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High-carbon microalloy round steel for fracture splitting connecting rod of automotive engine and production method thereof

A technology of automobile engine and cracking connecting rod, which is applied in the direction of temperature control, etc., can solve the problems of unstable product quality, and achieve the effects of excellent surface quality, energy saving and strong operability

Inactive Publication Date: 2011-06-29
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Only a few steel mills have explored the continuous casting process of some micro-alloy forged steel. The process flow is: Beiman Special Steel: 30EAF-EBT-40tLF-3.15t ingot pouring; Guiyang Special Steel: 60tEAF-LF-CC; Laiwu Iron and Steel : 15tEAF-ladle bottom blowing argon refining-685kg steel ingot, but their common disadvantage is that the product quality is not stable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The weight percent of the chemical composition of the high-carbon microalloy round steel used in the car engine cracking connecting rod is C: 0.60%, Si: 0.17%, Mn: 0.30%, P: 0.020%, S: 0.050%, N: 0.015 %, it also contains one or more of the microalloying elements V, Nb, Ti, B, and the balance is Fe and unavoidable impurities.

[0026] The production method of high-carbon micro-alloy round steel used for cracking connecting rods of automobile engines includes low-level heart electric furnace-VD vacuum treatment furnace-LF ladle furnace-continuous casting-rolling-controlled cooling process, and its specific production steps are as follows The above steps consist of:

[0027] (1) High-drawing carbon tapping is adopted, and the carbon content of tapping is controlled at 0.50%. After the furnace, aluminum blocks and Ba-Ca-Si are added to the ladle for pre-deoxidation, wherein the addition of aluminum blocks is 0.5kg / t, Ba-Ca-Si The amount of Ca-Si added is 1.5kg / t; others a...

Embodiment 2

[0035] The weight percent of the chemical composition of the high-carbon microalloy round steel used in the car engine cracking connecting rod is C: 0.70%, Si: 0.27%, Mn: 0.60%, P: 0.040%, S: 0.065%, N: 0.0225 %, it also contains one or more of the microalloying elements V, Nb, Ti, B, and the balance is Fe and unavoidable impurities.

[0036] The production method of high-carbon micro-alloy round steel used for cracking connecting rods of automobile engines includes low-level heart electric furnace-VD vacuum treatment furnace-LF ladle furnace-continuous casting-rolling-controlled cooling process, and its specific production steps are as follows The above steps consist of:

[0037] (1) The tapped carbon content of the high-draw carbon tapped steel is controlled at 0.55%. After the furnace, aluminum blocks and Ba-Ca-Si are added to the ladle for pre-deoxidation. The amount of aluminum blocks added is 0.6kg / t, Ba-Ca -Si addition amount is 1.75kg / t; others are alloy and slagging ...

Embodiment 3

[0045] The weight percent of the chemical composition of the high-carbon microalloy round steel used in the car engine cracking connecting rod is C: 0.80%, Si: 0.37%, Mn: 0.90%, P: 0.060%, S: 0.080%, N: 0.0300 %, it also contains one or more of the microalloying elements V, Nb, Ti, B, and the balance is Fe and unavoidable impurities.

[0046] The production method of high-carbon micro-alloy round steel used for cracking connecting rods of automobile engines includes low-level heart electric furnace-VD vacuum treatment furnace-LF ladle furnace-continuous casting-rolling-controlled cooling process, and its specific production steps are as follows The above steps consist of:

[0047] (1) High-drawing carbon tapping is adopted, and the carbon content of tapping is controlled at 0.60%. After the furnace, aluminum blocks and Ba-Ca-Si are added to the ladle for pre-deoxidation, wherein the addition of aluminum blocks is 0.7kg / t, Ba-Ca-Si The amount of Ca-Si added is 2.0kg / t; others ...

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Abstract

The invention discloses high-carbon microalloy round steel for a fracture splitting connecting rod of an automotive engine and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.60 to 0.80 percent of C, 0.17 to 0.37 percent of Si, 0.30 to 0.90 percent of Mn, 0.020 to 0.60 percent of P, 0.050 to 0.080 percent of S, 0.015 to 0.0300 percent of N, one or several of microally elements V, Nb, Ti and B, and the balance of Fe and inevitable impurities. The production method of the high-carbon microalloy round steel comprises: (1) steel tapping by high catching carbon; (2) vacuum degassing (VD) vacuum treatment; (3) treatment in ladle furnace (LF); (4) execution of a continuous casting process; and (5) heating and rolling of continuously cast blank, and execution of a segmental cooling process of high-temperature quick cooling and low-temperature slow cooling. The high-carbon microalloy round steel provided by the invention has the characteristics of high cleanness, small composition segregation, low crack sensitivity, uniform and fine texture and high surface quality, and the provided production method has the characteristics of low production cost, energy conservation, simple process route, high maneuverability and simplicity of control.

Description

technical field [0001] The invention relates to the production field of microalloy cracking connecting rods in the metallurgical industry, in particular to a high-carbon microalloy round steel used for cracking connecting rods of automobile engines and a production method thereof. Background technique [0002] With the continuous intensification of competition, new processes, new materials and new equipment in the automotive industry are constantly emerging. Now, as a brand-new engine connecting rod manufacturing process, the cracking process has attracted the attention of automobile manufacturers. Compared with the traditional connecting rod manufacturing method, the cracking process has the advantages of shortening the production cycle, reducing the number of processes, lowering the dependence on manufacturing equipment and reducing the manufacturing cost of connecting rods. [0003] Cracked connecting rod materials used in automotive engines require high strength, low de...

Claims

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Application Information

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IPC IPC(8): C22C38/60C21C7/10C21C7/06B22D11/115B22D11/124B21B37/74
Inventor 张贤忠陈庆丰熊玉彰周新龙邱文涛韦泽洪王国秋李献忠张渊普陈华强杜芳黄海玲邵主彪余爱华
Owner WUHAN IRON & STEEL (GROUP) CORP
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