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Steel with good cutting and cutting breaking performance for physical construction

A technology of mechanical structure and machinability, which is applied in the field of steel for mechanical structure and can solve problems such as dispersion of machinability

Inactive Publication Date: 2006-09-20
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 1

[0119] The invention is applied to S45C steel. The alloy composition is shown in Table 1 (working example) and Table 2 (comparative example). The operating conditions of the free-cutting steel, component ratios, and performance data such as tool life and chip-breakability are shown in Table 3 (Operating Example) and Table 4 (Comparative Example) together.

[0120] In Tables 3 and 4 (and also in subsequent tables presenting test results), the abbreviations have the following meanings:

[0121] S / O: [S] / [O]

[0122] Ca·S: [Ca]×[A][←sic]

[0123] Ca / S: [Ca] / [S]

[0124] TiZrN: [Ti+Zr]×[N]

[0125] S.I. Area: Area occupied by sulfide inclusions

[0126] MnS Numb.: Number of MnS inclusion particles

[0127] (Particles per 0.01%-S / mm 2 )

[0128] D.S.I. area: percentage of area occupied by composite inclusions (%)

[0129] Pro.Film: Tool protection film formation (yes / no)

[0130] Mach.: machinability (yes / no)

[0131] Chip-Brk.: Detritus - Breakability (Good / Poor)

Embodiment 2

[0133] 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).

Embodiment 3

[0135] 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).

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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 Patents(China)
IPC IPC(8): C22C38/14C22C38/00C22C38/02C22C38/04C22C38/60
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