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Steel and component

A component and quality technology, applied in the field of steel and components, can solve the problems of large deviation of rolling fatigue life and large size of sulfide, and achieve the effect of improving hardenability, surface starting point peeling life and bending fatigue strength

Active Publication Date: 2020-01-03
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to recent advances in steelmaking technology, the diameter of oxides has been reduced, and as a result, the size of sulfides has become relatively large, and the variation in rolling fatigue life may be increased when only oxides are used as an index for countermeasures.

Method used

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Examples

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Embodiment

[0219] Next, examples of the present invention will be described. However, the conditions in the examples are examples of conditions adopted for confirming the practicability and effects of the present invention, and the present invention is not limited by the examples of conditions. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0220]

[0221] [Production of bar steel]

[0222] Molten steel having the compositions shown in Table 1 was produced in a 300 kg vacuum melting furnace and cast into ingots. After heating the ingot at 1150° C. for 30 minutes, hot forging was performed so that the processing temperature became 950° C. or higher, and a steel bar with a diameter of 60 mm was produced.

[0223]

[0224] A part of a steel bar with a diameter of 60 mm was cut, and hot forging was performed on the cut steel bar to manufacture a steel bar with a di...

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Abstract

The purpose of the present invention is to provide steel having improved hardenability, toughness, surface originated exfoliation life, and bending fatigue strength, and a component manufactured usingthat steel. Provided is steel having prescribed components, wherein Fn1 as defined by the following equation (1) is 0.20-0.65 and Fn2 as defined by the following equation (2) is 0.50-1.00. Fn1 = 4.2* [Cr] / (7.0 * [Si] + 16.0 * [Mn]) ... (1) [Elements]: percent by mass of elements Fn2 = A1 / A2 ... (2) A1: total surface area (microns<2>) of included sulfides, which have a circle equivalent diameterof 1.0 micron or greater and include 1.0 mol% or greater Ca of the total number of moles included in the sulfides, in an observed region with a total surface area of 4.0 mm2 A2: total surface area (microns<2>) of included sulfides, which have a circle equivalent diameter of 1.0 microns, in an observed region with a total surface area of 4.0 mm2

Description

technical field [0001] The present invention relates to steels having improved hardenability, toughness, surface initiation peel life and bending fatigue strength and parts manufactured using such steels. Background technique [0002] Mechanical structural parts such as bearings, automotive parts such as constant velocity joints and wheel hub units are required to have excellent rolling fatigue characteristics due to the repeated action of high surface pressure. In order to improve performance and increase the output of the engine, the urgent desire for weight reduction, miniaturization and high stress load has become extremely strong, and the use environment of the above-mentioned components has become severe. [0003] In response to the above-mentioned requirements, the raw materials of bearing components are generally carried out to reduce the Al content that is the cause of peeling of rolling parts as much as possible. 2 o 3 The amount of representative non-metallic in...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/22C22C38/54
CPCC22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/26C22C38/28C22C38/32C22C38/44C22C38/00C22C38/54
Inventor 山下朋广平上大辅根石丰田中康介今高秀树
Owner NIPPON STEEL CORP
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