1.4509
Data sheet material 1.4509 / AISI 441
X2CrTiNb18
Ferritic corrosion-resistant chromium steel
Brief description
In contrast to austenitic stainless steels, the material 1.4509 or AISI 441 has excellent resistance to stress corrosion cracking. This material is frequently used in the automotive industry.
Standards and nomenclature
| EN | |
|---|---|
| DIN | X2CrTiNb18 |
| AISI | 441 |
| US | S43940 |
| EN | |
|---|---|
| DIN | X2CrTiNb18 |
| AISI | 441 |
| US | S43940 |
Chemical composition
| C (carbon) | - | 0,03 |
| Mn (manganese) | - | 1,0 |
| Si (silicon) | - | 1,0 |
| P (phosphorus) | - | 0,040 |
| S (sulphur) | - | 0,015 |
| Cr (chromium) | 17,5 | 18,5 |
| Nb (niobium) | 3xC+0.3 | 1,0 |
| Ti (titanium) | 0,1 | 0,6 |
-
-
min.
max.
C
(carbon)
-
0,03
Mn
(Manganese)
-
1,0
Si
(Silicon)
-
1,0
P
(phosphorus)
-
0,040
S
(sulphur)
-
0,015
Cr
(chrome)
17,5
18,5
Nb
(niobium)
3xC+0.3
1,0
Ti
(Titanium)
0,1
0,6
General properties
| Corrosion resistance | |
|---|---|
| Mechanical properties | medium |
| Forgeability | good |
| Weldability | bad |
| Machinability | medium |
Special properties
Can be used up to 300°C
Not highly polishable due to titanium additive
Corrosion resistance
The higher chromium content of approx. 18% makes the material 1.4509 more corrosion-resistant than the material 1.4003 or comparable 131TP3 chromium steels. In natural environmental media (water, rural and urban environments), 1.4509 exhibits good corrosion resistance. As supplied, the material 1.4509 is resistant to intergranular corrosion. However, it is not resistant to seawater. (PREN = 16.0 - 18.0)
Mechanical properties
at 20°C
Hardness
HB
≤ 200
Yield point
Rp0,2
N / mm²
≥ 200
Tensile strength
Rm
N / mm²
420 - 620
Elongation
A5,65
≥ 18%
Modulus of elasticity
kN / mm²
220
Forgeability
During the forging process, the forging is first heated to approx. 1100°C - 1130°C. Forging takes place in a temperature range of 1130°C - 750°C.
Weldability
Gas containing hydrogen or nitrogen should be avoided, as should preheating or oscillation during welding. The welding energy should be reduced to a minimum and the workpiece should be free of oil and grease.
Machinability
This material grade tends to smear and form built-up edges due to its ferritic structure. Suitable cutting tools and adapted processing conditions should be selected.
Markets & Applications
Automotive industry (exhaust systems)
Plant engineering
Chemical and petrochemical industry
Mechanical engineering
Physical properties
at 20°C
Density
kg/dm³
7,7
Electrical
Resistance
(ohm) mm²/m
0,60
Magnetisability
available
Thermal conductivity
W/m K
25
Specific
Heat capacity
J/kg K
460
Processing
| Cold forming | |
|---|---|
| Cold heading | no |
| Polishability | no |
| Open-die and closed-die forging | Yes |
| Machining | Yes |
Thermal treatment
| Solution annealing (+AT) | |
|---|---|
| Hot forming | 1100 - 800°C (cooling: air) |
| Solution annealing (+AT) | |
|---|---|
| Hot forming | 1100 - 800°C (cooling: air) |
Frequently asked questions
Important note
TEAM EDELSTAHL operates purely as a trading company without technical staff. Consequently, we are not authorised to provide material consulting services.
The above values and information on the properties and/or usability of the material are purely informative. This information is based on the experience of the manufacturer and TEAM EDELSTAHL. All information is without guarantee. Misprints, errors and changes excepted.
