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  • Material

    MP35N, UNS R30035, 2.4999

    Note that MP35N is a trademark of SPS Technologies Inc.

  • Overview

    MP35N alloy is a nonmagnetic, age hardenable,nickel-cobalt-chromium-molybdenum alloy possessing a unique combination of ultrahigh tensile strength up to 300 ksi(2068 MPa), good ductility and toughness, and excellent corrosion resistance. In addition, this alloy displays exceptional resistance to hydrogen sulphide, salt water and other chloride solutions, high temperature oxidation, and hydrogen embrittlement. It also has excellent resistance to crevice and stress corrosion cracking in sea water and other hostile environments.

  • Characteristics

    MP35N alloyfeatures exceptional resistance to stress corrosion cracking at very high strength levels under severe environmental conditions that can crack most conventional alloys. It is also highly resistant to other forms of localized attack, such as pitting and crevice corrosion.

  • Application

    Because of its unique combination of properties, MP35N alloy has been used in a wide variety of applications. MP35N alloy has been used in fasteners, springs, nonmagnetic electrical components and instrument parts in medicalimplants, seawater, oil and gas well, and chemical and food processing environments.

  • Chemical Composition (wt% as per ASTM F562)

    Material

    C

    Si

    Mn

    P

    S

    Cr

    R30035

    ≤0.025

    ≤0.15

    ≤0.15

    0.015

    0.010

    19.0~21.0

    Material

    Ni

    Mo

    Ti

    B

    Fe

    Co

    R30035

    33.0~37.0

    9.0~10.5

    ≤1.0

    ≤0.015

    ≤1.0

    balance

  • Mechanical Property

    Solution annealed condition

    Material

    Tensile strength

    ksi (MPa)

    Yield strength at

    0.2 offset ksi (MPa)

    Elongation in 2

    % min.

    Reduction of area

    % min.

    R30035

    115~155

    (793~1069)

    35~85

    (241~586)

    50

    65

  • Corrosion Resistance

    MP35N alloy possesses excellent resistance to sulfidation, high temperature oxidation, hydrogen embrittlement, saline solutions and most mineral acids.

    This alloy features exceptional resistance to stress corrosion cracking at very high strength levels under severe environmental conditions that can crack most conventional alloys. It is also highly resistant to other forms of localized attack, such as pitting and crevice corrosion.

    In seawater environments, this alloy is virtually immune to general, crevice and stress corrosion, regardless of strength level or process condition.

  • Heat Treatment

    Annealing

    MP35N alloy should be annealed at 1925±25°F [1050±15°C], 1 to 2 h at temperature, air cooled or water quenched to room temperature.Reducing atmospheres such as Hydrogen and forming gas are recommended for thermal treatment.


    Aging

    After work hardening, MP35N alloy can be aged in the temperature range of 800/1200°F (427/649°C) for increased strength. The alloy will respond to aging only if first work strengthened. No increase in strength will result from aging annealed material.
    For optimum mechanical properties, cold worked MP35N alloy should be aged at 1000 to 1200°F ± 25°F [540 to 645°C ± 15°C] for 4 h and air cooled.
    Relevant specification requirements should be consulted prior to any heat treating operations.


  • Available Process

    (1)Hot formed, solution annealed, descaled

    (2)Cold worked and bright annealed

    (3)Cold worked, aged, polished (MP, EP etc.)

  • Common Tests

    Chemical composition

    Tension

    Hardness

    Flaring

    Flange

    Flattening

    Micro structure

    Hydrostatic

    NDT

    Intergranular Corrosion

    Surface condition

    Shape and dimension

    Positive Material Identification

  • Product Forms

    Form

    Size range

    Capillary tube

    OD 0.08 ~ 6.0 mm

    WT 0.015 ~ 1.5 mm

    Thin wall & Ultra thin wall seamless tube

    OD6.0~80.0 mm

    WT 0.05~4.5 mm

    Micro ID and heavythick wall seamless tube

    OD3.0~50.0 mm

    ID0.30~5.0mm

    Precision conic seamless tube

    Bigger end: OD3.0 - 426.0mm

    Smaller end: OD2.5 - 346.0mm

    WT: 0.15 - 40.0mm

    HP/UHP BA+ tube

    EP tube

    OD 1.0 ~ 76 mm

    WT 0.10 ~ 10.0 mm

    Small caliber precision seamless tube

    OD6.0 ~89mm

    WT 0.50 ~9.0 mm

    Profiled seamless tube

    Build to drawing

    Build to specification

    Bourdon tube

    Y40, Y50, Y60, Y70, Y100, Y150

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