Steel excellent in machinability and method for production thereof

A manufacturing method and machinability technology, applied to steel with excellent machinability and its manufacturing field, can solve the problems of easy occurrence of built-up edge, insufficient uniform dispersion, inability to improve surface finish, etc.

Inactive Publication Date: 2005-12-21
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is presumed that the fine dispersion level of inclusions under these regulations is only processed for particles with an average diameter of about 3 μm, and the uniform dispersion is not sufficient, so built-up edge is prone to occur, which cannot be achieved as in the past. Improves surface finish like leaded free-cutting steels, etc.

Method used

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  • Steel excellent in machinability and method for production thereof
  • Steel excellent in machinability and method for production thereof
  • Steel excellent in machinability and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] The effects of the present invention will be described using examples. Table 1, Table 2 (continued from 1 of Table 1), Table 3 (continued from 2 of Table 1), Table 4 (continued from 3 of Table 1), Table 5 (continued from 4 of Table 1), Table 6 (continued from 5) Among the test materials shown, No.13 was smelted in a 270-ton converter, and the others were smelted in a 2-ton vacuum melting furnace, rolled into steel plates in pieces, and then rolled into 60 mm.

[0138] In the item of heat treatment in the table, the examples described as normalizing were kept at 920° C. for 10 minutes or more, and then air-cooled. In the example of the present invention, which is referred to as QT (Quenching and Tempering), it is quenched from 920° C. in a water tank at the rear end of the rolling line, and then kept at 710° C. for 1 hour or more during annealing. This adjusts the pearlite area ratio. In the example of the present invention, although the amount of C is low, the pearli...

Embodiment 2

[0157] Table 9, Table 10 (Continued from 1 of Table 9), Table 11 (Continued from 2 of Table 9), Table 12 (Continued from 3 of Table 9), Table 13 (Continued from 4 of Table 9), Table 14 (Continued from Table 9 5) A part of the test material shown in 5) was smelted in a 270-ton converter, and cast at a cooling rate of 10 to 100° C. / min. Rolled into steel plates in blocks, and then rolled into 50 mm. Others are smelted in a 2-ton vacuum melting furnace and rolled into 50 mm. At this time, the cooling rate of the ingot is adjusted by changing the cross-sectional size of the mold. The machinability of the material was evaluated by the drill piercing test under the conditions shown in Table 7 and the plunge cutting under the conditions shown in Table 8. The drilling and piercing test is a method of evaluating machinability at the highest cutting speed (so-called VL1000, unit: m / min) capable of cutting to a cumulative hole depth of 1000 mm. Plunge cutting is a method of evaluati...

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Abstract

The present invention consists of C: 0.005-0.2%, Si: 0.001-0.5%, Mn: 0.2-3.0%, P: 0.001-0.2%, S: 0.03-1.0%, B: 0.005-0.05%, total N: 0.002~0.02%, total O: 0.005~0.035%, the balance is Fe and unavoidable impurities, and it is to meet the Mn / s in the steel is limited to 1.2~2.8, or in the steel A steel with excellent machinability characterized by either or both of which the area ratio of pearlite with a particle diameter exceeding 1 μm in the microstructure is 5% or less, and a method for producing the same.

Description

technical field [0001] The present invention relates to a steel used in automobiles and general machinery, and a method for producing the steel, and in particular, to a steel having excellent machinability with good tool life during cutting, smoothness of the cut surface, and chip disposability, and a method for producing the same. Background technique [0002] General machines and automobiles are manufactured by combining various parts, but in many cases, the parts are manufactured through a chipping process from the viewpoint of required precision and manufacturing efficiency. At this time, cost reduction and productivity improvement are required, and for steel, improvement of machinability is also required. Especially in the past, SUM23 and SUM24L were developed with emphasis on machinability. It has been known so far that in order to improve machinability, it is effective to add machinability-improving elements such as S and Pb. However, depending on the needs, Pb is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00B22D11/22B22D27/04C22C38/00C22C38/60
Inventor 桥村雅之水野淳内藤贤一郎萩原博矶部浩一平田浩
Owner NIPPON STEEL CORP
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