US 7,682,417 B2Granted

Cold work steel article

AssigneeBohler Edelstahl GmbH

InventorsIngrid Schemmel, Stefan Marsoner, Werner Liebfahrt

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Abstract

A cold work steel article. The article comprises a material which comprises, in addition to Fe, the elements C, Si, Mn, P, S, Cr, Mo, Ni, V, W, Cu, Co, Al, N and O in certain concentrations and has been produced by by a powder metallurgical process. 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. 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.

Claims39

Dependent claims

A cold work steel article, wherein the article comprises a material having a composition, in % by weight, of:

Carbon
from more than about 0.6 to less than about 1.0
Silicon
from more than about 0.3 to less than about 0.85
Manganese
from more than about 0.2 to less than about 1.5
Phosphorus
from 0 to about 0.03
Sulfur
from 0 to less than about 0.5
Chromium
from more than about 4.0 to less than about 6.2
Molybdenum
from more than about 1.9 to less than about 3.8
Nickel
from 0 to less than about 0.9
Vanadium
from more than about 1.0 to less than about 2.9
Tungsten
from more than about 1.8 to less than about 3.4
Copper
from 0 to less than about 0.7
Cobalt
from more than about 3.8 to less than about 5.8
Aluminum
from 0 to less than about 0.065
Nitrogen
from 0 to less than about 0.2
Oxygen
from 0 to about 0.012
the balance being iron and accompanying and impurity elements due to smelting, the material produced by a powder metallurgical process.

28 more elements

A process for producing a cold work steel article, which process comprises making a blank of a metal material by a powder metallurgical process and converting the blank into the article, wherein the metal material comprises, in % by weight:

Carbon
from more than about 0.6 to less than about 1.0
Silicon
from more than about 0.3 to less than about 0.85
Manganese
from more than about 0.2 to less than about 1.5
Phosphorus
from 0 to about 0.03
Sulfur
from 0 to less than about 0.5
Chromium
from more than about 4.0 to less than about 6.2
Molybdenum
from more than about 1.9 to less than about 3.8
Nickel
from 0 to less than about 0.9
Vanadium
from more than about 1.0 to less than about 2.9
Tungsten
from more than about 1.8 to less than about 3.4
Copper
from 0 to less than about 0.7
Cobalt
from more than about 3.8 to less than about 5.8
Aluminum
from 0 to less than about 0.065
Nitrogen
from 0 to less than about 0.2
Oxygen
from 0 to about 0.012
the balance being iron and accompanying and impurity elements due to smelting.

28 more elements

A metal material for producing a cold work steel article by a powder metallurgical process, which material comprises, in % by weight:

Carbon
from more than about 0.6 to less than about 1.0
Silicon
from more than about 0.3 to less than about 0.85
Manganese
from more than about 0.2 to less than about 1.5
Phosphorus
from 0 to about 0.03
Sulfur
from 0 to less than about 0.5
Chromium
from more than about 4.0 to less than about 6.2
Molybdenum
from more than about 1.9 to less than about 3.8
Nickel
from 0 to less than about 0.9
Vanadium
from more than about 1.0 to less than about 2.9
Tungsten
from more than about 1.8 to less than about 3.4
Copper
from 0 to less than about 0.7
Cobalt
from more than about 3.8 to less than about 5.8
Aluminum
from 0 to less than about 0.065
Nitrogen
from 0 to less than about 0.2
Oxygen
from 0 to about 0.012
the balance being iron and accompanying and impurity elements due to smelting.

28 more elements

Dependencies are inferred from the claim text.

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Abstract