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Grade C350 Maraging SteelGrade C350

Maraging Steel

C350 - a maraging alloy steel containing 12.0% cobalt and 4.8% molybdenum.

This steel is produced by vacuum arc re-melting and provides a very high strength nominally 350 ksi tensile (2415 MPa) 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. C350 is usually supplied in the annealed condition where the microstructure consists of fine martensite before final heat treatment.

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.

C350 steel has good weldability.

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 C350 Maraging Steel Datasheet

Typical Applications:

  • Missile casings
  • Tooling
  • Ordnance mounting blocks
  • High performance motorsport components
  • Couplings
  • Jet engine and helicopter drive shafts
  • Load cells
  • Landing gear


Grade C350 Maraging Steel is available in bar and forgings. Our processing department within the Smith's Group utilises thirty power saws including fully automated magazine feed CNC rod blanking lines. We can economically cut your material regardless of the volume required.

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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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