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
<=0.08
<=1.00
<=2.00
<=0.045
<=0.030
17.5-20.0
8.0-10.5
<=0.10
Mechanical Properties
Tensile Strength
510-710 MPa
Yield Strength
>=200 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
200
240
510 to 710
40
-
100
-
over 160 to 250
200
240
510 to 710
-
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 950
25
-
-
-
over 10 to 16
400
600 to 950
25
-
-
-
over 16 to 40
190
600 to 850
30
-
100
-
over 40 to 63
190
580 to 850
30
-
100
-
over 63 to 160
190
500 to 700
45
-
100
-
over 160 to 250
190
500 to 700
-
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
155
190
150
140
170
200
127
155
250
118
145
300
110
135
350
104
129
400
98
125
450
95
122
500
92
120
550
90
120
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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