AISI 305 | 1.4303 | BS 305S19 | X4CrNi18-12 | Austenitic stainless steel
Data sheet according to DIN EN 10088-3 for material number AISI 305 / 1.4303
The austenitic stainless steel AISI 305 is also known under the designations 1.4303, BS 305S19 and X4CrNi18-12. Due to the higher nickel content of 11-13%, the material has good corrosion resistance (PREN value 18.0 to 20.7) in natural environmental media such as water or in humid air. This material is not resistant to chlorine, salt and seawater. The stainless steel 1.4303 has a tensile strength of 500 to 700 N/mm², a hardness of ≤ 215 HB and a density of 7.90 kg/dm³ (at 20°C). It can be used at temperatures of up to 600°C and is also suitable for use at low temperatures. The material is very easy to weld and forge, but it has only a low level of machinability. Stainless steel AISI 305 / 305S19 is a non-magnetic steel (μr ≤ 1.3) and is therefore neither magnetic nor magnetisable. The material is characterised by good polishability and cold formability. It is therefore ideally suited for cold forming, cold heading and machining.
Specifications of the material
EN-grade 1.4303
EN-short name X4CrNi18-12
EN-standard 10088-3
Microstructure austenite
Comparable standards and designations
AFNOR Z1CN18-12 & Z5CN18-11FF
AISI 305 / AISI 308
Alloy 305
AMS 5685
BS 305S19
JIS SUS305J1
RVS 305
SAE 305
UNS S30500
Properties and chemical composition of stainless steel AISI 305 / 1.4303
C | Si | Mn | P | S | N | Cr | Cu | Mo | Ni | Ti |
|---|---|---|---|---|---|---|---|---|---|---|
≤ 0,06 | ≤ 1,00 | ≤ 2,00 | ≤ 0,045 | ≤ 0,03 | ≤ 0,10 | 17,0 - 19,0 | - | - | 11,0 - 13,0 | - |
Mass fraction in % according to DIN EN 10088-3
Abbreviations: C = carbon, Cr = chromium, Cu = copper, Mn = manganese, Mo = molybdenum, N = nitrogen, Ni = nickel, P = phosphorus, S = sulphur, Si = silicon, Ti = thallium.
Physical properties
Magnetizability: No
Density (kg/dm³): 7,9
Thermal conductivity (up to 20°C): 15
Electronic resistance at room temperature (in Ω mm²/m): 0,73
Mechanical properties
The values given refer to the diameter range ≤ 160 (Ø in mm) and 160 < d ≤ 250 (Ø in mm)*
Hardness in HB: ≤ 215
Yield strength Rp0.2 in Mpa: ≥ 190
Yield strength Rp1.0 in Mpa: ≥ 225
Strength / tensile strength Rm in Mpa: 500-700
Elongation at break A in % (longitudinal) at ≤ 160: 45
* These figures refer to mechanical properties at room temperature in the solution-annealed state (according to EN 10088-3)
Yield strengths at elevated temperature in the solution-annealed condition
Temp in °C | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 |
|---|---|---|---|---|---|---|---|---|---|---|
Rp1,0 in Mpa | 190 | 170 | 155 | 145 | 135 | 129 | 125 | 122 | 120 | 120 |
Rp0,2 in Mpa | 155 | 140 | 127 | 118 | 110 | 104 | 98 | 95 | 92 | 90 |
Stainless steel AISI 305 (1.4303 / X4CrNi18-12) has excellent weldability. The material can be used with most common welding methods such as arc welding or TIG welding. However, this stainless steel grade is only suitable for gas fusion welding and submerged arc welding to a limited extent. A welding filler is not required. If an additive is to be used, the material AISI 308L (1.4316) is suitable for this. The corrosion resistance is negatively affected by the discolouration that occurs during welding, so this should be removed.
Forging
The stainless steel AISI 305 / 305S19 has very good forging properties. The material should first be heated slowly to a temperature of 1150°C to 1200°C. Forging can then take place in the temperature range between 750°C and 1150°C. Subsequent cooling can take place in air or in water. The material is suitable for freehand forging and joint forging.
Heat treatment and hot forming
Solution heat treatment (cooling by air or water): 1000-1100 °C
Hot forming (cooling by air): 1200-900 °C
Corrosion resistance
Stainless steel AISI 305 (1.4303 / X4CrNi18-12) has good corrosion resistance (PREN value 18.0 to 20.7) in natural environmental media without chlorine and salt content (e.g. water and steam). This stainless steel is also resistant to weak acids at low temperatures. The material is not resistant to salt and seawater and should not be used in heavily chlorinated media such as swimming pools
Applications of stainless steel AISI 305 / 1.4303
The material AISI 305 (1.4303 / X4CrNi18-12) is used in various industrial sectors. For example, pipes for pipelines are produced from this austenitic stainless steel for the chemical and petroleum industries. Fittings, stainless steel screws and pins (e.g. grooved pins) are also made from this material. In architecture, AISI 305 / 305S19 stainless steel is used for railings and balcony elements. In mechanical engineering, machine parts are made from this stainless steel. This stainless steel is also used in the construction industry and the automotive industry.
The data provided in this data sheet or material information sheet has been compiled to the best of our knowledge and is based on the current version of the relevant standard. We do not accept any liability for any errors.
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