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
Ti
<=0.030
<=1.00
<=0.50
<=0.040
>=0.15
17.5-19.0
2.00-2.50
0.30-0.80
Mechanical Properties
Tensile Strength
>=430 MPa
Yield Strength
>=280 MPa
Elongation
>=15%
Hardness
<=200 HB
Condition
Annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 100 mm; Tensile Strength is a minimum as printed
More data from IS 6603:2024
From the standard
Mechanical properties by thickness or diameter1 size range
Thickness or diameter (mm)
Hardness HB
Rp0.2 min (MPa)
Rm min (MPa)
A min (%)
up to 100
200
280
430
15
Annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D; for larger thicknesses the values have to be agreed.
Source: IS 6603:2024, Table 7
Proof strength at elevated temperature7 temperatures
Temperature (deg C)
Rp0.2 min (MPa)
100
250
150
240
200
230
250
220
300
210
350
205
400
200
Minimum values, annealed (+A); for guidance only.
Source: IS 6603:2024, Table 12
Hot forming and annealingguideline temperatures
Hot forming temperature
1100 to 800 deg C
Cooling after hot forming
air
Heat treatment symbol
+A
Annealing temperature
1000 to 1050 deg C
Cooling after annealing
air
Informative guideline (Annex A).
Source: IS 6603:2024, Table 22
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