253MA round bar (UNS S30815 / 1.4835 / X9CrNiSiNCe21-11-2) is a heat-resistant austenitic stainless steel rod engineered for high-temperature service. Its rare-earth and nitrogen micro-alloyed composition delivers excellent oxidation resistance, creep strength, and thermal stability, making it a reliable choice for demanding industrial environments.

• Excellent oxidation resistance at elevated temperatures
• High creep strength and structural stability under thermal load
• Good resistance to cyclic temperature fluctuations
• Nitrogen and rare-earth alloying for enhanced high-temperature durability
• Suitable for continuous service in aggressive thermal environments

• Furnace components and heat treatment equipment
• Kiln and incinerator internals
• Petrochemical and refining high-temperature assemblies
• Exhaust and flue gas handling systems
• Industrial burner and combustion components

253MA Round Bar

UNS S30815｜W.Nr. 1.4835｜EN: X9CrNiSiNCe21‑11‑2 Nickel‑saving heat‑resistant austenitic stainless steel; main standards: ASTM A276 / A479, EN 10088‑3; supply condition: solution annealed; forms: hot rolled, forged, peeled, bright turned & ground; MTR with EN 10204 3.1 / 3.1B; PMI, UT, MT available on requestAlleima

Chemical Composition (wt.%)

Rare earth cerium + nitrogen + silicon give outstanding cyclic oxidation resistance, superior to 309 / 309Si2 and close to many 310S parts with lower nickel costAlleima

Mechanical Properties (solution annealed, room temperature)

Max continuous service temperature: 1150 °C, excellent creep strength and anti‑carburization; good resistance to thermal cycling; not suitable for wet chloride corrosion serviceAlleima

Supply Size & Surface

• Diameter: 6 mm – 350 mm; forged bar up to larger sizes
• Finish: hot rolled black, peeled, bright turned, centerless ground
• Cutting: fixed length cut, machining allowance available
• HS Code: 7222200000 (stainless steel round bar, verify with local customs)

Heat Treatment

• Solution annealing: 1050–1100 °C, rapid air or water quench
• Avoid long holding between 600–900 °C, sigma phase and intermetallic precipitation degrade ductility and high‑temperature performance
• Hot forging: 950–1200 °C; re‑solution treatment is recommended after hot working for critical high‑temp components

Welding

• Preferred: GTAW / TIG, GMAW
• Matching filler: ER253MA / 1.4835 filler
• Control heat input; for long‑term high‑temperature duty, post‑weld solution annealing is recommended
• Oxy‑acetylene welding is not advised

Applications

• Petrochemical: ethylene cracker hangers, flare tips, burner parts, reformer internals
• Furnace industry: furnace roller shafts, annealing baskets, heat shields, radiant tube supports
• Waste & power: incinerator components, fluidized bed boiler parts, FGD high‑temperature fixtures
• Heat treatment: fixture shafts, conveyor rollers, high‑temperature fasteners
• Cement & metallurgy: kiln internals, recuperator structural bars