Steel, machine component, and connecting rod

A technology of mechanical components and chemical components, applied in connecting rods, mechanical equipment, engine components, etc., can solve the problems of high strength and fracture surface fitting, and achieve excellent fracture separation and high yield ratio. , the effect of high tensile strength

Pending Publication Date: 2020-11-13
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in further increasing the strength, the balance between the high strength and the fit of the fracture surface cannot be solved by the current method

Method used

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  • Steel, machine component, and connecting rod
  • Steel, machine component, and connecting rod
  • Steel, machine component, and connecting rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0135] The present invention is described in detail below through examples. It should be noted that these examples are examples for explaining the technical meaning and effects of the present invention, and do not limit the scope of the present invention.

[0136] Converter-smelted steels having the compositions shown in the following Tables 1-1 and 1-2 were produced by continuous casting, and rolled raw materials of 162 mm square were produced through soaking diffusion treatment and blooming process as needed. Next, after heating the rolling raw material to 950 degreeC, the steel was made into the shape of the bar steel with a diameter of 56 mm by hot rolling. Underlined values ​​in Table 1-1 and Table 1-2 are values ​​outside the range of the present invention. In addition, the symbol "-" in Table 1-1 and Table 1-2 shows that the element related to this symbol was not added.

[0137] Next, in order to investigate the microstructure and mechanical properties, a test piece c...

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Abstract

A steel pertaining to an embodiment of the present invention contains, as the chemical composition thereof in terms of unit mass %, 0.25-0.55% C, 0.20-1.30% Si, 0.50-1.50% Mn, 0.010-0.200% P, 0.010-0.100% S, 0-1.20% Cr, 0.25-0.40% V, 0.010-0.070% Ti, 0-0.15% Mo, 0.0010-0.0060% N, 0-0.200% Al, 0-0.005% Ca, 0-0.005% Zr, 0-0.005% Mg, 0-0.0050% Bi, 0-0.50% Pb, 0-0.05% Nb, 0-0.05% Cu, and 0-0.05% Ni, the remainder comprising Fe and impurities, the chemical composition satisfying the expression 0.002<Ti-3.4*N<0.050.

Description

technical field [0001] The invention relates to steel, machine parts and connecting rods. [0002] This application claims priority based on Japanese Patent Application No. 2018-081536 for which it applied in Japan on April 20, 2018, and uses the content here. Background technique [0003] In the case of automobile engine parts and driving parts, forming by hot forging, followed by heat treatment such as quenching and tempering (hereinafter referred to as quenched and tempered steel parts), or when no heat treatment is applied ( Components that are not subjected to heat treatment are referred to as non-quenched and tempered steel components) to ensure the required mechanical properties for the applied components. Recently, from the viewpoint of economical efficiency in the manufacturing process, non-tempered steel parts, which are manufactured without quenching and tempering, are widely used. [0004] As an example of a component for an automobile engine, a connecting rod ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60F16C7/02
CPCC21D1/02C21D6/002C21D6/005C21D6/008C21D7/13C21D9/0068C21D2211/005C21D2211/009C22C38/00C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/46C22C38/50C22C38/60F16C7/023F16C9/045F16C2202/06F16C2202/08F16C2204/62F16C2204/64F16C2360/00
Inventor 寺本真也根石丰
Owner NIPPON STEEL CORP
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