (J)
KV2 min, transverse (J)
up to 160
180
220
480 to 680
40
-
100
-
over 160 to 250
-
-
480 to 680
-
35
-
60
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D; elongation and proof strength are not valid for rod.
Source: IS 6603:2024, Table 5
Bright bars, solution annealed6 rows
Thickness or diameter (mm)
Rp0.2 min (MPa)
Rm (MPa)
A5 min, longitudinal (%)
A5 min, transverse (%)
KV2 min, longitudinal (J)
KV2 min, transverse (J)
up to 10
400
600 to 930
25
-
-
-
over 10 to 16
380
600 to 930
25
-
-
-
over 16 to 40
180
460 to 830
-
-
-
-
over 40 to 63
180
460 to 830
30
-
100
-
over 63 to 160
180
460 to 680
-
-
-
-
over 160 to 250
180
460 to 680
-
35
-
60
Bright bars, conditions 2H, 2B, 2G or 2P; A5 valid for 5 mm and above.
Source: IS 6603:2024, Table 15
Proof strength at elevated temperature10 temperatures
Temperature (deg C)
Rp0.2 min (MPa)
Rp1.0 min (MPa)
100
145
180
150
130
160
200
118
145
250
108
135
300
100
127
350
94
121
400
89
116
450
85
112
500
81
109
550
80
108
Minimum values, solution annealed (+AT); for guidance only.
Source: IS 6603:2024, Table 10
Hot forming and solution annealingguideline temperatures
Hot forming temperature
1200 to 900 deg C
Cooling after hot forming
air
Heat treatment symbol
+AT
Solution annealing temperature
1000 to 1100 deg C
Cooling after solution annealing
water, air (rapid cooling)
Informative guideline (Annex A).
Source: IS 6603:2024, Table 20
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