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Steel with good cutting and cutting breaking performance for physical construction

A technology of mechanical structure and machinability, applied in the field of steel for mechanical structure, can solve the problems of machinability dispersion and so on

Inactive Publication Date: 2003-07-02
DAIDO STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although steel exhibits excellent machinability, dispersion of machinability sometimes occurs

Method used

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  • Steel with good cutting and cutting breaking performance for physical construction
  • Steel with good cutting and cutting breaking performance for physical construction
  • Steel with good cutting and cutting breaking performance for physical construction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] In the following examples, those with uppercase letters (A1, B1...) are operational examples, and those with lowercase letters (a1, b1...) are comparative examples. The prepared alloy was cast into ingots, from which 72 mm diameter round bar test pieces were cut for testing. Test methods and standards are described below. [area occupied by composite inclusions]

[0070] When composite inclusions or sulfide-type inclusion particles containing Ca and close to oxide-type inclusion particles, every 3.5mm 2 Occupies 2.0×10 -4 mm 2 or more area marked "yes", the opposite case, "no". [area percentage of composite inclusions]

[0071] The whole sulfide-type inclusions in the micrograph (magnification 200) are divided into simple sulfide-type inclusions and composite inclusions. Find the percentage of area occupied by composite inclusions. [Machinability]

[0072] Carry out turning of carbide tools under the following conditions: Cutting speed: 200m / min Feed speed: 0.2mm...

Embodiment 2

[0079] The same production process and machinability test as in Example 1 were applied to S15C steel. Alloy compositions are shown in Table 5 (Working Example) and Table 6 (Comparative Example), and test results are shown in Table 7 (Working Example) and Table 8 (Comparative Example). Example 3

[0080] The same production process and machinability test as in Example 1 were applied to S55C steel. Alloy compositions are shown in Table 9 (Working Example) and Table 10 (Comparative Example), and test results are shown in Table 11 (Working Example) and Table 12 (Comparative Example). Example 4

[0081] The same production process and machinability test as in Example 1 were applied to SCR415 steel. Alloy compositions are shown in Table 13 (Working Example) and Table 14 (Comparative Example), and test results are shown in Table 15 (Working Example) and Table 16 (Comparative Example). Example 5

[0082] The same production process and machinability test as in Example 1 were a...

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Abstract

Disclosed is a steel for machine structural use having good machinability and chip-breakability as well as a method of producing the steel. The steel consists essentially of, by wt.%, C: 0.05-0.8%, Si: 0.01-2.0%, Mn: 0.1-3.5%, S: 0.01-0.2%, Al: 0.001-0.020%, Ca: 0.0005-0.02%, O: 0.0005-0.01% and N: 0.001-0.04%, and further, one or both of Ti: 0.002-0.010% and Zr: 0.002-0.025%, the balance being Fe and inevitable impurities. At production of the steel controlled deoxidization is conducted by operation meeting certain conditions so that at least a certain amount of ''duplex inclusion'' having a specific chemical composition may be formed, and Ti and / or Zr is added to precipitate finely dispersed MnS inclusion particles with nuclei of Ti-oxide and / or Zr-oxide. The finely dispersed MnS inclusions must share a determined part of the total sulfide inclusions.

Description

technical field [0001] The present invention relates to a steel for machine structural use having good machinability and chip breakability in cutting with a cemented carbide tool, and a method for producing the steel. The present invention also relates to steels for machine construction which exhibit high fatigue strength and bendability in addition to good machinability and chip breakability. Background technique [0002] In the present invention, the term "duplex inclusion" means an inclusion having a structure in which a core mainly composed of an oxide inclusion is surrounded by another inclusion mainly composed of a sulfide. The terms "tool life ratio" and "life ratio" mean the ratio of the tool life of the free cutting steel according to the present invention to that of ordinary sulfur free cutting steel containing the same S content when turning with a cemented carbide tool. "Finely dispersed" MnS inclusion particles are finer than those contained in ordinary MnS inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/02C22C38/04C22C38/14C22C38/60
CPCC22C38/60C22C38/001C22C38/002C22C38/02C22C38/04C22C38/14
Inventor 速石正和狩野隆石田和久红林丰保母诚
Owner DAIDO STEEL CO LTD
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