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Steel, carburized steel component, and carburized steel component production method

一种渗碳钢、部件的技术，应用在制造工具、涂层、炉子类型等方向，能够解决冷锻性降低等问题，达到切削性优异、廉价制造、冷锻性优异的效果

Inactive Publication Date: 2018-07-17
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the S content is increased, a large amount of coarse sulfides will be formed, and the cold forgeability will decrease.

Method used

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  • Steel, carburized steel component, and carburized steel component production method
  • Steel, carburized steel component, and carburized steel component production method
  • Steel, carburized steel component, and carburized steel component production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] Steels a to aa having the chemical compositions shown in Table 1A and Table 1B were melted in a 270-ton converter, and continuously casted using a continuous casting machine to manufacture a 220×220 mm square billet. Here, the superheat of the molten steel in the tundish was set to 30° C., and the casting speed was set to 1.0 m / min.

[0173] In the continuous casting of the slab, the average cooling rate in the temperature range from the liquidus temperature to the solidus temperature at a depth of 15 mm from the surface of the slab was determined by changing the amount of cooling water in the mold. control. In this manner, continuous casting was performed on slabs a to aa having the chemical compositions shown in Table 1A and Table 1B and having dendrite primary arm intervals of less than 600 μm within a range of 15 mm from the surface.

[0174] Steels a to o shown in Table 1A and Table 1B are steels having chemical compositions defined in the present invention. Stee...

Embodiment 2

[0226] Except for the average cooling rate (hereinafter referred to as "average cooling rate") in the temperature range from the liquidus temperature to the solidus temperature at a position at a depth of 15 mm from the surface of the slab, it is the same as steel a and steel Under the same manufacturing conditions as h, carburizing steels having the same chemical composition as steel a or steel h were produced, and various evaluations were performed on these carburizing steels by the same methods as steel a and steel h. The average cooling rate was set to the value shown in Table 3.

[0227] [table 3]

[0228]

[0229] As shown in Table 3, in Test Nos. 1 and 8 in which the average cooling rate was in the range of 100 to 500°C, since the sulfide was finely dispersed properly, the hardness before carburization, ultimate compressibility, The amount of wear on the flank surface and the weight of chips are within the acceptable range, and the thickness of the carburized layer ...

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Abstract

Steel according to one embodiment of the present invention includes prescribed ranges of chemical components, has a quenching index Ceq of more than 7.5 but less than 44.0, and has a metal structure that includes 85-100 area% of ferrite. The average distance between sulfides that have an equivalent circular diameter of at least 1 [mu]m but less than 2 [mu]m that are observed in a cross-section that is parallel to the rolling direction of the steel is less than 30.0 [mu]m. The density of the sulfides that have an equivalent circular diameter of at least 1 [mu]m but less than 2 [mu]m that are observed in the cross-section that is parallel to the rolling direction of the steel is 300 / mm<2> or higher.

Description

technical field [0001] The present invention relates to steel, carburized steel parts and methods of manufacturing carburized steel parts. [0002] this application claims priority based on Japanese Patent Application No. 2015-232117 for which it applied to Japan on November 27, 2015, and uses the content here. Background technique [0003] In steel used for machine structural parts, Mn, Cr, Mo, Ni, etc. are generally added in combination. Carburizing steel, which has such a chemical composition and is produced through casting, forging, rolling, etc., is subjected to mechanical processing such as forging and cutting, and then subjected to heat treatment such as carburizing to obtain a hardened layer having a surface layer, that is, a carburizing layer. The carbon layer and the base material that is not affected by the carburizing treatment, that is, the carburized steel part of the steel part. [0004] Among the costs of manufacturing such carburized steel components, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D1/06C21D8/06C21D9/28C21D9/32C22C38/60
CPCC21D8/06C21D9/28C21D9/32C21D1/06C22C38/60C21D2211/005C23C8/02C23C8/80C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/44C22C38/50C22C38/54C23C8/22C23C8/32
Inventor 志贺聪久保田学长谷川一水上英夫
Owner NIPPON STEEL CORP
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