Production method of automobile engine fracture splitting connecting-rod high-strength steel continuous casting billet

A technology for automobile engines and expanding connecting rods is applied in the field of metallurgy, which can solve the problems of corrosion of basic furnace lining ladle, low phosphorus content at the end of smelting, increased energy consumption, etc., and achieves low production cost, easy control of S component, and energy saving. Effect

Inactive Publication Date: 2014-11-26
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, because it is smelted by converter double slag method, the phosphorus content at the end of smelting is low, which greatly increases energy consumption. At

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1:

[0027] Process used: electric furnace smelting-eccentric tapping-LF furnace refining-continuous casting, the production chemical composition is: C0.4%, Si0.7%, Mn1.2%, P0.03%, S0.035%, N0 .016% of the high-strength steel continuous casting billets of automobile engine expansion and broken connecting rods, the steps are as follows:

[0028] 1) Electric furnace smelting: using molten iron and scrap steel as raw materials, the ratio of which is: molten iron: scrap = 6:1; rapid temperature increase in the early stage of smelting for decarburization and low flow slag, oxidation endpoint temperature: 1630℃; endpoint carbon is 0.3%, endpoint Phosphorus is 0.03%.

[0029] 2) Eccentric tapping: The tapping adopts the operation of retaining steel and slag. When tapping 1 / 3, add active lime 4kg / t, ferrous sulfide 2kg / t, aluminum block 1.5kg / t, silicon calcium barium 2.5kg / t, the molten steel entering the LF refining furnace has an oxygen content of 80 ppm and a sulfur cont...

Example Embodiment

[0038] Example 2:

[0039] Process used: electric furnace smelting-eccentric tapping-LF furnace refining-continuous casting, the production chemical composition is: C0.45%, Si0.6%, Mn1.3%, P0.05%, S0.045%, N0 .02% of the high-strength steel continuous casting billet of automobile engine expansion and broken connecting rod, the steps are as follows:

[0040] 1) Electric furnace smelting: using molten iron and scrap steel as raw materials, the ratio of which is: molten iron: scrap = 8:1; rapid decarburization and low flow slag in the early stage of smelting, oxidation end temperature: 1645 ℃; end carbon 0.35%, end point Phosphorus is 0.045%.

[0041] 2) Eccentric tapping: The tapping adopts the operation of retaining steel and slag. When tapping 1 / 3, add active lime 3kg / t, ferrous sulfide 2.5kg / t, aluminum block 1.2kg / t, calcium silicon Barium is 2.3kg / t, the oxygen content in the LF refining furnace is 60ppm, and the sulfur content is 0.06%.

[0042] 3) LF refining furnace: after mol...

Example Embodiment

[0050] Example 3:

[0051] Process used: electric furnace smelting-eccentric tapping-LF furnace refining-continuous casting, the production chemical composition is: C0.5%, Si0.75%, Mn1.1%, P0.045%, S0.04%, N0 .018% of the high-strength steel continuous casting billets of automobile engine expansion and broken connecting rods, the steps are as follows:

[0052] 1) Electric furnace smelting: using molten iron and scrap steel as raw materials, the ratio of which is: molten iron: scrap = 8:1; rapid temperature increase in the early stage of smelting for decarburization and low flow slag, oxidation endpoint temperature: 1630℃; endpoint carbon is 0.4%, endpoint Phosphorus is 0.042%.

[0053] 2) Eccentric tapping: The tapping adopts the operation of retaining steel and slag. When tapping 1 / 3, add active lime 3.5kg / t, ferrous sulfide 2.2kg / t, aluminum block 1.2kg / t, silicon The calcium barium is 2.2kg / t, and the oxygen content in the LF refining furnace is 70ppm, and the sulfur content is ...

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Abstract

The invention discloses a production method of an automobile engine fracture splitting connecting-rod high-strength steel continuous casting billet. The technology of electric furnace smelting-eccentric bottom tapping-LF refining-continuous casting is adopted. During the process of electric furnace smelting, operations of fast heating-up decarburization and less slag flow are adopted, and it is guaranteed that endpoint phosphorus content of the furnace is 0.03-0.045%. During the process of eccentric bottom tapping, deoxygenation, resulfurization and alloying are carried out. During the process of LF refining, a CaO-SiO2-MgO low-alkalinity slag system is adopted, yield of sulphur in molten steel is guaranteed, and diffusible desoxydation is carried out by the use of deoxygenation materials such as aluminum, silicon carbide, carbon powder, silicon iron powder, silico-calcium powder and the like so as to guarantee that oxygen content of molten steel is lower than 20ppm. Technologies such as full protective casting, electromagnetic stirring, weak cold and the like are adopted during the process of continuous casting. Through the above processes, it is ensured that P content of the continuous casting billet is stably controlled to 0.03-0.05%, sulphur content is stably controlled to 0.035-0.045%, low power level of the casting billet is not more than 1.0 level, oxygen content is not more than 20ppm and surface quality of the casting billet is excellent.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a production method for continuous casting slabs of high-strength steel for expanded connecting rods of automobile engines. Background technique [0002] The lightweight of automobiles requires the development of high-strength steel for automobiles, and requires its processing technology to be more energy-saving and reduce consumption. The expansion processing technology of automobile engine connecting rod and its corresponding expansion connecting rod material came into being. Compared with the traditional connecting rod processing technology, the engine connecting rod expansion breaking processing technology has incomparable superiority of the traditional connecting rod processing method. Broken connecting rod materials require high strength, low plasticity, suitable brittleness and good machinability. At present, the high-strength steels used in automobile connecting rods are mainly ...

Claims

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Application Information

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IPC IPC(8): C21C5/52C21C7/076C21C7/06B22D11/18B22D11/115B22D11/111B22D11/22
CPCY02P10/20
Inventor 张贤忠陈庆丰王国秋卜勇熊玉彰董玮韦泽洪李献忠张渊普黄红明李伟
Owner WUHAN IRON & STEEL (GROUP) CORP
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