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
<=0.08
<=1.00
<=1.00
<=0.040
<=0.030
16.0-18.0
0.90-1.40
Mechanical Properties
Tensile Strength
>=440 MPa
Condition
Annealed, conditions 1C, 1E, 1D, 1X, 1G and 2D, size range to be agreed; 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 (%)
-
-
-
440
-
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
340
540 to 700
8
over 10 to 16
320
500 to 700
12
over 16 to 40
280
440 to 700
15
over 40 to 63
280
440 to 700
15
over 63 to 100
280
440 to 660
18
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
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
750 to 850 deg C
Cooling after annealing
air
Informative guideline (Annex A).
Source: IS 6603:2024, Table 22
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