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
Nb+Ta
0.04-0.10
<=0.75
<=2.00
<=0.045
<=0.030
17.00-19.00
9.00-13.00
>=10xC, <=1.00
Mechanical Properties
Tensile Strength
510-710 MPa
Yield Strength
>=205 MPa (0.2 % proof stress)
Elongation
>=30%
Condition
Pipes, bars, forgings, plates, Q, thickness - (first row of Table 3)
More data from IS 1570 (Part 7):1992
From the standard
Mechanical properties at room temperature3 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, bars, forgings, plates
Q
-
-
205
510
710
30
-
-
Pipes, bars, forgings, plates
Q
over 3 to 40
-
205
490
690
40
-
-
Pipes, bars, forgings, plates
Q
over 40 to 63
-
205
490
690
35
-
-
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, plates, Q
171
162
153
149
139
133
129
125
123
122
120
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment2 entries
Quenching temperature (Q)
950 to 1100 deg C
Quenching medium
air, water, oil
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 7Cr18Ni11NbH Listings on M-EX (For Sale)