Rolled material for fracture split connecting rod excelling in fracture splittability, hot forged part for fracture split connecting rod excelling in fracture splittability, and fracture split connect

A technology of separated and rolled materials, which is applied in the field of rolling suitable for manufacturing, can solve problems such as large deformation, achieve high strength and reduce costs

Active Publication Date: 2009-04-08
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to this, ductile fracture of ferrite is likely to occur, and the broken surface of the connecting rod body and the connecting rod cover do not match, so the deformation at the time of fracture becomes large.

Method used

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  • Rolled material for fracture split connecting rod excelling in fracture splittability, hot forged part for fracture split connecting rod excelling in fracture splittability, and fracture split connect
  • Rolled material for fracture split connecting rod excelling in fracture splittability, hot forged part for fracture split connecting rod excelling in fracture splittability, and fracture split connect
  • Rolled material for fracture split connecting rod excelling in fracture splittability, hot forged part for fracture split connecting rod excelling in fracture splittability, and fracture split connect

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Embodiment

[0107] Hereinafter, the present invention is described in more detail by citing the examples, but the present invention is certainly not limited by the following examples, and can also be appropriately modified and implemented within the scope of being able to meet the aforementioned purpose, and these are all included in the technical scope of the present invention .

manufacture example

[0109] Follow the usual smelting method to melt and cast steel with the chemical composition shown in Tables 1 and 2, then billet and roll to obtain bar steel. Second, it is forged to a thickness of 25mm by hot forging. In addition, in the above-mentioned production method, the adjustment of Pc is performed by adjusting the composition and the average cooling rate at 800 to 600° C. after hot forging. In addition, the average aspect ratio of the sulfide-based inclusions is controlled by changing the temperature of the steel material before rolling, and adding Ca, Zr, Te, etc. to spheroidize the sulfide-based inclusions. These elements are all added after Al is added.

[0110] Using the obtained steel bar, the measurement of the ferrite fraction, the measurement of the average aspect ratio of the sulfide-based inclusions, and the evaluation of the fracture separation property were carried out in the following manner.

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Abstract

The present invention provides a rolled material having excellent fracture splitting characteristics and suitable for the manufacture of a connecting rod in which a through-hole section for assembly in a crankshaft is fracture split in substantially semicircles. Prescribed components are contained, an average aspect ratio of a sulfide-based inclusion as observed in a D / 4 portion (D is the diameter of the rolled material) in a cross-section parallel to a longitudinal direction of the rod-shaped rolled material is not more than 10.0, a Pc indicated in Equation (1) below is between 0.41 and 0.75, and a Veq indicated in Equation (2) below is not less than 0.18 mass %. Pc=C(1-alpha / 100) (1) {In Equation (1), C represents the carbon content in steel (mass %) and alpha represents the ferrite fraction (area ratio %)}; Veq=V+Ti / 2+Si / 20 (2) {In Equation (2), V, Ti and Si represent the content of each element in steel (mass %)}.

Description

technical field [0001] The present invention relates to a rolled material for a fracture-separable connecting rod excellent in fracture-separability, a hot-forged part for a fracture-separable connecting rod excellent in fracture-separability, and a fracture-separable connecting rod. A rolled material suitable for the manufacture of a connecting rod in which the through hole on the crankshaft is fractured and separated into nearly semicircular parts, a hot forged part obtained by using the rolled material, and a hot forged part obtained by using the hot forged part Fracture separation type connecting rod. Background technique [0002] In internal combustion engines such as gasoline engines and diesel engines, a connecting rod (hereinafter referred to as "con rod") is used as a part that connects the piston and the crankshaft and transmits the reciprocating motion of the piston to the crankshaft to convert it into rotary motion. The connecting rod is a part having a through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60B21K1/14C21D8/00
CPCB21K1/12C21D2211/009C21D9/0075C22C38/02C21D9/0068C22C38/04C21D2211/005C22C38/60C22C38/24C22C38/002C22C38/005C22C38/06C22C38/38
Inventor 阿南吾郎椎桥庆太
Owner KOBE STEEL LTD
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