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Grade C300 Maraging SteelGrade C300

Maraging Steel

Type C300 cobalt containing grade of maraging steel, produced by vacuum arc remelting, provides very high strength (nominally 300 ksi tensile) with an above average level of toughness. The alloy retains its strength up to 450°C and good notch impact is maintained down to minus 50°C and below. This material may be nitrided. C300 is usually supplied in the annealed condition where the microstructure consists of fine martensite. This structure is then maraged (precipitation hardened) to achieve final properties employing a relatively low temperature that results in the required combination of high strength and toughness.

The alloy has a density of 8.02 g/cc.

Machinability & Welding:

Maraging steels are usually machined in the annealed condition however they can be machined in the maraged condition. Components can be machined close to finished dimensions as the low temperature maraging treatment results in minimal distortion. In addition, the small contraction of approximately 0.05% due to maraging results in good dimensional stability.

C300 steel can be readily welded.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.



Download Grade C300 Maraging Steel Datasheet

Typical Applications:

  • Missile casings
  • Tooling
  • Ordnance breach blocks
  • High performance autosport components
  • Bearings
  • Transmission shafts


Grade C300 Maraging Steel is available in bar and forgings. We can also process the material for you - with 30 bandsaws available throughout the Smiths Group, we have the capacity to cut your material to exact size which means we supply the product much closer to your finished requirements.

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To find out more about Smiths Metal Centres range of high quality maraging steels, click on one of our products on the side menu of this web page.

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