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Low-alloy steel

Osprey® 4140

Osprey® 4140 is a low-alloy steel alloyed with chromium, molybdenum and manganese, and suitable for heat treatment by quench and tempering to achieve high hardness.

UNS
G41400
ASTM, AISI
4140

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 Jul 18, 2023 10:50 AM CET (supersedes all previous editions)

Download datasheet PDF

  • Chemical composition (nominal), %
    Fe
    Bal.
    C
    0.38-0.43
    Cr
    0.8-1.1
    Mo
    0.15-0.25
    Si
    0.15-0.35
    Mn
    0.75-1.00
    S
    0.04
    P
    0.035

  • 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 Impact toughness
    Rp0.2 Rm A Charpy V
    MPa MPa MPa1 % J
    L-PBF, as built Horizontal 1300 1420 225 13.9 100
    L-PBF, as built Vertical 1240 1400 218 14.2 92

    1 x103

    Mechanical properties, imperial units
    Condition Direction Proof strength Tensile strength E-modulus Elongation Impact toughness
    Rp0.2 Rm A Charpy V
    ksi ksi ksi1 % ft-lb
    L-PBF, as built Horizontal 189 206 32.6 13.9 74
    L-PBF, as built Vertical 180 203 31.6 14.2 68

    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: 42.6 W/mK
    • Coefficient of thermal expansion: 12.2 10-6 K-1
    • Melting point: 1416 °C (2580 °F)

  • Heat treatment

    Osprey® 4140 can be heat treated to different material conditions using tempering. The alloy can be tempered between 200 °C and 600 °C to a desired hardness.

  • 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
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
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 4340
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
4605 AISI 4605 Bal. 0.4-0.6 - 1.5-2.5 0.2-0.5 ≤1.0 - - - 4605
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
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
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

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

For more information

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