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
<=0.030
<=0.70
<=2.00
<=0.035
<=0.015
24.0-26.0
2.5-4.0
5.0-7.5
0.15-0.30
1.00-2.50
Mechanical Properties
Tensile Strength
>=700 MPa
Yield Strength
>=500 MPa
Elongation
>=25%
Hardness
<=270 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
270
500
700
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
Bright bars, solution annealed5 rows
Thickness or diameter (mm)
Rp0.2 min (MPa)
Rm (MPa)
A5 min (%)
KV2 min (J)
up to 10
-
-
-
-
over 10 to 16
-
-
-
-
over 16 to 40
500
700 to 1050
25
100
over 40 to 63
500
700 to 900
25
100
over 63 to 160
500
700 to 900
25
100
Bright bars, conditions 2H, 2B, 2G or 2P; A5 valid for 5 mm and above.
Source: IS 6603:2024, Table 16
Proof strength at elevated temperature4 temperatures
Temperature (deg C)
Rp0.2 min (MPa)
100
450
150
420
200
400
250
380
Minimum values, solution annealed (+AT); for guidance only.
Source: IS 6603:2024, Table 11
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
1040 to 1120 deg C
Cooling after solution annealing
water
Informative guideline (Annex A).
Source: IS 6603:2024, Table 21
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