1.4742
Data sheet material 1.4742 / AISI 442
X10CrAlSi18
Ferritic heat-resistant chrome steel
Brief description
The material 1.4742 or Sicromal 10 is a heat-resistant ferritic chromium steel with excellent resistance to sulphur-containing gases. Due to its increased chromium content, it is more resistant to scaling than the material 1.4724. The material 1.4742 is scale-resistant up to approx. 1000°C and is therefore used in high-temperature applications such as furnace construction.
Standards and nomenclature
| EN | |
|---|---|
| DIN | X10CrAlSi18 |
| AISI | 442 |
| US | Sicromal 10 |
| EN | |
|---|---|
| DIN | X10CrAlSi18 |
| AISI | 442 |
| US | Sicromal 10 |
Chemical composition
| C (carbon) | - | 0,12 |
| Mn (manganese) | - | 1,0 |
| Si (silicon) | 0,7 | 1,4 |
| P (phosphorus) | - | 0,040 |
| S (sulphur) | - | 0,015 |
| Cr (chromium) | 17,0 | 19,0 |
| Al (aluminium) | 0,7 | 1,2 |
-
-
min.
max.
C
(carbon)
-
0,12
Mn
(Manganese)
-
1,0
Si
(Silicon)
0,7
1,4
P
(phosphorus)
-
0,040
S
(sulphur)
-
0,015
Cr
(chrome)
17,0
19,0
Al
(aluminium)
0,7
1,2
General properties
| Corrosion resistance | |
|---|---|
| Mechanical properties | medium |
| Forgeability | good |
| Weldability | conditional |
| Machinability | medium |
Special properties
Heat resistant
Scale resistant up to 1000°C in air
Corrosion resistance
The material 1.4742 is scale-resistant from 800°C - 1000°C. This material is also resistant to oxidising sulphur-containing gases and sulphur-containing reducing gases. This grade has medium resistance to carburising and low-oxygen gases.
Mechanical properties
at 20°C
Hardness
HB
≤ 212
Yield point
Rp0,2
N / mm²
≥ 270
Tensile strength
Rm
N / mm²
500 - 700
Elongation
A5,65
≥ 15%
Modulus of elasticity
kN / mm²
200
Forgeability
Forging takes place in a temperature range of approx. 1150°C - 800°C. This is followed by rapid air or water cooling.
Weldability
The material 1.4742 can be welded using all standard welding processes. The workpiece should be preheated to approx. 200°C - 300°C. To avoid coarse grain formation, a low energy density should be selected. If an austenitic filler metal is used, the austenitic weld bead must be covered with a ferritic bead if the finished part is to be used in a sulphurous, carburising environment. After welding, stress relief annealing at 650°C - 800°C is recommended.
Machinability
During machining, the material 1.4742 tends to smear due to its ferritic structure. Suitable cutting tools and adapted machining conditions should be selected.
Markets & Applications
Equipment engineering for high-temperature applications
High-temperature conveyor systems
Chain industry
Mechanical engineering
Industrial furnace construction
Flue gas desulphurisation
Cement industry
Physical properties
at 20°C
Density
kg/dm³
7,7
Electrical
Resistance
(ohm) mm²/m
0,93
Magnetisability
available
Thermal conductivity
W/m K
19
Specific
Heat capacity
J/kg K
500
Processing
| Cold forming | |
|---|---|
| Cold heading | not usual |
| Open-die and closed-die forging | Yes |
| Machining | rare |
Our
Delivery programme
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.
