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
<=0.08
<=1.00
<=1.00
<=0.040
<=0.030
16.0-18.0
Mechanical Properties
Tensile Strength
>=400 MPa
Yield Strength
>=240 MPa
Elongation
>=20%
Hardness
<=200 HB
Condition
Annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 75 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 75
200
240
400
20
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, annealed5 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
8
over 16 to 40
240
400 to 700
15
over 40 to 63
240
400 to 700
15
over 63 to 100
240
400 to 630
20
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
220
150
215
200
210
250
205
300
200
350
195
400
190
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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