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
Co
<=0.030
<=0.50
<=1.50
<=0.035
<=0.010
26.0-29.0
4.0-5.0
5.5-9.5
0.30-0.50
<=1.00
0.50-2.00
Mechanical Properties
Tensile Strength
>=800 MPa
Yield Strength
>=650 MPa
Elongation
>=25%
Hardness
<=300 HB
Condition
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 5 mm; Tensile Strength is a minimum as printed, hardness for guidance only
More data from IS 6603:2024
From the standard
Mechanical properties by thickness or diameter1 size range
Thickness or diameter (mm)
Hardness HB (guidance)
Rp0.2 min (MPa)
Rm min (MPa)
A min (%)
KV2 min (J)
up to 5
300
650
800
25
100
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D; for rods only the tensile strength values apply.
Source: IS 6603:2024, Table 6
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
1050 to 1150 deg C
Cooling after solution annealing
water
Informative guideline (Annex A).
Source: IS 6603:2024, Table 21
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