1.4509 Datasheet
X2CrTiNb18
stainless steel; corrosion resistant steel; ferrite
The material 1.4509 is a ferritic chromium steel with good corrosion resistance and medium mechanical properties. In contrast to the austenitic stainless steels, this grade has excellent resistance to stress corrosion cracking, which is why it is mainly used in exhaust systems.
Composition
C
Si
Mn
P
S
Cr
Nb
Ti
min.
-
-
-
-
-
17,5
(3xC)+0,30
0,1
max.
0,03
1
1
0,04
0,015
18,5
1
0,6
C
max.
0,03
Si
max.
1
Mn
max.
1
P
max.
0,04
S
max.
0,015
Cr
min.
17,5
max.
18,5
Nb
min.
(3xC)+0,30
max.
1
Ti
min.
0,1
max.
0,6
Standards and designations
Material group
Stainless steel
AFNOR
Z3CTNb18
AISI/SAE
441
B.S.
X2CrTiNb18
UNS
S43940
Fields of application
Automotive industry
Catalysts & Exhaust Systems
Mechanical engineering
Plant engineering
Chemistry, petrochemistry
Apparatus and tank construction
Attributes
Physical properties at 20° C
Density
7,70 kg/dm³
Specific heat
460 J/kg K
Thermal conductivity
25 W/m K
Electrical resistance
0,60 (ohm) mm²/m
Magnetizability
available
Thermal treatment
Hot forming
800 - 1100 °C
Solution annealing
750 - 850 °C
More properties
good corrosion resistance
good chemical resistance
good forgeability
medium mechanical properties
medium weldability
Delivery forms
Profile tube
Round
Round tube/bushing
Sheets/sheet blanks/plates
Slit strip
