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
0.95-1.20
<=1.00
<=1.00
<=0.040
<=0.030
16.0-18.0
<=0.75
<=0.60
Mechanical Properties
Hardness
<=285 HB
Condition
Soft annealed (+A), conditions 1C, 1E, 1D, 1X, 1G and 2D, thickness or diameter up to 100 mm; hardness as printed
More data from IS 6603:2024
From the standard
Mechanical properties by heat treatment condition1 rows
Thickness or diameter (mm)
Condition
Hardness HB
Rp0.2 min (MPa)
Rm min (MPa)
Rm max (MPa)
A min, longitudinal (%)
A min, transverse (%)
KV2 min, longitudinal (J)
KV2 min, transverse (J)
up to 100
+A
285
-
-
-
-
-
-
-
+A = soft annealed, +QT = quenched and tempered; for larger thickness the values shall be agreed upon.
Source: IS 6603:2024, Table 8
Hot forming and heat treatment1 conditions
Condition
Annealing temperature (deg C)
Cooling after annealing
Quenching temperature (deg C)
Quenching medium
Tempering temperature (deg C)
+A
780 to 840
furnace, air
-
-
-
Hot forming 1100 to 900 deg C, cooling: slow cooling. Informative guideline (Annex A).
Source: IS 6603:2024, Table 23
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