IS 6911:1992 X40Cr13 Steel: Specifications & Listings
IS 6911:1992 X40Cr13: Martensitic stainless steel X40Cr13 (numerical symbol 420 S3) to IS 6911:1992 (reaffirmed 1998), made as plate, sheet and strip and normally supplied annealed and descaled. Hardness is 255 HBS maximum annealed and at least 50 HRC quenched and tempered.
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
0.35-0.45
12.0-14.0
<=1.0
<=1.0
<=0.040
<=0.030
<=1.0
Mechanical Properties
Hardness (annealed, max)
255 HBS
Hardness (quenched and tempered, min)
515 HV, 50 HRC
More data from IS 6911:1992
From the standard
Other composition limitsfrom Table 1 and its note
Steel type
Martensitic
Numerical symbol (ISS)
420 S3
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, A
770 to 870
furnace
Hardening (Q + T)
1 000 to 1 050
oil or air
Tempering
100 to 250
-
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
Hardness for cutlery steelsTable 5
Annealed, max
255 HBS
Quenched and tempered, min
515 HV, 50 HRC
Indicative values for cutlery use after suitable heat treatment (clause 10.4).
Source: IS 6911:1992, Table 5
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