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
Mo
Al (metallic)
Cu
0.12-0.20
0.10-0.35
0.40-0.80
<=0.04
<=0.04
<=0.30
<=0.35
0.25-0.35
<=0.02
<=0.30
Mechanical Properties
Tensile Strength
440-590 MPa
Yield Strength
>=260 MPa (0.2 % proof stress)
Elongation
>=24%
Condition
Seamless pipes, steel plates, N, N+T, thickness over 3 to 16 (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
Seamless pipes, steel plates
N, N+T
over 3 to 16
-
260
440
590
24
-
3a
Seamless pipes, steel plates
N, N+T
over 16 to 40
-
250
440
590
24
-
3a
Seamless pipes, steel plates
N, N+T
over 40 to 63
-
250
440
590
23
-
3a
Seamless pipes, steel plates
N, N+T
over 63 to 100
-
Note 8
440
590
22
-
3a
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
Seamless pipes, bars, forgings, steel plates, N, N+T, Q+T
237
232
218
200
167
153
148
143
139
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment9 entries
Normalising temperature
900 to 940 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
in quiet air
Tempering temperature
600 to 650 deg C
Tempering time
1.5 to 2 min per 1 mm thickness of pipe wall
Stress relief or tempering after bending or welding
600 to 650 deg C
Quenching temperature
900 to 940 deg C
Quenching medium
oil or water
Tempering temperature after quenching
600 to 650 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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