IS 1570 (Part 7):1992 3Cr17Ni12Mo3H Steel: Specifications & Listings
IS 1570 (Part 7):1992 3Cr17Ni12Mo3H: 3Cr17Ni12Mo3H: steel for elevated temperature service (creep resisting steel). Specified in IS 1570 (Part 7):1992.
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
<=0.030
<=1.00
<=2.00
<=0.045
<=0.030
16.00-18.00
10.00-14.00
2.00-3.00
Mechanical Properties
Tensile Strength
490-690 MPa
Yield Strength
>=185 MPa (0.2 % proof stress)
Elongation
>=30%
Condition
Tubes, plates, Q, thickness - (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
Tubes, plates
Q
-
-
185
490
690
30
-
-
Tubes, plates
Q
over 3 to 40
-
185
440
640
45
-
-
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
Heat treatment2 entries
Quenching temperature (Q)
850 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
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