Steel for engine connecting rod and production method thereof

A technology of an engine connecting rod and a production method, which is applied in the field of steel material manufacturing and can solve problems such as large fluctuations in S and N content.

Pending Publication Date: 2021-10-29
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of large fluctuations in the content of S and N in the steel, and provide a steel for engine connecting rods and its preparation method. The present invention can precisely control the S in the steel by making low-alkalinity slag through the LF furnace N content; the whole process of RH furnace treatment is driven by nitrogen gas, which can ensure that the N content in the steel will not decrease during the entire RH vacuum treatment process, so as to precisely control the N content in the steel; the produced steel has a suitable structure and inclusion form, and has a good Comprehensive performance

Method used

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  • Steel for engine connecting rod and production method thereof
  • Steel for engine connecting rod and production method thereof
  • Steel for engine connecting rod and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A steel for an engine connecting rod in this embodiment, its chemical composition and its mass percentage are: C 0.70%, Si 0.18%, Mn 0.57%, P 0.022%, S 0.064%, Cr 0.13%, Ni 0.060% , V 0.035%, Al 0.004%, N0.0155%, O 0.0016%, and the rest are Fe and unavoidable impurities.

[0044] A kind of production method of steel for engine connecting rod of the present embodiment, comprises the following steps:

[0045] (1) Converter smelting

[0046] ① At the end of smelting, control C 0.25%, P 0.018%, tapping temperature T=1580 ℃, and use sliding plate to stop slag;

[0047] ② Add aluminum ingots to the molten steel during the tapping process. The amount of aluminum ingots added per ton of molten steel is 2.8 Kg, and other elements are added according to the chemical composition requirements;

[0048] (2) LF refining

[0049] ① The refining furnace produces low-basicity slag, and the basicity is controlled at 1.5. The composition and weight percentage of the refining slag are C...

Embodiment 2

[0062] With reference to embodiment 1 of the present invention, the present invention has also carried out other four embodiments, has also carried out a comparative example according to traditional process simultaneously, and the chemical composition list in embodiment 1-5 and comparative example 1 is referring to following table 1, implements See Table 2 below for the list of process parameters in Examples 1-5 and Comparative Example 1, and see Table 3 below for the performance test results of steel prepared using the chemical composition in Table 1 and the process parameters in Table 2 respectively.

[0063] Table 1 The chemical composition of each embodiment of the present invention and comparative example

[0064]

[0065] Table 2 The key process parameters of each embodiment of the present invention and comparative examples

[0066]

[0067] Table 3 List of performance, tissue and inclusion detection and analysis results of each embodiment of the present invention ...

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Abstract

The invention discloses steel for an engine connecting rod and a production method thereof. The steel comprises chemical components of, in percentage by mass, 0.69%-0.73% of C, 0.15%-0.25% of Si, 0.55%-0.60% of Mn, smaller than or equal to 0.045% of P, 0.060%-0.070% of S, 0.10%-0.15% of Cr, 0.04%-0.08% of Ni, 0.030%-0.040% of V, smaller than or equal to 0.010% of Al, 0.0120%-0.0260% of N, smaller than or equal to 0.0020% of O and the balance Fe and inevitable impurities. The production process route comprises the steps of converter smelting, LF refining furnace refining, RH vacuum furnace refining, continuous casting, rolling and slow cooling. By means of the method, the content of S and N in the steel can be accurately controlled, and the produced steel has appropriate structures and inclusion forms and has good comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of steel material manufacturing, in particular to a steel for an engine connecting rod and a production method thereof. Background technique [0002] With the rapid development of the automobile industry, high quality, high efficiency, low cost, and low energy consumption in the design and manufacturing process of engine parts have become the only way to improve product competitiveness. The production mode of traditional and outdated processing technology has been difficult to adapt to market changes, and the transformation of processing technology has become an inevitable development trend and direction. Many new processes break the routine, come into being with the characteristics of novel ideas and remarkable benefits, and meet the requirements of modern enterprises. Connecting rod cracking technology is an advanced new processing technology for connecting rods that appeared in the 20th century. Compared...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C38/46C22C38/06C22C33/06C21C7/06C21C7/10C21C7/00B22D11/18B22D11/115B22D11/22C21D8/06B21B37/74C21D11/00
CPCC22C38/02C22C38/04C22C38/60C22C38/46C22C38/06C22C38/001C22C33/06C21C7/06C21C7/0006C21C7/10C21C7/00B22D11/18B22D11/115B22D11/22B22D11/225C21D8/065B21B37/74C21D11/005C21D2211/009C21D2211/005
Inventor 张渊普李伟周海平杜方陈华强余爱华梁宝珠黄海玲
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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