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Non-quenched and tempered steel

A non-quenching and tempering, steel technology, applied in the field of blanks for steel parts, can solve the problems of not being able to mesh with good precision, reducing the deformation of the fracture surface, etc., and achieve the effects of excellent fracture separation, less debris generation, and improved yield.

Active Publication Date: 2018-04-17
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these techniques reduce the amount of deformation of the cracked fracture surface, and on the other hand, make the material brittle, so that chips (chips) are generated at the time of cracking or when the fracture surfaces are engaged with each other.
Fragments on the fractured surface are dislocated when the fractured surface is meshed, so there may be a problem that the meshing cannot be performed with good precision

Method used

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  • Non-quenched and tempered steel

Examples

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Embodiment

[0083] Steel ingots were produced by continuous casting of steel melted in a converter having the composition shown in Table 1, and the steel ingots were formed into billets of 162 mm square by a billeting process, and formed into bar shapes with a diameter of 56 mm by hot rolling . Furthermore, the "-" mark in the table indicates that the content of the element involved in the place recorded by the mark is below the detection threshold. And, as shown in Table 2, prepared a plurality of by adjusting the presence or absence of electromagnetic stirring in the mold in continuous casting, the degree of superheat of molten steel in the tundish, and the pressure gradient under the light pressure at the final solidification part. , so that the segregation ratio of V has changed steel. When electromagnetic stirring was performed, stirring was performed at a flow rate of 65 cm / sec. Then, the steel was poured into the mold within the range of superheat degree in the tundish of 13-52° ...

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Abstract

A non-heat treated steel according to the present invention includes, as steel composition, by mass %, 0.20 to 0.60% of C, 0.50 to 2.0% of Si, 0.20 to 2.0% of Mn, 0.010 to 0.15% of P, 0.010 to 0.15% of S, 0.10 to 0.50% of V. 0.002 to 0.02% of N, and a balance consisting of Fe and impurities, in which, when a ratio of a maximum value of a V content in the steel to an average value of the V content in the steel in a cross section of the steel is defined as a segregation ratio of V, the segregation ratio of V is 1.0 or more and less than 3.0.

Description

technical field [0001] The present invention relates to a non-tempered steel material suitable for use without quenching and tempering treatment immediately after forming a steel part by hot forging, and particularly to a blank for steel parts used by cracking. Background technique [0002] Recently, non-quenched and tempered steels for hot forging (hereinafter referred to as non-quenched and tempered steels) that can omit quenching and tempering treatment are used in forged parts for automobile engines and forged parts for traveling. Non-quenched and tempered steel is a steel whose composition is designed to achieve excellent mechanical properties even if it is kept in an air-cooled or air-cooled state after hot forging, that is, even if the conventional quenching and tempering treatment is omitted. [0003] As one of parts where non-quenched and tempered steel is widely used, there is an engine connecting rod (hereinafter referred to as a connecting rod). The connecting r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00
CPCC22C38/60C21D2211/004C22C38/00C22C38/001C22C38/002C22C38/02C22C38/04C22C38/12C22C38/14C22C38/18C22C38/24C22C38/26C22C38/28
Inventor 寺本真也久保田学
Owner NIPPON STEEL CORP
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