AISI 314 | 1.4841 | 314S25 | X15CrNiSi25-21 | Austenitic stainless steel
Data sheet according to DIN EN 10095 for material number AISI 314 / 1.4841
AISI 314, also known as 1.4841, BS 314S25 or X15CrNiSi25-21, is an austenitic stainless steel that is highly resistant to heat and retains its strength at high temperatures. These properties mean that it is regularly used in furnace construction or in connection with high temperatures, for example in apparatus engineering or in the petrochemical industry. The silicon content of 1.50 to 2.00% ensures a scaling resistance of 1150°C in air. Stainless steel 1.4841 has a tensile strength of 550 to 750 N/mm², a hardness of ≤ 223 HB and a density of 7.9 kg/dm³ (at 20°C). In most media, this stainless steel has good corrosion resistance (PREN value 24.0 to 29.3). It is not magnetisable, but the material can be slightly magnetic in the cold-formed state. The material has good welding and forging properties and can be used for cold heading and cold forming. Since carbides can form during machining, it has only a medium machinability.
Specifications of the material
EN-grade 1.4841
EN-short name X15CrNiSi25-21
EN-standard 10095
Microstructure austenite
Comparable standards and designations
AFNOR Z15CNS25-20
AISI 314
BS 314S25
JIS SUH310
PN H25N20S2
UNS S31400
Chemical composition and properties of stainless steel AISI 314 / 1.4841
C | Si | Mn | P | S | N | Cr | Cu | Mo | Ni | Ti |
|---|---|---|---|---|---|---|---|---|---|---|
≤ 0,20 | 1,50 – 2,00 | ≤ 2,00 | ≤ 0,045 | ≤ 0,015 | ≤ 0,11 | 24,0 – 26,0 | - | - | 19,0 – 22,0 | - |
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 = titanium
Physical properties
Magnetizability: non
Density (kg/dm³): 7,9
Thermal conductivity (up to 20°C): 15
Electronic resistance at room temperature (in Ω mm²/m): 0,9
Mechanical properties
The values given refer to the diameter range ≤ 160 (Ø in mm)*
Hardness in HB: ≤ 223
Yield strength Rp0.2 in Mpa: ≥ 230
Yield strength Rp1.0 in Mpa: ≥ 270
Elongation at fracture A5 in % (longitudinal) ≥ 30
Elongation at break A5 in % (transverse) -
Tensile strength / strength Rm in Mpa: 550 - 750
Notched impact J (%) (longitudinal): -
* These figures refer to mechanical properties at room temperature in the solution-annealed state (according to EN 10095)
AISI 314 stainless steel (1.4841 / X15CrNiSi25-21) is suitable for all common welding processes. These include TIG welding, MAG welding, submerged-arc welding, laser beam welding and arc welding. As a rule, no preheating is required, but hot cracks can occur with this stainless steel. To avoid this, the maximum welding energy should be limited. The material 1.4842 (X12CrNi25-20) can be used as a welding additive. Heat treatment after welding is not necessary.
Please note that the corrosion resistance is affected by welding and that the material is susceptible to intergranular corrosion in the welded state.
Forgeability
AISI 314 has good forging properties and can be forged in the temperature range from 1175°C to 1000°C. After forging, rapid cooling in air or water should be carried out. This stainless steel is resistant to scaling up to 1150°C. To avoid sigma-phase embrittlement, the material should not be processed in the temperature range between 600°C and 900°C. Open-die and drop forging is possible
Heat treatment and hot forming
Solution heat treatment (cooling by air or water): 1050-1150 °C
Hot forming (cooling by air): 1150-800 °C
Machinability
AISI 314 stainless steel has medium machinability, as carbides can form during processing. This leads to increased wear of the cutting tools. Due to the low thermal conductivity and the tendency to cold hardening, a low cutting depth and a low cutting speed should be observed during machining. In addition, sufficient cooling is required.
Corrosion resistance
AISI 314 stainless steel has a PREN value of 24.0 to 29.3 and is highly corrosion resistant in most media. However, it is only resistant to oxidising and reducing sulphurous gases up to a temperature of approx. 650 °C. It has a medium resistance to corrosion up to approx. 900 °C against nitrogenous, carburising and low-oxygen gases.
Application area of stainless steel AISI 314 / 1.4841
Stainless steel AISI 314 (1.4841 / X15CrNiSi25-21) is a versatile material that is used in a range of different industries. Due to its heat resistance, this stainless steel is often used in furnace construction, e.g. for steam boilers, combustion chamber covers and furnace linings, as well as for heating pipes in thermal engineering systems. In the construction industry, stainless steel 1.4841 is used for facades and other building elements. This material is also used in the oil industry, for example in the extraction, storage and processing of oil and gas.
In mechanical engineering, this stainless steel is used to manufacture components such as gear parts. Other industries that use this material include the automotive and food industries, apparatus and container construction, the cement industry, and the chemical and petrochemical industries.
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Please note
The information given in this data sheet has been compiled to the best of our knowledge and is based on the current version of the relevant standard. It is considered for reference only and we assume no liability for any errors.
