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Ferritic stainless steel

Osprey® 441

Osprey® 441 is a ferritic stainless steel characterized by good corrosion resistance in acidic and chloride containing environments, and high strength.

UNS
S43940
ASTM, AISI
441
EN Number
X2CrTiNb18, 1.4509
DIN
X2CrTiNb18, 1.4509

Powder designed for

  • Additive Manufacturing (AM)

This metal powder is manufactured by either induction melting under Vacuum Inert Gas Atomization (VIGA) or melting under argon prior to Inert Gas Atomization (IGA).

Technical data

Page updated May 15, 2024 8:09 AM CET (supersedes all previous editions)

Download datasheet PDF

  • Chemical composition (nominal), %
    Fe
    Bal.
    Cr
    17.5-19.0
    Mn
    < 1.0
    C
    0.005-0.030
    Si
    < 1.0
    Nb
    0.70-0.95
    Ti
    0.2-0.6
    Ni
    < 1.0
    P
    < 0.040
    S
    < 0.040

  • Powder characteristics and morphology

    Powder for Additive Manufacturing

    Osprey® metal powder for Additive Manufacturing is characterized by a spherical morphology and high packing density, which confer good flow properties. For powder bed processes these are essential when applying fresh powder layers to the bed to ensure uniform and consistent part build.

    For blown powder processes, such as Direct Energy Deposition (DED), good flow ensures uniform build rates. Tight control of the particle size distribution also helps ensure good flowability. Low oxygen powders result in clean microstructures and low inclusion levels in the finished parts.

  • Particle size distribution

    Powder for Additive Manufacturing

    Osprey® metal powder for Additive Manufacturing is available in a wide range of particle size distributions that are tailored to the individual Additive Manufacturing systems. They can also be tailored to the particular requirements of the end application, both in terms of mechanical performance and surface finish.

    Typical particle size distributions for Additive Manufacturing.

    Typical particle size distributions for Additive Manufacturing
    Process technology Size (µm)
    Binder jetting ≤ 16, ≤ 22, ≤ 32, ≤ 38, ≤ 45
    Laser - Powder Bed Fusion (L-PBF) 15 to 53 and 10 to 45
    Electron beam - Powder Bed Fusion (E-PBF) 45 to 106
    Direct Energy Deposition (DED) 53 to 150

    Tailor-made particle size distributions are available on request. Contact us to discuss your specific requirements.

  • Mechanical properties

    The table below displays typical mechanical properties for as-built powder bed fusion – laser beam evaluated in room temperature. Material properties are given in two material conditions, as built and heat treated, by annealing at 900 °C for 20 minutes.

    Mechanical properties, metric units
    Condition Direction Proof strength Tensile strength E-modulus Elongation
    Rp0.2 Rm A
    MPa MPa MPa1 %
    L-PBF, as built Horizontal 741 889 210 27.8
    L-PBF, as built Vertical 679 864 189 29.6
    L-PBF, heat treated Horizontal 546 816 199 28.9
    L-PBF, heat treated Vertical 537 810 186 28.9

    1 x103

    Mechanical properties, imperial units
    Condition Direction Yield strength Tensile strength E-modulus Elongation, %
    Rp0.2 Rm A
    ksi ksi MPa1 %
    L-PBF, as built Horizontal 107 129 30 27.8
    L-PBF, as built Vertical 98 125 27 29.6
    L-PBF, heat treated Horizontal 79 118 29 28.9
    L-PBF, heat treated Vertical 78 117 27 28.9

    1 x103

    Source: Sandvik and Uppsala University.

  • Physical properties

    Wrought material data

    • Density: 7.7 g/cm3, 0.28 lb/in3
    • Thermal conductivity: 25 W/mK
    • Coefficient of thermal expansion: 10.0 10-6 K-1
    • Melting point: 1500 °C (2732 °F)

  • Testing

    All Osprey® metal powders are supplied with a certificate of analysis containing information on the chemical composition and particle size distribution. Information on other powder characteristics is available upon request.

  • Packaging

    A wide range of packaging options is available, from 5kgs plastic bottles to 250kg metal drums.

    5 kg (11 lbs) Plastic bottles
    6 kg (13 lbs) Plastic bottles
    10 kg (22 lbs) Plastic bottles
    20 kg (44 lbs) Metal cans
    100 kg (220 lbs) Steel drums
    150 kg (330 lbs) Steel drums
    250 kg (551 lbs) Steel drums
    All packaging materials are suitable for air, sea and road freight.

    Contact us for more information and to discuss your packaging requirements.

Disclaimer: Data and recommendations are for guidance only, and the suitability of a powder for a specific process or application can be confirmed only when we know the actual conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Osprey® powder.

Range of ferritic stainless steel

Osprey® Standards Fe C Cr Si Mn Mo S P N Nb Ti Ni
430 UNS S43000 / EN No. 1.4016 Bal. 0.12 16.0-18.0 1.0 1.0 - 0.03 0.04 - - - - 430
430L UNS 43000 Bal. 0.03 16.0-18.0 1.0 1.0 - 0.03 0.04 - - - - 430L
434 UNS S43400 / EN No. 1.4113 Bal. 0.12 16.0-18.0 1.0 1.0 1.0 0.03 0.04 - - - - 434
441 UNS S43940 Bal. 0.005-0.030 17.5-19.0 < 1.0 < 1.0 - < 0.040 < 0.040 - 0.70-0.95 0.2-0.6 < 1.0
446 UNS S44600 Bal. < 0.2 26.0-29.0 < 1.0 < 1.5 - < 0.015 < 0.040 0.15-0.25 - - - 446
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