Material 1.4835 – Heat-Resistant Stainless Steel for Demanding Applications
1.4835 stainless steel, also known as 253 MA or EN 1.4835 / X9CrNiSiNCe21-11-2, is an austenitic, heat-resistant chromium-nickel steel with high temperature strength and excellent oxidation resistance. Thanks to its elevated nitrogen content and the addition of rare earth elements (cerium), 1.4835 material offers outstanding performance in continuous service up to 1100 °C. It is ideal for use in industrial furnaces, petrochemical systems, and high-temperature components.
Physical Properties at 20 °C
- Density: 7.8 kg/dm³
- Electrical resistance: 0.85 Ω·mm²/m
- Thermal conductivity: 15 W/m·K
- Specific heat capacity: 500 J/kg·K
Typical Applications for 1.4835 Stainless Steel
This material is used in a wide range of thermally demanding industrial environments, including:
- High-temperature equipment and apparatus construction
- Chemical and petrochemical industries
- Furnace and heat treatment systems
- Power plant components
- Chain manufacturing
- Hardening shop accessories
- Soot blowers and other hot gas equipment
Chemical Composition of EN 1.4835 (253 MA)
The alloy is based on a chromium-nickel structure, stabilized by silicon, nitrogen, and cerium:
This balanced composition gives the 1.4835 stainless steel high temperature strength and excellent resistance to scaling in dry air.
| Value | Proportion % |
|---|---|
| Chromium (Cr): | 20.0 % – 22.0 % |
| Nickel (Ni): | 10.0 % – 12.0 % |
| Silicon (Si): | 1,4 % – 2.5 % |
| Carbon (C): | 0.05 % – 0.12 % |
| Manganese (Mn): | min. 0 % – max. 1.0 % |
| Phosphorus (P): | min. 0 % – max. 0.045 % |
| Sulfur (S): | min. 0 % – max. 0.015 % |
| Nitrogen (N): | 0.12 % – 0.20 % |
| Cerium (Ce): | 0.03 % – 0.08 % |
Mechanical Properties at Room Temperature (20 °C)
| Hardness (HB): | ≤ 210 |
| Yield strength Rp0.2: | ≥ 310 N/mm² |
| Tensile strength Rm: | 650 – 850 N/mm² |
| Elongation (A5.65): | ≥ 40 % |
| Elastic modulus: | approx. 200 kN/mm² |
Temperature Resistance of 1.4835
● Scaling resistance: up to approx. 1100 °C
● Recommended application temperature: up to 1150 °C
● Caution: Avoid prolonged exposure between 600 °C and 900 °C, as it can cause grain boundary embrittlement and reduced impact strength at room temperature.
Corrosion Resistance of 253 MA
● Good oxidation resistance in dry, air-rich environments
● Low resistance to sulfur-containing or reducing gases
Not recommended for carburizing or oxygen-deficient atmospheres at high temperatures
Is 1.4835 Stainless Steel Magnetic?
● No, it is non-magnetic due to its fully austenitic structure
● Even after forming or machining, the magnetic permeability remains low
Standards & Designations
● Material number: 1.4835
● EN standard: EN 1.4835 / X9CrNiSiNCe21-11-2
● AISI equivalent: 253 MA
● UNS designation: S30815
● Material group: Austenitic heat-resistant stainless steel
Welding and Machining of 1.4835
Can 1.4835 be welded?
● Yes, the material is weldable with all common welding processes
● Preheating or post-weld heat treatment is not necessary
● When welding multilayer seams, let the part cool to approx. 150 °C between passes
● Recommended filler metals:
○ AWS A5.9 ER 2553
○ EN ISO 14343: W 25 12 2 L
Machinability:
● Good machinability with appropriate tools
● Use low cutting speeds due to work hardening tendency
● Ensure efficient cooling and high-quality cutting tools
Thermal Treatment & Forging
● Hot forming: 1150 – 900 °C
● Solution annealing: 1020 – 1120 °C (cooling in water or air)
● Stress relieving: 900 °C for at least 30 minutes
Processing Capabilities
1.4835 material is suitable for:
● Cold forming
● Cold heading
● Polishing
● Open-die and drop forging
● Machining
