IS 6911:1992 X12Cr12 Steel: Specifications & Listings
IS 6911:1992 X12Cr12: Martensitic stainless steel X12Cr12 (numerical symbol 410) to IS 6911:1992 (reaffirmed 1998), made as plate, sheet and strip and normally supplied annealed and descaled. Minimum tensile strength annealed is 590 MPa with 0.2% proof stress of 410 MPa.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Cr
Mn
Ni
P
S
Si
0.08-0.15
11.5-13.5
<=1.0
<=1.0
<=0.040
<=0.030
<=1.0
Mechanical Properties
Elongation (50 mm, annealed)
>=16%
Hardness (annealed, max)
212 HBS, 95 HRB
Tensile Strength (annealed)
>=590 MPa
Yield Strength (0.2% proof, annealed)
>=410 MPa
More data from IS 6911:1992
From the standard
Other composition limitsfrom Table 1 and its note
Steel type
Martensitic
Numerical symbol (ISS)
410
Values
Maximum unless a range is given (ladle analysis)
Element not specified, Molybdenum, max
0.30
Element not specified, Copper, max
0.30
Elements not listed in Table 1 are not added to the steel except to finish the heat, and then only within the limits shown.
Source: IS 6911:1992, Table 1 and its note
Recommended heat treatmentTable 3
Treatment
Temperature (deg C)
Cooling medium
Annealing, A1
700 to 780
air
Annealing, A2
770 to 870
furnace
Hardening (Q + T, for the Table 4 properties)
950 to 1 000
oil or air
Tempering
700 to 750
-
Recommended heat treatment (clause 8.3). Austenitic steels are supplied solution annealed and descaled; ferritic and martensitic steels annealed and descaled, unless agreed otherwise.
Source: IS 6911:1992, Table 3
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