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Low carbon sulfur free-machining steel

A free-cutting steel and sulfur technology, applied in the field of low-carbon sulfur free-cutting steel, can solve the problems that "carburization" may not be excellent, continuous casting may not be excellent, etc., and achieve good chip handling, small surface roughness, The effect of cheap mass production

Inactive Publication Date: 2008-05-21
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned conventionally proposed free-cutting steels are not necessarily excellent in "carburization"
In addition, the "continuous castability" required at the manufacturing stage for inexpensive mass production is not necessarily excellent.

Method used

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Experimental program
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Effect test

Embodiment Construction

[0068] First, the chemical composition of the low-carbon sulfur free cutting steel of the present invention and the reason for its limitation will be described. In addition, in the following description, "%" of content of each element shows "mass %".

[0069] C: More than 0.05% and less than 0.20%

[0070] C is an important element that greatly affects the pluckability. When machinability is emphasized in the application of steel, if C is contained at 0.20% or more, the strength of the steel will increase and the machinability will deteriorate. Cracking will accelerate tool wear, and the roughness of the processed surface will also increase and deteriorate. Therefore, the content of C is not less than 0.05% and less than 0.20%. In addition, in order to obtain better machinability, the content of C is preferably 0.06 to 0.18%.

[0071] Si: less than 0.02%

[0072] Si is a powerful deoxidizing element with a strong affinity with O (oxygen). If it is contained at 0.02% or mo...

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PUM

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Abstract

The low carbon sulfur free-machining steel comprises C: 0.05 to less than 0.20%, Si < 0.02%, Mn: 0.7 to 2.2%, P: 0.005 to 0.25%, S: more than 0.40 to 0.60%, Al < 0.003%, O: 0.0090 to 0.0280%, and N: 0.0030 to 0.0250% with the balance consisting of Fe and impurities. The steel optionally comprises one or more of Te, Sn and Se and / or one or more of Cu, Ni, Cr and Mo. The impurities comprise Ca < 0.001%, Mg < 0.001%, Ti < 0.002%, Zr <0.002%, and REM < 0.001% and satisfies Mn O > 0.018 and 2.5 < Mn / (S + O) < 3.5.This invention provides a low carbon sulfur free-machining steel that has machinability favorably comparable with Pb free-machining steels and Pb-added composite free-machining steels in relatively low-speed cutting using HSS tools, has excellent carburizing properties and continuous casting properties, and is suitable as materials for soft small components such as automobile brake components, components for peripheral devices in personal computers and components for electrical machineries and apparatuses.

Description

technical field [0001] The present invention relates to a low-carbon sulfur free-cutting steel, and in detail relates to an existing lead free-cutting steel (hereinafter referred to as "Pb free-cutting steel") and a complex addition of Pb even without the addition of Pb. Composite free-cutting steel with other free-cutting elements such as , S and P (hereinafter referred to as "Pb-added composite free-cutting steel") is equivalent to or above low-carbon sulfur free-cutting steel with good machinability. More specifically, it relates to a Pb-free low-carbon sulfur free-cutting steel that can be mass-produced cheaply and mass-produced because it has good machinability when cutting with a high-speed steel tool, is excellent in carburization, and is also excellent in continuous castability. Background technique [0002] In the past, the raw material of soft small parts, such as brake parts for automobiles, personal computer peripheral equipment parts and electrical equipment par...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/60
CPCC22C38/04C22C38/002C21D6/005C22C38/005C22C38/60
Inventor 松井直树西隆之加藤彻长谷川达也
Owner NIPPON STEEL CORP
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