Steel having excellent machinability for mechanical structure

A technology of mechanical structure and quality, applied in the field of steel for mechanical structure, to achieve the effect of excellent machinability

Inactive Publication Date: 2013-03-20
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In recent years, automotive parts have been required to further improve processing accuracy and fatigue strength, but the actual situation is that the steel used for mechanical structures in the past cannot meet the requirements.

Method used

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  • Steel having excellent machinability for mechanical structure
  • Steel having excellent machinability for mechanical structure
  • Steel having excellent machinability for mechanical structure

Examples

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Embodiment ）

[0180] Steels having the compositions shown in Tables 2 and 3 were melted and rolled into 65Φ steel bars. In Tables 4 to 6, steel numbers 1 to 105 show the value of formula (1), the value of formula (2), the value of formula (3), the value of formula (4), and the value of formula (5). When the steel contains Cr, the value of formula (6), the value of formula (7), the value of formula (8), and the value of formula (9) are shown. Steels with numbers 1 to 94 are invention examples, and steels with numbers 95 to 105 are comparative examples.

[0181] After holding the above-mentioned bar steel at 900°C for 1 hour, it was air-cooled, and the test piece was cut out. Before quenching, the hardness (Hv), tool wear (μm) and proeutectoid ferrite fraction were measured. Rate(%). The results are shown in Tables 4-6. In addition, after quenching, the 300°C tempering hardness Hv and the roller pitting fatigue strength (fatigue limit, MPa) of the hardened layer were measured. The results...

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Abstract

Provided is a steel for a mechanical structure, which comprises, by mass%, 0.40% to less than 0.75% of C, 0.01% to 3.0% of Si, 0.1% to 1.8% of Mn, 0.001% to 0.1% of S, greater than 0.1% to 1.0% of Al, 0.001% to 0.02% of N, no more than 0.05% of P, and residual Fe and inevitable impurities as the balance, and which satisfies 139.38<=214[C]+30.6[Si]+42.8[Mn]-14.7[Al]<=177 and 0.72<=[C]+1 / 7[Si]+1 / 5[Mn]<1.539.

Description

technical field [0001] The present invention relates to steel for machine structural use, and in particular, to steel for machine structural use with excellent machinability, which can be used for manufacturing high-strength automotive parts. [0002] This application is based on Japanese Patent Application No. 2010-160136 filed in Japan on July 14, 2010, Japanese Patent Application No. 2010-160108 filed in Japan on July 14, 2010, and filed in Japan on July 14, 2010 Japanese Patent Application No. 2010-160141 for the application and Japanese Patent Application No. 2010-160140 for which the application was filed in Japan on July 14, 2010 claim the priority, and the contents thereof are cited here. Background technique [0003] Conventionally, in order to improve the machinability of steel, it is effective to add machinability-improving elements such as S, Pb, and Bi. However, if Pb and Bi are added, the strength decreases within a range that has little influence on forging. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60
CPCC22C38/14C22C38/002C22C38/60C22C38/34C22C38/005C22C38/12C22C38/04C22C38/22C22C38/44C22C38/50C22C38/42C22C38/06C22C38/26C22C38/02C22C38/008C22C38/28C22C38/16C22C38/08C22C38/001C22C38/18C22C38/32C22C38/00C22C38/24C21D8/0226C21D1/42Y02P10/25
Inventor 间曾利治吉田卓久保田学宫西庆小泽修司
Owner NIPPON STEEL CORP
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