IS 6911:1992 X108Cr17Mo Steel: Specifications & Listings
IS 6911:1992 X108Cr17Mo: Martensitic stainless steel X108Cr17Mo (numerical symbol 440) to IS 6911:1992 (reaffirmed 1998), made as plate, sheet and strip and normally supplied annealed and descaled. Hardness is 285 HBS maximum annealed and at least 58 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
Mo
Ni
P
S
Si
0.95-1.20
16.0-18.0
<=1.0
<=0.75
<=0.50
<=0.045
<=0.030
<=1.0
Mechanical Properties
Hardness (annealed, max)
285 HBS
Hardness (quenched and tempered, min)
660 HV, 58 HRC
More data from IS 6911:1992
From the standard
Other composition limitsfrom Table 1 and its note
Steel type
Martensitic
Numerical symbol (ISS)
440
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
780 to 880
furnace
Hardening (Q + T)
1 000 to 1 030
not stated
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
285 HBS
Quenched and tempered, min
660 HV, 58 HRC
Indicative values for cutlery use after suitable heat treatment (clause 10.4).
Source: IS 6911:1992, Table 5
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