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
<=0.50
2.0-4.0
<=0.030
<=0.005
23.0-25.0
7.0-8.0
21.0-23.0
0.45-0.55
0.30-0.60
Mechanical Properties
Tensile Strength
750-1050 MPa
Yield Strength
>=430 MPa
Elongation
>=40%
Condition
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 50 mm; Yield Strength is Rp0.2, Elongation is A (longitudinal)
More data from IS 6603:2024
From the standard
Mechanical properties by thickness or diameter1 size range
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 50
430
470
750 to 1050
40
-
100
-
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
Proof strength at elevated temperature10 temperatures
Temperature (deg C)
Rp0.2 min (MPa)
Rp1.0 min (MPa)
100
350
390
150
320
370
200
315
355
250
310
345
300
300
335
350
295
330
400
295
330
450
285
320
500
280
310
550
275
305
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 1000 deg C
Cooling after hot forming
air
Heat treatment symbol
+AT
Solution annealing temperature
1150 to 1200 deg C
Cooling after solution annealing
water, air (rapid cooling)
Informative guideline (Annex A).
Source: IS 6603:2024, Table 20
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