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Accueil " Matériaux " Austenitic Stainless Steel 253 MA | 1.4835 | UNS S30815

Austenitic Stainless Steel 253 MA | 1.4835 | UNS S30815

    253 MA stainless steel is a nickel-saving heat-resistant steel with high creep strength and oxidation resistance up to 1150°C(2102℉).It combines excellent corrosion resistance with favorable machinability.Suitable for tuyaux en acier inoxydable et raccords in chemical,petroleum,and high-temperature environments.

    253 MA Standards

    Nom de l'alliageMaterial No.EN DesignationUNSChine GB
    253MA1.4835X9CrNiSiNCe21-11-2S308151Cr25Ni20Si2

    Ce que nous faisons

    • Plaque
    • Feuille
    • Forgeage
    • Barre ronde
    • Bride
    • Tuyaux
    • Raccords
    • Sur mesure

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    Key Characteristics of 253 MA

    It exhibits high strength at 900°C(1652℉) and possesses excellent long-term high-temperature performance (creep resistance and endurance).

    In air,it can be used up to 1150°C(2102℉) under non-pressure conditions, with a scale formation temperature as high as 1150°C and exceptional oxidation resistance.

    At various temperatures,its short-term tensile strength exceeds that of conventional stainless steels (such as 304 et 310S) by over 20%.It exhibits high yield strength and tensile strength at elevated temperatures,enabling normal operation in environments up to 1050°C(1922℉).This makes it suitable for diverse heat treatment processes and high-temperature gas applications.

    Containing high proportions of elements such as chromium (Cr) and nickel (Ni),these elements provide excellent resistance to general corrosion and corrosion par piqûres,particularly in chloride-containing environments.It exhibits good resistance to a wide range of chemical media,including acids and alkalis,making it especially suitable for petroleum,chemical,and marine environments.

    Possesses excellent formability,weldability,and sufficient machinability.During processing and forming,it facilitates fabrication into products of various shapes and dimensions,and also enables the manufacture of complex shapes and structures.

    Due to its alloy composition,this material exhibits good resistance to fissuration par corrosion sous contrainte and is suitable for applications involving stress in environnements corrosifs.

    Composition chimique

    ÉlémentCSiMnPSCrNiNCe
    Contenu (wt%)0.05 – 0.121.40 – 2.50≤ 1.00≤ 0.045≤ 0.01520.00 – 22.0010.00 – 12.000.12 – 0.200.03 – 0.08

    Mechanical & Physical Properties

    BiensRésistance à la tractionLimite d'élasticité (décalage de 0,2%)ÉlongationDuretéDensité
    Valeur (typique)≥ 650 – 850 MPa(95 – 123 ksi)≥ 310 MPa(45 ksi)≥ 40≤ 2107.80g/cm³
    • Coefficient of Thermal Expansion:
      Average of 13.7×10⁻⁶/K between 20°C and high temperatures.
    • Conductivité thermique:
      Approximately 15 W/m·K (at 20°C).
    • Electrical Resistivity:
      0.85 Ω·mm²/m.

    253 MA Applications

    Application FieldType de composantComponent DetailSize RangeObjectif
    MetallurgicalTuyauRecuperator≈ 1/2″ – 24″Heat Recovery
    Blast FurnaceCoal Injection
    Traitement thermiqueRadiant TubeFurnace Element
    ThermocoupleProtection Tube
    FittingCorrugated boxHaute température
    PétrochimiqueTuyauStyrene Reactor≈ 1/2″ – 24″Process Tube
    EDC CrackingThermal Process
    Convection TubeEthylene Cracking
    Power IndustryBoiler NozzleCombustion Part
    Refinery/ChemicalFittingÉchangeur de chaleurComponent Part
    Expansion Bellow↓Thermal Stress
    Refining IndustryButtweld ElbowFluid Redirection
    Buttweld TeeBranch Connection
    General FurnaceRéducteurChange Diameter
    Sintering/CementCyclone SeparatorHigh Temp Dust

    253 MA stainless steel pipes have a wide nominal size range.
    Common seamless pipe sizes range from approximately 1/2“ to 8” NB, while welded pipe sizes range from approximately 6“ to 24” NB (NB = Nominal Bore).
    The table uniformly uses ≈ 1/2“ to 24” to indicate the approximate size range of the pipes.

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