Steel article
AssigneeUddeholm Tooling Aktiebolag
InventorsOdd Sandberg, Lennart Jonson
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Abstract
The invention concerns an article of a steel which is characterized in that it consists of an alloy which contains in weight-%: 1.2-2.0 C, 0.1-1.5 Si, 0.1-2.0 Mn, max. 0.2 N, max. 0.25 S, 4-8 Cr, 0.5-3.5 (Mo+W/2), 5-8 V, max. 1.0 Nb, balance essentially only iron and unavoidable impurities, and that the steel has a micro-structure obtainable by a manufacturing of the steel which comprises spray forming of an ingot, the micro-structure of which contains 8-15 vol-% carbides of essentially only MC-type where M substantially consists of vanadium, of which carbides at least 80 vol-% have a substantially rounded shape and a size in the longest extension of the carbides amounting to 1-20 μm.
Claims36
1-27. (canceled)
Process for producing a steel article comprising an alloy which contains in weight-%:
- 1.2-2.0
- C
- 0.1-1.5
- Si
- 0.1-2.0
- Mn
- max 0.2
- N
- max 0.25
- S
- 4-8
- Cr
- 0.5-3.5
- (Mo + W/2)
- 5-8
- V
- balance essentially only iron and unavoidable impurities,
- said process comprising spray forming an ingot to produce an ingot comprised of a steel having a micro-structure containing 8-15 vol-% carbides of essentially only MC-type where M substantially consists of vanadium, of which carbides at least 80 vol % have a substantially rounded shape and a size in the longest extension of the carbides amounting to 1-20 μm.
Dependencies are inferred from the claim text.