1.4547
Data sheet material 1.4547 / AISI 254SMO
X1CrNiMoCuN20-18-7
Austenitic corrosion-resistant stainless steel
Brief description
The material 1.4547 or 254SMO is an austenitic chromium-nickel-molybdenum steel with excellent resistance to pitting, crevice and surface corrosion. Due to its high PREN value, which is above a value of 42.2, material 1.4547 is resistant to seawater and is therefore frequently used in offshore technology.
Standards and nomenclature
| EN | |
|---|---|
| DIN | X1CrNiMoCuN20-18-7 |
| AISI | 254SMO |
| US | S31254 |
| EN | |
|---|---|
| DIN | X1CrNiMoCuN20-18-7 |
| AISI | 254SMO |
| US | S31254 |
Chemical composition
| C (carbon) | - | 0,02 |
| Mn (manganese) | - | 1,0 |
| Si (silicon) | - | 0,7 |
| P (phosphorus) | - | 0,030 |
| S (sulphur) | - | 0,010 |
| Cr (chromium) | 19,5 | 20,5 |
| Ni (nickel) | 17,5 | 18,5 |
| Mo (molybdenum) | 6,0 | 7,0 |
| N (nitrogen) | 0,18 | 0,25 |
| Cu (copper) | 0,5 | 1,0 |
-
-
min.
max.
C
(carbon)
-
0,02
Mn
(Manganese)
-
1,0
Si
(Silicon)
-
0,7
P
(phosphorus)
-
0,030
S
(sulphur)
-
0,010
-
-
min.
max.
Cr
(chrome)
19,5
20,5
Ni
(nickel)
17,5
18,5
Mo
(Molybdenum)
6,0
7,0
N
(Nitrogen)
0,18
0,25
Cu
(copper)
0,5
1,0
General properties
| Corrosion resistance | |
|---|---|
| Mechanical properties | good |
Corrosion resistance
The material 1.4547 is characterised by excellent corrosion resistance to pitting, crevice and surface corrosion. This material is also resistant to seawater. (PREN = 42.2 - 47.6)
Mechanical properties
at 20°C
Hardness
HB
≤ 215
Yield point
Rp0,2
N / mm²
≥ 200
Tensile strength
Rm
N / mm²
500 - 700
Elongation
A5,65
≥ 40%
Modulus of elasticity
kN / mm²
200
Weldability
The material 1.4547 / 254SMO can be welded using all standard welding processes. Care should be taken to minimise the heat input into the material.
Machinability
The material 1.4547 tends to work harden during machining. Therefore, a cutting depth should be selected at which the hardening zone is undercut. Furthermore, a low cutting speed should be selected.
Markets & Applications
Chemical and petrochemical industry
Food industry
Mechanical engineering
Seawater desalination
Offshore
Flue gas desulphurisation
Shipbuilding
Physical properties
at 20°C
Density
kg/dm³
8,0
Electrical
Resistance
(ohm) mm²/m
0,85
Thermal conductivity
W/m K
13
Specific
Heat capacity
J/kg K
500
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.
