EN 1.4835 (253MA) is a heat-resistant austenitic stainless steel developed for high-temperature service where oxidation resistance, strength and long-term stability are essential. The grade is also known as UNS S30815 and X9CrNiSiNCe21-11-2. Its alloy design combines relatively high chromium and silicon with a nitrogen addition and a micro-alloyed rare earth element (Ce), which supports the formation of a stable and adherent oxide scale.
Compared to conventional heat-resistant stainless steels, 253MA is often selected when components are exposed to repeated thermal cycling and aggressive furnace atmospheres. In addition to oxidation resistance, the grade is valued for good high-temperature strength and improved resistance to carburization under certain service conditions. Final suitability depends on operating temperature, atmosphere (oxidizing / carburizing / mixed), mechanical stress and component design.
| Element | Typical range (wt. %) |
|---|---|
| C | 0.05 – 0.10 |
| Si | 1.4 – 2.0 |
| Mn | ≤ 0.8 |
| P | ≤ 0.04 |
| S | ≤ 0.03 |
| Cr | 20.0 – 22.0 |
| Ni | 10.0 – 12.0 |
| N | 0.14 – 0.20 |
| Ce | micro-alloyed (rare earth addition) |
| Fe | Balance |
| Property | Typical value (solution annealed) |
|---|---|
| Tensile strength (Rm) | ≥ 600 MPa |
| Yield strength (Rp0.2) | ≥ 310 MPa |
| Elongation (A5) | ≥ 40 % |
| Hardness | ≤ 230 HB |
| High-temperature strength | per standard / see EN 10204 3.1 certificate |
Exact values are stated on the material certificate EN 10204 / 3.1.
1.4835 / 253MA is supplied in multiple product forms for thermal processing applications. Typical supply forms include sheets/plates, round bars and seamless tubes. Material is usually delivered in solution annealed condition to support corrosion/oxidation resistance and toughness.
Round bars: dia 6 mm – dia 258 mm
Sheets / plates (hot rolled finish 1): thickness 2 mm – 50 mm
Seamless tubes: 3/8" Sch405 – 6" Sch405
Centerless grinding available on request. This is often specified for round bar used as shafts, pins and precision fixture components where tight tolerances and a consistent surface finish are required.
253MA combines high chromium and silicon with nitrogen and a rare earth micro-addition (Ce). This supports the formation of a stable oxide scale and improves resistance to oxidation in high-temperature environments. Nitrogen also contributes to strength, which is important for components exposed to heat and mechanical load.
253MA is commonly selected for high-temperature applications and is often referenced for service up to approximately 1100 °C in oxidizing atmospheres. Practical limits depend on the atmosphere (oxidizing vs. carburizing), thermal cycling, component thickness and mechanical stress. For critical designs, high-temperature strength and oxidation data should be evaluated.
The grade is designed to offer improved resistance to carburization compared to many conventional heat-resistant stainless steels. Actual performance depends strongly on the furnace atmosphere, carbon potential, temperature and exposure time. For harsh carburizing conditions, alloy selection should be reviewed case by case.
Yes, 1.4835 can be welded using appropriate stainless or high-temperature filler materials, depending on the design requirements. Good welding practice (controlled heat input, clean surfaces and correct filler selection) helps maintain oxidation resistance and avoids unnecessary distortion. Post-weld heat treatment is generally not required, but post-weld cleaning is recommended.
Typical supply includes sheets/plates, round bars and seamless tubes. Round bar is commonly used for machined fixture components, while plate and sheet are used for fabricated furnace parts. Seamless tubes are used where high-temperature tubular components are required.
Yes. Material is supplied with EN 10204 / 3.1 certification, confirming heat/lot traceability and documenting chemical analysis and mechanical test results for the delivered condition.
Certificates: EN 10204 / 3.1
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