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US 10,472,704 B2Granted
Cold work tool steel
AssigneeUddeholms AB
InventorsThomas Hillskog, Kjell Bengtsson, Petter Damm, Annika Engström Svensson, Rikard Robertsson, Kristoffer Steiner, Amanda Forsberg, Magnus Tidesten, Pär Emanuelsson
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Abstract
The invention relates cold work tool steel. The steel includes the following main components (in wt. %): C 2.2-2.4, Si 0.1-0.55, Mn 0.2-0.8, Cr 4.1-5.1, Mo 3.1-4.5, V 7.2-8.5, balance optional elements, iron and impurities.
Claims10
A powder metallurgy produced tool steel for cold working consisting of, in weight %:
- C
- 2.2-2.4
- Si
- 0.1-0.55
- Mn
- 0.2-0.8
- Cr
- 4.1-5.1
- Mo
- 3.1-4.5
- V
- 7.2-8.5
- W
- ≤0.3
- optionally one or more of
- N
- 0.02-0.15
- P
- ≤0.05
- S
- ≤0.5
- Cu
- ≤3
- Co
- ≤5
- Ni
- ≤3
- Nb
- ≤2
- Al
- ≤0.1
- Ti
- ≤0.1
- Zr
- ≤0.1
- Ta
- ≤0.1
- B
- ≤0.6
- Be
- ≤0.2
- Bi
- ≤0.2
- Se
- ≤0.3
- Ca
- 0.0003-0.009
- O
- 0.003-0.01
- Mg
- ≤0.01
- REM
- ≤0.2, and
- balance Fe apart from impurities,
- wherein the tool steel has an unnotched impact toughness in the transverse direction at 25° C. of 30-80 J at a hardness of 60 HRC in the hardened and tempered condition.
52 more elements
Dependencies are inferred from the claim text.