1.4305
Data sheet material 1.4305 / AISI 303
X8CrNiS18-9
Austenitic corrosion-resistant stainless steel
Brief description
The material 1.4305 or AISI 303 is the classic austenitic steel for machining and is therefore colloquially referred to as „free-cutting steel“. The addition of sulphur has a strongly positive effect on the machining properties, but has a negative impact on corrosion resistance and weldability.
Standards and nomenclature
| EN | |
|---|---|
| DIN | X8CrNiS18-9 |
| AISI | 303 |
| US | S30300 |
| EN | |
|---|---|
| DIN | X8CrNiS18-9 |
| AISI | 303 |
| US | S30300 |
Chemical composition
| C (carbon) | - | 0,1 |
| Mn (manganese) | - | 2,0 |
| Si (silicon) | - | 1,0 |
| P (phosphorus) | - | 0,045 |
| S (sulphur) | 0,15 | 0,35 |
| Cr (chromium) | 17,0 | 19,0 |
| Ni (nickel) | 8,0 | 10,0 |
| N (nitrogen) | - | 0,1 |
| Cu (copper) | - | 1,0 |
-
-
min.
max.
C
(carbon)
-
0,1
Mn
(Manganese)
-
2,0
Si
(Silicon)
-
1,0
P
(phosphorus)
-
0,045
S
(sulphur)
0,15
0,35
Cr
(chrome)
17,0
19,0
Ni
(nickel)
8,0
10,0
N
(Nitrogen)
-
0,1
Cu
(copper)
-
1,0
General properties
| Corrosion resistance | |
|---|---|
| Mechanical properties | medium |
| Forgeability | bad |
| Weldability | bad |
| Machinability | excellent |
Special properties
Outstanding machining properties
Can be used up to 400°C
Corrosion resistance
The addition of sulphur limits the corrosion resistance in acidic and chloride-containing media. The material 1.4305 is not resistant to intergranular corrosion. (PREN = 17.0 - 20.7; the PREN formula does not take into account the damaging influence of nitrogen and should therefore be viewed with scepticism)
Mechanical properties
at 20°C
Hardness
HB
≤ 230
Yield point
Rp0,2
N / mm²
≥ 190
Tensile strength
Rm
N / mm²
500 - 750
Elongation
A5,65
≥ 35%
Modulus of elasticity
kN / mm²
200
Forgeability
Due to the risk of overheating and the simultaneous need for high forging temperatures, the material 1.4305 is difficult to forge. Forging takes place in a temperature range of 1150°C - 950°C during the forging process. This is followed by air cooling. There is a risk of hot cracks forming during forging.
Weldability
The addition of sulphur severely restricts the welding properties. There is also a risk of hot cracks forming during welding.
Machinability
Due to the addition of sulphur, short-breaking chips are formed during machining, which is why the material 1.4305 is particularly suitable for automatic machining. Sufficient cooling should be ensured to prevent overheating during machining.
Markets & Applications
Automotive industry
Valve industry
Apparatus and vessel construction
Construction industry
Chemical and petrochemical industry
Food processing industry
Mechanical engineering
Physical properties
at 20°C
Density
kg/dm³
7,9
Electrical
Resistance
(ohm) mm²/m
0,73
Magnetisability
Very low
Thermal conductivity
W/m K
15
Specific
Heat capacity
J/kg K
500
Processing
| Cold forming | |
|---|---|
| Cold heading | rare |
| Polishability | no |
| Open-die and closed-die forging | rare |
| Machining | Yes |
Thermal treatment
| Solution annealing (+AT) | |
|---|---|
| Hot forming | 1200 - 900°C (cooling: air) |
| Solution annealing | |
|---|---|
| Hot forming | 1200 - 900°C (cooling: air) |
Frequently asked questions
Important note
TEAM EDELSTAHL operates purely as a trading company without technical staff. As a result, we cannot and must not provide materials consulting.
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.
