IS 6911:1992 X04Cr19Ni9 Steel: Specifications & Listings
IS 6911:1992 X04Cr19Ni9: Austenitic stainless steel X04Cr19Ni9 (numerical symbol 304 S1) to IS 6911:1992 (reaffirmed 1998), made as plate, sheet and strip and normally supplied solution annealed and descaled. Minimum tensile strength annealed is 400 MPa with 0.2% proof stress of 200 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
17.5-20.0
<=2.0
8.0-10.0
<=0.045
<=0.030
<=1.0
Mechanical Properties
Bend Test (180 deg)
Not required
Elongation (50 mm, annealed)
>=40%
Hardness (annealed, max)
192 HBS, 92 HRB
Tensile Strength (annealed)
>=400 MPa
Yield Strength (0.2% proof, annealed)
>=200 MPa
More data from IS 6911:1992
From the standard
Other composition limitsfrom Table 1 and its note
Steel type
Austenitic
Numerical symbol (ISS)
304 S1
Values
Maximum unless a range is given (ladle analysis)
Element not specified, Titanium, max
0.10
Element not specified, Niobium, max
0.20
Element not specified, Molybdenum, max
0.70
Element not specified, Copper, max
0.50
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
Softening (solution annealing), S
1 000 to 1 120
water or oil or air
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
Properties in work hardened conditionTable 6
0.2% proof stress, min (MPa)
Tensile strength, min (MPa)
Elongation, min (%)
Up to thickness (mm)
490
830
12
2.8
740
1 030
8
2.4
910
1 180
7
1.8
960
1 270
3
1.4
Cold rolled (work hardened) supply by agreement between purchaser and supplier (clause 10.5). Elongation on a gauge length of 5.65 times the square root of the cross section.