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
0.17-0.23
<=0.50
<=1.00
<=0.040
<=0.030
11.0-12.50
0.30-1.00
0.7-1.20
0.20-0.35
Mechanical Properties
Tensile Strength
780-930 MPa
Yield Strength
>=590 MPa (0.2 % proof stress)
Elongation
>=14%
Condition
Bars, forgings, Q+T1, thickness up to 250 (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
Bars, forgings
Q+T1
up to 250
255-280
590
780
930
14
27
-
Seamless pipe
Q+T2
up to 250
265-310
700
900
1050
11
20
-
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
200 deg C
300 deg C
400 deg C
450 deg C
500 deg C
550 deg C
600 deg C
Bars, forgings, Q+T1
560
530
480
420
380
335
280
205
Seamless pipes, Q+T2
650
600
550
485
440
390
330
250
For guidance only.
Source: IS 1570 (Part 7):1992, Table 4
Heat treatment8 entries
Stress relief or tempering after bending or welding (Q+T1)
740 to 780 deg C
Quenching temperature (Q+T1)
1020 to 1070 deg C
Quenching medium (Q+T1)
air, oil, water
Tempering temperature (Q+T1)
680 to 740 deg C, min 2 h
Stress relief or tempering after bending or welding (Q+T2)
740 to 780 deg C
Quenching temperature (Q+T2)
1020 to 1070 deg C
Quenching medium (Q+T2)
air, oil, water
Tempering temperature (Q+T2)
640 to 700 deg C, min 2 h
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 20Cr12MoNiVH Listings on M-EX (For Sale)