Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1994-02-04
1996-06-11
Mai, Ngoclan
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75246, C22C 3302
Patent
active
055251404
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a new high-speed steel, which has been designed particularly for tools the use of which requires a good hot hardness and a high wear resistance. For this type of application commercial steels have previously been used, such as grade ASP.RTM.30 (currently available from Erasteel Kloster Aktiebolag, a Swedish corporation) which has the nominal composition 1.3 C, 0.4 Si, 0.3 Mn, 4.0 Cr, 5.0 Mo, 6.3 W, 8.5 Co, 3.1 V, balance iron and unavoidable impurities, or of grade ASP.RTM.60 (also available from Erasteel Kloster Aktiebolag), which has the nominal composition 2.3 C, 0.5 Si, 0.3 Mn, 4.0 Cr, 7.0 Mo, 6.5 W, 10.5 Co, 6.5 V, balance iron and unavoidable impurities. The purpose of the invention is to provide a high-speed steel having a still better hot hardness and a still higher wear resistance than the commercially available grades ASP.RTM.30 and ASP.RTM.60 as well as than other high-speed steels, known in the art, with a similar composition.
DESCRIPTION OF THE INVENTION
These and other objects according to the invention may be achieved with a steel that is manufactured powder-metallurgically, and that it has the following alloy composition in weight-%
1.0-2.5 C
max 1.0 Si
max 1.0 Mn
3-5 Cr
2-8 Mo
3-8 W
1.3-7 V
14-22 Co
0-2 Nb elements in normal amounts.
Moreover, the coordinates for the carbon content and for the cobalt content should not lie outside the area ABDEFH in the coordinate diagram in the appending FIG. 8, preferably within the area AB'CD'E'F'GH', and suitably within the area A'B"C'D'E"F"GH" in the diagram. In the diagram, the corner points of the areas are defined by the following C/Co-coordinates:
______________________________________ Broad area Preferred area
Most suitable area
______________________________________
A 1.0/22 A 1.0/22 A' 1.05/21
B 1.5/22 B' 1.4/22 B" 1.4/21
D 2.5/19 C' 1.65/19
C' 1.65/18.5
E 2.5/14 D' 2.5/17 D' 2.5/17
F 2.0/14 E' 2.5/15 E" 2.5/15.5
H 1.0/17 F' 2.2/15 F" 2.2/15.5
G 1.3/17 G 1.3/17
H' 1.0/20 H" 1.05/19.5
______________________________________
Within the frame which is defined by the above composition ranges and by the said diagram, respectively, there have been developed three different steel types, each one for a particular type of application. A first type--Type I--has been designed for tools which are subject particularly to a heavy adhesive wear at high temperature, where the hot hardness is of primary importance but where the wear resistance and hence the carbide volume has not the same significance as in the case of abrasive wear. Examples of typical ranges of uses for this high-speed steel of Type I are tools for cutting operations, e.g. cutter wheels, worm cutters, end-cutters, etc., particularly for working adhesive materials, such as stainless steels, titanium, and the like.
The second type--Type II--has been designed with the aim of cutting tools, such as cutter wheels, worm cutters, end-cutters, and the like, which are exposed to a combination of adhesive and abrasive wear, such as for example tools which are used for cutting case-hardening steels and other construction steels, tough-hardened steels, and the like. Typically this high-speed steel of Type II possesses in combination a very high hot hardness and a high wear resistance.
The third type of high-speed steels within the frame of the invention--Type III--has been designed in the first place for cutting as well as for non-cutting tools which are subject in the first place to abrasive wear. Cutting tools, for which this steel can be used, can be, e.g., cutter wheels, worm cutters, end-cutters, and the like for working carbon steels having high contents of cementite; certain casting steels; tool steels; etc. Among non-cutting tools, where this type of high-speed steel conveniently can be used, in the first place may be mentioned powder-pressing dies, where the steel according to the invention may replace cemented carbide as a tool material.
In the following, the choice of the various alloy elements will be
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Bednarek Michael D.
Erasteel Kloster Aktiebolag
Mai Ngoclan
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