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
Ni
N
<=0.05
<=1.00
<=2.00
<=0.045
<=0.030
16.5-18.5
2.50-3.00
10.5-13.0
<=0.10
Mechanical Properties
Tensile Strength
520-720 MPa
Yield Strength
>=205 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
205
245
520 to 720
40
-
100
-
over 160 to 250
205
245
520 to 720
-
30
-
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 950
25
-
-
-
over 10 to 16
400
600 to 950
-
-
-
-
over 16 to 40
200
500 to 850
30
-
100
-
over 40 to 63
190
500 to 850
-
-
-
-
over 63 to 160
200
500 to 700
40
-
100
-
over 160 to 250
200
500 to 700
30
-
-
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
175
210
150
158
190
200
145
175
250
135
165
300
127
155
350
120
150
400
115
145
450
112
141
500
110
139
550
108
137
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
1020 to 1120 deg C
Cooling after solution annealing
water, air (rapid cooling)
Informative guideline (Annex A).
Source: IS 6603:2024, Table 20
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