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Powder Metallurgically Manufactured High Speed Steel

a technology of high-speed steel and metallurgy, applied in the field of high-speed steel, can solve the problems of negative affecting grindability and edge strength, and achieve the effects of improving hardness and edge strength, improving toughness/strength, and being easy to mild the machin

Inactive Publication Date: 2009-10-15
ERASTEEL KLOSTER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0004]It is an object of the present invention to provide a material to be used in cutting applications and having improved properties in respect of hardness and edge strength. This is achieved, somewhat surprisingly, by a high speed steel that is characterised by being powder metallurgically manufactured and by having a content of Si in

Problems solved by technology

High contents of Si in conventionally manufactured high speed steels will often result in large carbides, which large carbides will negatively affect grindability and edge strength, e.g. A good edge strength will contribute to a long life, an even life, and will enable high speed feeding, i.e. a high load on the edge.

Method used

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  • Powder Metallurgically Manufactured High Speed Steel
  • Powder Metallurgically Manufactured High Speed Steel
  • Powder Metallurgically Manufactured High Speed Steel

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Embodiment Construction

[0020]Without restricting the invention to any particular theory, the importance of the various alloying elements and of the various structural elements in achieving the desired property profile, will be explained in further detail. Percentages are always given in % by weight for alloying elements and in % by volume for structural elements, unless otherwise stated.

[0021]Carbon should exist at a content of 0.6 to 2.1%, more preferably 0.6 to 1.5%, and most preferred 1.0 to 1.15%, in order, when dissolved in the martensite, to result in a hardness in the hardened and tempered condition which is suitable for the application. Carbon should furthermore, in combination with vanadium, contribute to an adequate amount of primary precipitated MC-carbides, and, in combination with tungsten, molybdenum and chromium to contribute to the achievement of an adequate amount of primary precipitated M6C-carbides in the matrix. The purpose of such carbides is to give the material its desirable resista...

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Abstract

The present invention relates to a high speed steel with a chemical composition that comprises, in % by weight: 0.6-2.1 C 3-5 Cr 4-14 Mo max 5 W max 15 Co 0.5-4 V, balance Fe and impurities from the manufacturing of the material, which steel is powder metallurgically manufactured and has a content of Si in the range of 0.7<Si≦2.

Description

TECHNICAL FIELD[0001]The invention relates to a high speed steel with a chemical composition that comprises, in % by weight, 0.6-2.1 C, 3-5 Cr, 4-14 Mo, max 5 W, max 15 Co and 0.5-4 V, balance Fe and impurities from the manufacturing of the steel. The steel is intended to be used in cutting applications such as for drills, milling cutters and bandsaws.BACKGROUND[0002]Steel intended for cutting applications such as for drills, milling cutters and bandsaws, should preferably be characterised by good grindability and high edge strength. An example of a material with these properties is the conventionally manufactured high speed steel denoted HS2-9-1-8, the chemical composition of which is 1.0-1.15 C, 7.50-9.0 Co, 3.50-4.50 Cr, 9.00-10.00 Mo, 0.90-1.5 V, 1.20-1.90 W and max 0.70 Si.[0003]High contents of Si in conventionally manufactured high speed steels will often result in large carbides, which large carbides will negatively affect grindability and edge strength, e.g. A good edge str...

Claims

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Application Information

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IPC IPC(8): B22F3/15C22C38/18C22C38/36B22F3/02
CPCB22F2998/00B22F3/1208C22C38/02C22C38/04C22C38/22C22C38/24C22C38/30C22C33/0257C22C33/0285C22C37/06C21D1/18B22F2005/001B22F2003/248B22F3/24B22F3/15C22C38/36C22C38/34C22C37/10B22F3/04
Inventor SUNDIN, STEFAN
Owner ERASTEEL KLOSTER