Cold-forming steel article
AssigneeBoehler Edelstahl GmbH & Co. KG
InventorsGerhard Jesner, Devrim Caliskanoglu
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Abstract
A cold-forming steel article which comprises an alloy that comprises carbon, manganese, silicon, chromium, molybdenum, vanadium, tungsten and optionally, niobium in certain concentrations, as well as up to about 0.4 wt. % of accompanying elements, remainder iron and contaminants. The article is formed by atomization of a melt and hot isostatic pressing of the resultant powder. The article exhibits a hardness of at least about 60 HRC and a toughness in terms of impact strength of higher than about 50 J. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.
Claims20
A cold-forming steel article, wherein the article comprises an alloy which comprises, in % by weight:
- C from about 1.1 to about 1.7
- Mn from about 0.1 to about 0.6
- Si from about 0.4 to about 1.1
- Cr from about 5.6 to about 7.0
- Mo from about 1.2 to about 1.8
- V from about 3.5 to about 3.9
- W from about 1.1 to about 5.0
- and optionally niobium as well as less than about 0.4 wt. % of accompanying elements, the remainder being iron and contaminants, and wherein the article has been formed by a process comprising atomization of a melt to form a powder and hot isostatic pressing (HIP) of the powder, and wherein the article has been hardened by a heat treatment and exhibits a material hardness of at least 60 HRC and a material toughness of higher than 50 J.
A process for making a cold-forming steel article, wherein the process comprises atomization of an alloy melt to form a powder and hot isostatic pressing (HIP) of the powder and hardening the article by a heat treatment to a material hardness of at least 60 HRC and a material toughness of higher than 50 J, the alloy comprising, in % by weight:
- C from about 1.1 to about 1.7
- Mn from about 0.1 to about 0.6
- Si from about 0.4 to about 1.1
- Cr from about 5.6 to about 7.0
- Mo from about 1.2 to about 1.8
- V from about 3.5 to about 3.9
- W from about 1.1 to about 5.0
- and optionally niobium as well as less than about 0.4 wt. % of accompanying elements, the remainder being iron and contaminants.
Dependencies are inferred from the claim text.