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
Ti
Nb
<=0.030
<=1.00
<=1.00
<=0.040
<=0.015
17.5-18.5
0.10-0.60
<=1.00
Mechanical Properties
Tensile Strength
>=420 MPa
Yield Strength
>=200 MPa
Elongation
>=28%
Hardness
<=200 HB
Condition
Annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 50 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 50
200
200
420
28
Annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D; for larger thicknesses the values have to be agreed.
Source: IS 6603:2024, Table 7
Bright bars, annealed4 rows
Thickness or diameter (mm)
Rp0.2 min (MPa)
Rm (MPa)
A5 min (%)
up to 10
320
500 to 750
8
over 10 to 16
300
480 to 750
10
over 16 to 40
240
400 to 700
15
over 40 to 50
240
400 to 700
15
Bright bars, conditions 2H, 2B, 2G or 2P; A5 valid for 5 mm and above.
Source: IS 6603:2024, Table 17
Proof strength at elevated temperature7 temperatures
Temperature (deg C)
Rp0.2 min (MPa)
100
190
150
180
200
170
250
160
300
155
350
-
400
-
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
750 to 850 deg C
Cooling after annealing
air
Informative guideline (Annex A).
Source: IS 6603:2024, Table 22
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