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Low-alloy steel

Osprey® 4340

Osprey® 4340 is a medium-carbon, low-alloy steel alloyed with nickel, chromium and molybdenum, and is suitable for heat treatment by quench and tempering to achieve high hardness and toughness.


Powder designed for

  • Additive Manufacturing (AM)
  • Metal Injection Moulding (MIM)

This metal powder is manufactured by Inert Gas Atomization (IGA), producing a powder with a spherical morphology which provides good flow characteristics and high packing density.

Technical data

Page updated Sep 14, 2023 11:00 AM CET (supersedes all previous editions)

Download datasheet PDF

  • Chemical composition (nominal), %

  • 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.

    Powder for Metal Injection Moulding (MIM)

    Osprey® MIM powder has a spherical morphology, resulting in high packing density. This enables the manufacture of feedstocks with high powder loading, which not only minimizes binder costs but also reduces part shrinkage during debinding and sintering. Spherical powder also has excellent flow characteristics, resulting in reduced tool wear and consistent mould filling.

    Osprey® MIM powder's low oxygen content allows better control of carbon and consistency during sintering. Low oxygen levels, together with high packing density, also facilitate faster sintering.

  • 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

    Powder for Metal Injection Moulding (MIM)

    Osprey® metal powder for Metal Injection Moulding (MIM) is available in a wide range of particle size distributions, from under 5 μm up to 38 μm. The table shows our standard particle size distributions for MIM powders.

    Typical particle size distributions for Metal Injection Moulding (MIM)*
    Size (μm) D10 (μm) D50 (μm) D90 (μm)
    ≤ 38 5.5 13.0 31.0
    ≤ 32 5.0 12.0 29.0
    80% ≤ 22 4.5 11.5 27.0
    90% ≤ 22 4.0 10.5 22.0
    90% ≤ 16 3.5 8.0 16.0

    *Particle size measurements performed using a Malvern laser particle size analyzer, typical D10, D50 and D90 provided.

    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.

    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 1330 1510 218 14.3
    L-PBF, as built Vertical 1230 1510 209 14.1

    1 x103

    Mechanical properties, imperial units
    Condition Direction Proof strength Tensile strength E-modulus Elongation
    Rp0.2 Rm A
    ksi ksi ksi1 %
    L-PBF, as built Horizontal 193 219 31.6 14.3
    L-PBF, as built Vertical 178 219 30.3 14.1

    Source: Chalmers University of Technology

    Mechanical properties
    Condition Direction Impact toughness
    Charpy V
    L-PBF, as built Horizontal 71
    L-PBF, as built Vertical 61

    1 x103

    Source: Sandvik and Chalmers University of Technology

  • Physical properties

    Wrought material data

    • Density: 7.85 g/cm3, 0.28 lb/in3
    • Thermal conductivity: 44.5 W/mK
    • Coefficient of thermal expansion: 12.3 10-6 K-1
    • Melting point: 1427 °C (2600 °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 low-alloy steel

Osprey® Standards* Fe C Cr Ni Mo Si Mn S P
4340 UNS G43400 Bal. 0.38-0.43 0.7-0.9 1.65-2.00 0.2-0.3 0.15-0.35 0.6-0.8 <0.040 <0.035
4365 - Bal. 0.62-0.66 0.7-0.9 1.65-2.00 0.2-0.3 0.15-0.30 0.6-0.8 0.04 0.035 4365
8620 UNS G86200 Bal. 0.18-0.23 0.4-0.6 0.4-0.7 0.15-0.25 0.15-0.35 0.7-0.9 0.04 0.035 8620
4140 UNS G41400 Bal. 0.38-0.43 0.8-1.1 - 0.15-0.25 0.15-0.35 0.75-1.00 0.04 0.035 4140
SCM415 UNS G41180 Bal. 0.13-0.18 0.9-1.2 0.25 0.15-0.30 0.15-0.35 0.6-0.9 0.03 0.03 SCM415
4605 AISI 4605 Bal. 0.4-0.6 - 1.5-2.5 0.2-0.5 ≤1.0 - - - 4605
SAE 52100 UNS G52986 Bal. 0.98-1.10 1.3-1.6 - - 0.15-0.35 0.25-0.45 0.025 0.025 SAE 52100

* Information about more standards is available in the datasheet for the respective alloy.

For more information

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