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Steel for machine structure use attaining excellent cutting-tool life and method for cutting same

A technology of mechanical structure and cutting method, applied in the direction of manufacturing tools, metal material coating process, coating, etc., can solve the problems of non-use, cutting conditions and composition restrictions

Inactive Publication Date: 2011-10-05
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of Belag has many restrictions on cutting conditions and components, so it is generally not used

Method used

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  • Steel for machine structure use attaining excellent cutting-tool life and method for cutting same
  • Steel for machine structure use attaining excellent cutting-tool life and method for cutting same
  • Steel for machine structure use attaining excellent cutting-tool life and method for cutting same

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Embodiment

[0346] The effects of the present invention will be specifically described below using examples.

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Abstract

Provided is a steel for machine structure use which attains an excellent cutting-tool life at cutting speeds in a wide range regardless of the mode of cutting, such as continuous or intermittent cutting, and in various cutting environments such as an environment using a cutting oil, a dry or semi-dry environment, and an oxygen-enriched environment. Also provided is a method for cutting the steel. The steel has a chemical composition containing, in terms of mass%, 0.01-1.2% C, 0.005-3.0% Si, 0.05-3.0% Mn, 0.0001-0.2% P, 0.0001-0.35% S, 0.0005-0.035% N, and 0.05-1.0% Al and satisfying [Al%]-(27 / 14)[N%]=0.05%, with the remainder being Fe and incidental impurities. The steel is characterized in that when the steel is cut with a cutting tool in which the surface to come into contact with the work material has been coated with a metal oxide having a higher value of standard free energy of formation at 1,300 C than Al2O3, then an Al2O3 coating film is formed on the surface of the cutting tool.

Description

technical field [0001] The present invention relates to a steel for machine structural use with excellent cutting tool life and a cutting method thereof. Background technique [0002] In recent years, the increase in the strength of steel has progressed, but on the other hand, there has been a problem of lowering machinability. Therefore, the demand for steel that does not reduce cutting efficiency while maintaining strength is increasing. [0003] Conventionally, in order to improve the machinability of steel, there has been a method of adding Pb or S as a component, but Pb has a problem in terms of environmental load, and S has a problem of deteriorating mechanical properties if the added amount is increased. [0004] In addition, the so-called Belag is also applied as needed, that is, by adding Ca, the oxides in the steel are softened, and they are attached to the surface of the tool during cutting to protect the tool. However, the application of Belag has many restrict...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60C21D8/06
CPCC21D7/08C22C38/02C22C38/60C22C38/04C22C38/06C21D2261/00C23C10/28C22C38/001C21D9/22Y10T83/04Y10T83/0443
Inventor 间曾利治斋藤肇水野淳
Owner NIPPON STEEL CORP
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