What material is 1.4845 equivalent to?

1.4845 Stainless Steel: A High - Performance Material for Extreme High - Temperature Environments

 

1. Material Overview: A European EN - Standard Austenitic Heat - Resistant Stainless Steel

1.4845, also known as X8CrNi25 - 21, is an austenitic heat - resistant stainless steel under the European EN standard. It corresponds to the American UNS S31008 and the Chinese 06Cr25Ni20 (0Cr25Ni20). With an extremely high chromium and nickel content (Cr 24 - 26%, Ni 19 - 22%), it has established itself as a benchmark material in the high - temperature industrial sector, particularly suitable for extreme working conditions above 1000°C.

 

 

Key Standards:

German Standard: DIN EN 10095 - 1999

Distinctive Features: High resistance to high - temperature oxidation, carburization, and sulfidation, along with high - strength retention

 

2. Chemical Composition

Element	Content (%)
C	≤0.10
Cr	24.00 - 26.00
Ni	19.00 - 22.00
S	≤0.015
N	≤0.11

 

3. Mechanical and Physical Properties

Performance Indicator	Value	Comparative Advantage
Tensile Strength	≥520 MPa	Maintains 200 MPa at 1000°C, which is 4 times that of 304 stainless steel
Elongation	≥40%	Excellent ductility allows it to adapt to complex thermal deformations
Density	7.98 g/cm³	The same as 310S, and it is lighter than nickel - based alloys
Thermal Conductivity	14.2 W/(m·K) (at 100°C)	Fast heat response, making it ideal for high - efficiency heat - exchange equipment
Resistivity	0.78 μΩ·m (at 20°C)	A perfect choice for electric heating elements

 

4. Core Material Characteristics: Why It's a Benchmark in Extreme High - Temperature Fields

‌1.4845 stainless steel Ultimate Heat Resistance

Continuous Operating Temperature: 1150°C (in an oxidizing atmosphere)

Short - Term Peak Temperature: 1250°C (for less than 50 hours)

Thermal Shock Resistance: Can withstand rapid heating and cooling at a rate of 300°C/min, outperforming traditional heat - resistant steels.

 

‌1.4845 stainless steel Special Corrosion Resistance

Carburization Resistance: Has a longer service life than Alloy 800H in a CH₄/H₂ atmosphere.

Sulfidation Resistance: Lasts twice as long as 309S in flue gas containing SO₂.

Molten Salt Corrosion Resistance: Shows excellent resistance to Na₂SO₄ - V₂O₄ mixed salts.

 

‌1.4845 stainless steel Process Characteristics

Welding: Requires the use of W.Nr.1.4845 welding materials (AWS A5.9 ER310), and the weld strength is at least 90% of the base material.

Hot Forming: The optimal forging range is 900 - 1180°C to avoid grain coarsening.

Machining: TiAlN - coated tools are recommended to reduce cutting resistance.

5. Typical Industrial Applications: The Core Choice in High - Value Scenarios

Energy and Power Industry

Ultra - Supercritical Boilers: Tube supports for high - temperature superheaters can operate for over 100,000 hours under conditions of 650°C and 30 MPa.

Nuclear Power Equipment: Secondary - side components of steam generators can withstand radioactive media and high - temperature and high - pressure environments.

Petrochemical Field

Ethylene Pyrolysis Furnaces: Tube sheets of quenching heat exchangers maintain carburization resistance in pyrolysis gas at 1050°C.

Hydrogen Production Units: Headers of reformer furnaces can resist corrosion from H₂/CO mixed gases.

Aerospace Industry

Gas Turbine Components: Combustion chamber liners can operate stably in 1100°C gas for more than 5000 hours.