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
Al (metallic)
0.08-0.15
0.10-0.50
0.30-0.70
<=0.040
<=0.040
1.90-2.60
0.90-1.15
<=0.02
Mechanical Properties
Tensile Strength
410-560 MPa
Yield Strength
>=135 MPa (0.2 % proof stress)
Condition
Pipes, A, thickness - (first row of Table 3)
More data from IS 1570 (Part 7):1992
From the standard
Mechanical properties at room temperature4 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
A
-
-
135
410
560
-
-
-
Pipes
N+T
-
-
275
490
640
16
-
-
Bars, forgings
M+T
-
-
275
490
640
16
-
-
Bars, forgings
Q+T
-
-
335
540
690
15
-
-
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, bars, forgings, A
108
99
92
85
80
76
72
69
66
-
-
Pipes, bars, forgings, N+T, Q+T
261
253
245
236
230
224
218
205
189
167
145
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment9 entries
Normalising temperature (N+T, Q+T)
900 to 960 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
as for type 10
Tempering temperature
650 to 780 deg C
Tempering time
1 to 3 min per 1 mm thickness but not less than 15 min
Stress relief or tempering after bending or welding
730 to 760 deg C, 2 min per 1 mm thickness but not less than 15 min
Quenching temperature
930 to 1030 deg C
Quenching medium
oil or water
Tempering temperature after quenching
650 to 760 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
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