Subscribe to the EPMA Mailing List

A Study of the Influence of Niobium on Sintering and Properties of MIM 440C stainless steel manufactured by Prealloy and Master Alloy Routes

  • : Keith Murray1, Martin Kearns1, Paul Davies1, Viacheslav Ryabinin2, Erainy Gonzalez2
  • : 1Sandvik Osprey, 2TCK S.A
  • : PDF Download
  • : 2015


The use of Metal Injection Moulding (MIM) continues to expand to cover an increasingly varied range of components across a multitude of advanced applications. One of the most versatile alloys currently used in MIM is 440C martensitic stainless steel as it offers a combination of high hardness and good corrosion resistance. These characteristics make the alloy suitable for applications including automotive engine parts, medical instruments and a range of machine tool components. Achieving reproducible properties and consistent hardness requires close control of carbon levels in particular.

There are a number of variants on 440C in use today: some with enhanced carbon levels to achieve higher hardness and some with additions of niobium (Nb), which is claimed to increase the sintering process window for the alloy. In this study, we examine the sintering behaviour at different temperatures of 440C and 440C + Nb made by prealloy and master alloy routes. Differences in hardness and mechanical properties are discussed with reference to chemistry and microstructures of sintered parts.


Non-EPMA member price shown. If you are an EPMA member please log in for your discount.
If you are logged in as a member but are still seeing this message, please contact us at
If you would like to find out about becoming an EPMA member, click here.
This product is currently only available to purchase via this website to companies with a valid EU VAT Number. If you are an individual or company without an EU VAT number wishing to purchase this, please contact EPMA directly at Alternatively, past Euro PM papers are available via ProQuest and Elsevier.
* This field is required
Go To Top