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Low-carbon sulfur-automatic steel with good cutability

A free-cutting steel and machinability technology, applied in the field of low-carbon sulfur free-cutting steel, can solve problems such as the deterioration of the roughness of the machined surface, and achieve the effect of good surface roughness and inhibiting the formation of pores.

Inactive Publication Date: 2008-12-24
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, if oxygen and N are increased at the same time, it is easy to cause (CO gas + N 2 The pores caused by the gas) degrade the roughness of the processed surface of the steel

Method used

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  • Low-carbon sulfur-automatic steel with good cutability
  • Low-carbon sulfur-automatic steel with good cutability
  • Low-carbon sulfur-automatic steel with good cutability

Examples

Experimental program
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Embodiment

[0103] Various molten steels are smelted by changing the content of Si, Mn, S, Al, N, etc. by using a molten steel treatment facility consisting of a 3t-scale induction furnace, a 100t converter, and a ladle. At this time, Si and Al are adjusted by changing the Si concentration and Al concentration in the added Fe—Mn alloy and Fe—S alloy. Before casting the molten steel obtained in this way into a predetermined mold, it was measured using a free oxygen detector (trade name "HYOP10A-C150" manufactured by Heleus Electronite Co., Ltd.) to obtain a free oxygen concentration.

[0104] In addition, when performing continuous casting of a slab with a cross-section of 300mm×430mm or using a 3t-scale induction furnace, a cast iron mold (section size 300mm×430mm) designed for the same cooling rate as the slab is used. , Cast molten steel. At this time, if necessary, a magnetic field is applied to the mold to perform electromagnetic stirring.

[0105] The obtained slab (or ingot) was s...

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Abstract

A low-carbon sulfur-containing free-cutting steel having excellent cuttability, characterized in that it contains 0.02-0.15 mass percent C, up to 0.004 mass percent Si (excluding 0 mass percent), 0.6-3 mass percent Mn, 0.02-0.2 mass percent P, 0.35-1 mass percent S, up to 0.005 mass percent Al (excluding 0 mass percent), 0.008-0.03 mass percent O, and 0.007-0.03 mass percent N, with the remainder being Fe and unavoidable impurities, and that the ratio of the manganese content [Mn] to the sulfur content [S], [Mn] / [S], is in the range of 3-4 and the contents satisfy the relationship (1): 10[C][Mn]<-0.94> + 1226[N]<2> <= 1.2 ...(1) (wherein [C], [Mn], and [N] represent the contents by mass percent of carbon, manganese, and nitrogen, respectively).

Description

technical field [0001] The present invention relates to a low-carbon sulfur free-cutting steel which exhibits good roughness of the cutting surface without using Pb which is harmful to the human body. Background technique [0002] Low-carbon sulfur free-cutting steel is widely used as steel for small parts such as screws and printer shafts that do not require special strength, in addition to hydraulic parts of automobile transmissions. In addition, when there are further requirements on the roughness of the machined surface and chip disposal, lead-sulfur free-cutting steel in which lead (Pb) is added to the above-mentioned low-carbon sulfur free-cutting steel is used. [0003] Pb contained in free-cutting steel is an extremely effective element for improving machinability, but it is accused of being harmful to the human body. In addition, there are many problems in the treatment of lead fumes and cutting chips during smelting. Therefore, it is required to exhibit good machi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B22D11/00B22D11/115C22C38/60
CPCB22D11/001B22D11/115C22C38/001C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14
Inventor 坂本浩一吉田敦彦
Owner KOBE STEEL LTD
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