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
Cr
Mo
V
Al (metallic)
0.10-0.18
0.10-0.35
0.40-0.70
<=0.040
0.30-0.60
0.50-0.70
0.22-0.32
<=0.02
Mechanical Properties
Tensile Strength
460-610 MPa
Yield Strength
>=275 MPa (0.2 % proof stress)
Elongation
>=15%
Condition
Pipes, N+T, thickness - (first row of Table 3)
More data from IS 1570 (Part 7):1992
From the standard
Mechanical properties at room temperature6 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
Pipes
N+T
-
-
275
460
610
15
-
-
Plates
N+T
over 3 to 16
-
285
460
610
19
-
3.5a
Plates
N+T
over 16 to 40
-
285
460
610
19
-
3.5a
Plates
N+T
over 40 to 63
-
285
460
610
19
-
3.5a
Plates
N+T
over 63 to 100
-
Note 8
460
610
19
-
3.5a
Bars, forgings
N+T, Q+T
-
-
275
460
610
16
-
-
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
150 deg C
200 deg C
250 deg C
300 deg C
350 deg C
400 deg C
450 deg C
500 deg C
550 deg C
600 deg C
Pipes, plates, bars, forgings, N+T, Q+T
259
248
235
218
192
184
177
168
155
148
135
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment9 entries
Normalising temperature (N+T, Q+T)
930 to 980 deg C
Normalising time
1 to 2 min per 1 mm thickness of forging or pipe wall but not less than 20 min
Normalising cooling
pipes in quiet air; forgings up to 50 mm in quiet air, above 50 to 100 mm in compressed air, above 100 mm in oil
Tempering temperature
670 to 720 deg C
Tempering time
min 3 h
Stress relief or tempering after bending or welding
680 to 740 deg C
Quenching temperature
975 to 1000 deg C
Quenching medium
oil
Tempering temperature after quenching
730 to 750 deg C
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
Active IS 1570 (Part 7):1992 12Cr2Mo5V2H Listings on M-EX (For Sale)