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
0.07-0.15
0.50-1.00
5.0-7.5
<=0.030
<=0.015
17.5-19.5
6.5-8.5
0.20-0.30
Mechanical Properties
Tensile Strength
750-950 MPa
Yield Strength
>=340 MPa
Condition
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 15 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 15
340
370
750 to 950
-
-
-
-
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
225
255
150
200
230
200
185
210
250
175
200
300
165
190
350
155
180
400
-
-
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
1150 to 850 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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