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
<=0.030
<=1.00
<=2.00
<=0.040
<=0.010
21.5-24.0
<=0.45
1.00-2.90
0.16-0.28
Mechanical Properties
Tensile Strength
>=650 MPa
Yield Strength
>=380 MPa
Elongation
>=30%
Hardness
<=290 HB
Condition
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 160 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 160
290
380
650
30
40
Solution annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D; for rods only the tensile strength values apply.
Source: IS 6603:2024, Table 6
Bright bars, solution annealed3 rows
Thickness or diameter (mm)
Rp0.2 min (MPa)
Rm (MPa)
A5 min (%)
KV2 min (J)
up to 16
600
650 to 1100
15
-
over 16 to 40
500
700 to 1100
15
-
over40
500
700 to 1100
20
-
Bright bars, conditions 2H, 2B, 2G or 2P; A5 valid for 5 mm and above.
Source: IS 6603:2024, Table 16
Hot forming and solution annealingguideline temperatures
Hot forming temperature
1100 to 950 deg C
Cooling after hot forming
air
Heat treatment symbol
+AT
Solution annealing temperature
980 to 1100 deg C
Cooling after solution annealing
water, air
Informative guideline (Annex A).
Source: IS 6603:2024, Table 21
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