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
Ni
0.09-0.15
<=1.00
<=1.00
<=0.040
<=0.030
11.5-14.00
<=1.00
Mechanical Properties
Tensile Strength
470-670 MPa
Yield Strength
>=265 MPa (0.2 % proof stress)
Elongation
>=20%
Condition
Bars, forgings, plates, A, thickness up to 160 (first row of Table 3)
More data from IS 1570 (Part 7):1992
From the standard
Mechanical properties at room temperature2 rows
Product
Heat treatment
Thickness (mm)
Hardness (RB)
Rp0.2 min (MPa)
Rm min (MPa)
Rm max (MPa)
Elongation min (%)
KV (J)
Bend test D max
Bars, forgings, plates
A
up to 160
-
265
470
670
20
60
-
Bars, forgings, plates
Q+T
up to 160
175-235
420
590
780
16
40
-
Rm and elongation printed once for a group of thickness rows are repeated on each row; Rp0.2 'Note 8' is printed as in the standard; in case of dispute the tensile strength value is deciding.
Source: IS 1570 (Part 7):1992, Table 3
0.2 % proof stress at elevated temperature (guidance only)Rp0.2 min in MPa
Product, heat treatment, thickness
100 deg C
200 deg C
300 deg C
400 deg C
450 deg C
500 deg C
550 deg C
Bars, forgings, plates, A
235
240
225
205
195
185
175
Bars, forgings, plates, Q+T
410
380
345
305
285
-
-
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment5 entries
Annealing temperature (A)
700 to 780 deg C
Annealing cooling
air
Quenching temperature (Q+T)
950 to 1000 deg C
Quenching medium
air, oil
Tempering temperature after quenching
700 to 750 deg C, min 2 h
Indications are for guidance only except where test samples are reference heat treated; stress relief temperature should be at least 30 deg C below the tempering temperature.
Source: IS 1570 (Part 7):1992, Table 5
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