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
V
Cu
0.20-0.30
0.20-0.50
0.30-0.60
<=0.030
<=0.025
1.5-1.80
<=0.40
0.90-1.20
0.20-0.30
<=0.30
Mechanical Properties
Tensile Strength
>=630 MPa
Yield Strength
>=420 MPa (0.2 % proof stress)
Elongation
>=16%
Condition
Forgings of turbine shafts, N+T, thickness up to 900 (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
Forgings of turbine shafts
N+T
up to 900
at the average 200
420
630
-
16
-
-
Forgings of turbine shafts
N+T
-
do
500
630
-
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
200 deg C
250 deg C
300 deg C
350 deg C
400 deg C
450 deg C
Forgings, N+T, first row
330
350
340
330
320
-
Forgings, N+T, second row
460
440
420
400
370
330
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment3 entries
Normalising temperature (N+T)
940 to 970 deg C
Normalising cooling
quiet air
Tempering temperature
690 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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