253MA Stainless Steel, also designated as EN 1.4835, X9CrNiSiNCe21-11-2, UNS S30815, and SS 2368, is a premium austenitic heat and creep-resistant chromium-nickel stainless steel. Engineered with optimized silicon and cerium micro-alloying elements, this grade delivers outstanding high-temperature stability and oxidation resistance, making it far superior to conventional 310S and 309 heat-resistant steels in cyclic thermal service environments. As a professional China high-temperature stainless steel supplier, ZYTC Alloy provides full-specification certified 253MA (1.4835) products with stable chemical composition, precise dimensional tolerance and consistent high-temperature mechanical properties. We strictly follow European EN and American UNS industrial standards to supply qualified heat-resistant stainless steel materials for global thermal energy, metallurgy, chemical and industrial furnace manufacturing projects.
Available Product Forms – 253MA (1.4835 / UNS S30815)ZYTC Alloy supplies 253MA in a comprehensive range of forms: | Product Form | Availability |
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| Sheet / Plate | Available | | Strip / Coil | Available | | Bar | Available | | Wire | Available | | Seamless Tube / Pipe | Available | | Welded Tube / Pipe | Available | | Fittings | Available | | Forged / Cast Parts | Available on request | | Finished Parts | Available to customer drawings |
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Specifications – 253MA (1.4835 / UNS S30815)| Material No. | EN Designation | UNS | Alloy | JIS | | 1.4835 | X9CrNisiNCe21-11-2 | S30815 | 253 MA | SUS304 (equivalent applications) |
Chemical Composition| Element | Content (Wt%) |
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| Carbon (C) | 0.05 – 0.10 | | Chromium (Cr) | 20.0 – 22.0 | | Nickel (Ni) | 10.0 – 12.0 | | Silicon (Si) | 1.4 – 2.0 | | Nitrogen (N) | 0.14 – 0.20 | | Cerium (Ce) | 0.03 – 0.08 |
Physical & Mechanical Properties| Property | Metric | Imperial |
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| Density | 7.80 g/cm³ | — | | Modulus of Elasticity (20°C) | 200 GPa | 29.0 × 10⁶ psi | | Thermal Conductivity (20°C) | 15.0 W/m·K | — | | Coefficient of Expansion (20-100°C) | 17.0 µm/m·°C | 9.4 µin/in·°F |
Mechanical Properties (Room Temperature – Annealed):| Property | Metric | Imperial |
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| Tensile Strength (min.) | 600 – 650 MPa | 87 – 94 ksi | | Yield Strength (0.2% offset, min.) | 310 MPa | 45 ksi | | Elongation (min.) | 40% | 40% | | Hardness (max.) | 217 HB / 95 HRB | — |
Core Advantages & Operating ConditionsHigh-Temperature Oxidation Resistance:
253MA's high silicon and cerium content promotes the formation of a highly adherent oxide layer that resists spalling during thermal cycling . The alloy can be used up to 1150°C (2100°F) in air, with excellent resistance to isothermal and cyclic oxidation. Creep Strength:
253MA offers superior creep strength compared to standard 18/8 steels and 309S grades, making it suitable for load-bearing applications at elevated temperatures where creep is the design-limiting factor. At 600°C, the 1% creep strength at 100,000 hours is 70 MPa; at 800°C, it is 11 MPa. Carburization Resistance:
The protective oxide scale provides good resistance to carburization in carbon-rich atmospheres . In alternately oxidizing and carburizing environments, the grade performs well, though caution is advised in low-oxygen atmospheres containing ammonia. Cyclic Oxidation Performance:
Thanks to the rare earth metal (cerium) addition, 253MA demonstrates superior resistance to cyclic oxidation compared to TP310 and 309S steels under severe thermal cycling conditions.
ApplicationsMetallurgical Industry: Sintering equipment, blast furnace parts, steel melting furnaces, continuous casting hardware Heat Treatment Furnaces: Radiant tubes, thermocouple protection tubes, burner components, retorts, conveyor belts, fans, jigs and baskets Petrochemical: Styrene reactor tubes, EDC cracking pipes, convection tubes in ethylene cracking, tube hangers Power Generation: Fluid bed combustion plant piping, waste heat recovery systems Cement & Glass Industries: Kiln components, air pre-heater tubes in sulfuric acid gas converters General High-Temperature: Boiler nozzles, cyclone separators, corrugated boxes, non-pressure parts up to 1150°C
Contact UsRequest a quote for 1.4835 / 253MA Austenitic Stainless Steel (UNS S30815 / X9CrNiSiNCe21-11-2) – High-Temperature Alloy – Excellent Creep & Oxidation Resistance – Up to 1150°C. Please provide: 📧 Email: daisy@zytcsteel.com
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