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
Cu
<=0.020
<=0.75
<=2.00
<=0.035
<=0.015
19.0-21.0
6.0-7.0
24.0-26.0
0.15-0.25
0.50-1.50
Mechanical Properties
Tensile Strength
650-850 MPa
Yield Strength
>=300 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
300
340
650 to 850
40
-
100
-
over 160 to 250
300
340
650 to 850
-
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 annealed5 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
550
700 to 1150
15
-
-
-
over 10 to 16
550
700 to 1150
15
-
-
-
over 16 to 40
300
650 to 1050
30
-
100
-
over 40 to 63
300
650 to 900
30
-
100
-
over 63 to 160
300
650 to 850
40
-
100
-
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
230
270
150
210
245
200
190
225
250
180
215
300
170
205
350
165
195
400
160
190
450
-
-
500
-
-
550
-
-
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 950 deg C
Cooling after hot forming
air
Heat treatment symbol
+AT
Solution annealing temperature
1120 to 1180 deg C
Cooling after solution annealing
water, air (rapid cooling)
Informative guideline (Annex A).
Source: IS 6603:2024, Table 20
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