Low-carbon sulphur free-cutting steel

A free-cutting steel and carbon-sulfur technology, applied in the field of low-carbon sulfur free-cutting steel, can solve the problem that the machined surface roughness may not be sufficient, and achieve the effect of small machined surface roughness, excellent hot workability and excellent surface properties

Active Publication Date: 2010-03-31
NIPPON STEEL CORP
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Problems solved by technology

[0024] Although the technologies proposed in the above-mentioned patent documents 1 to 5 can all improve the machinability during forming processing using HSS tools, when such superhard tools are used for finishing turning processing, the machined surface roughness is not necessarily sufficient.

Method used

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  • Low-carbon sulphur free-cutting steel

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Embodiment Construction

[0054] 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 %".

[0055] In the low-carbon sulfur free-cutting steel of the present invention, in the finish turning process, the most required point is to maintain a small machined surface roughness under the same tool during a long period of machining, and it is necessary to suppress the tool for this reason. Grooved wear on front end.

[0056] C: More than 0.02% and less than 0.20%

[0057] C is an element that has a great influence on machinability and strength. In finish turning using superhard tools, in order to reduce the roughness of the machined surface, the content of C must be kept below 0.20%. This is because when the C content is 0.20% or more, the hardness of the steel becomes high, and the groove-shaped wear at the tip of the to...

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Abstract

A low-carbon sulphur free-cutting steel which contains C: 0.02% to less than 0.20%, Si: more than 0.10% to 1.5%, Mn: 0.8 to 2.2%, P: 0.005 to 0.25%, S: more than 0.40% to 0.8%, O: <0.010%, N:<= 0.025%, and Ca: 0.0003 to 0.005% with the balance consisting of Fe and impurities and in which the impurities contain Al < 0.005%, Mg < 0.0003%, Ti <= 0.002%, Zr <= 0.002%, and REM < 0.0003% and the relationships: 2.0 < Mn / S < 4.0, and 0.0005 <= 10Ca x Si <= 0.050 are satisfied attains a smaller finished-surface roughness than that of conventional non-Pb low-carbon free -cutting steel and excellent chipdisposability in the finish cutting process by turning with a carbide tool. The low-carbon sulphur free-cutting steel may contain one or more of Te<=0.05%, Bi<=0.15%, and Sn<=0.5% and / or one or moreof Cr<=2.0%, Mo<=0.5%, V<=0.3%, and Nb<=0.3%.

Description

technical field [0001] The present invention relates to a low-carbon sulfur free-cutting steel, and relates to a Pb-free steel that has excellent machinability in finishing turning using a superhard process, and is particularly suitable for use in OA parts such as small-diameter printer shafts. Low carbon sulfur free cutting steel. Background technique [0002] Conventionally, in the raw materials of soft small parts, such as brake parts of automobile parts, printer shafts of OA parts, and electrical equipment parts, so-called "quick" steel materials with excellent machinability have been used in order to improve productivity. cut steel". [0003] As the free-cut steel material, there is known a steel material specified in JIS G 4804 (1999), that is, a "sulfur free-cut steel material" (hereinafter referred to as "S free-cut steel material") in which a large amount of S is added and machinability is improved by using MnS. ), "sulfur composite free-cutting steel" with both S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60
CPCC22C38/60C22C38/02C22C38/04
Inventor 松井直树长谷川达也
Owner NIPPON STEEL CORP
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