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Method for producing low-carbon high-sulfur (sulfur-phosphorous) easy-to-cut structural steel continuous casting billet

A production method and easy-cutting technology, which is applied in the field of continuous casting of low-carbon and high-sulfur (sulfur-phosphorus) free-cutting structural steel continuous casting billets, can solve the problems of inability to compete in the imported material market, high production costs of free-cutting structural steel, etc. , to achieve the effect of strong versatility of equipment and process, high billet rate and low production cost

Inactive Publication Date: 2005-09-07
BAOSTEEL SPECIAL STEEL CO LTD
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Problems solved by technology

Therefore, today, the domestic low-carbon high-sulfur (sulfur phosphorus) free-cutting structural steel is generally produced by die-casting, which makes the production cost of free-cutting structural steel high (the billet rate of die casting is 14% lower than that of continuous casting above), unable to compete with imported materials in the market

Method used

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Embodiment Construction

[0025] specific implementation plan

[0026] The steelmaking branch of a steel company implements the patent of the invention, and the production cross-section size is 90×90mm 2 ~360×360mm 2 Low-carbon high-sulfur (sulfur-phosphorus) free-cutting structural steel continuous casting billets (structural steel varieties: American grades 1108, 1109, 1110, 1116, 1117, 1118, 1119, 1211, 1212, 1213, 1215, Japanese grades SUM11 . 2 1213, 1215 structural steel as an example) thousands of tons, the process flow is: 60 tons (30-100 tons) electric furnace primary refining; 60 tons (corresponding tonnage) bottom blowing argon ladle furnace refining; 3 machines, 3 streams 160× 160mm 2 Continuous casting machine pouring. The first step is to carry out the initial smelting of molten steel in a 60T electric furnace: pass in electric current and input oxygen to melt the loaded charge into molten steel in the temperature range of 1640-1660°C; (End point oxygen content) control 700ppm; EBT r...

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Abstract

A continuous casting billet of low-carbon and high-sulphur free-cutting constructional steel production method with the following properties: (1) primary smelting: tapping with degree of oxygen activity of 700ppm, adding right amount Al when tapping of 20% and refinery cinder when tapping of 90%; (2) molten steel refining in LF refined-smelting ladle furnace: (A) deoxidising on top of the slag: agitating and blowing argon from bottom with pressure of 0.5MPa and analyzing sample and adjusting components after energizing for 10 minutes; (B) slag refining: adding 58%CaO,11%Al2O3, 9%SiO2 and 8 %MgO to get degree of oxygen activity of 60ppm; (C) closing argon from bottom when temperature of molten steel is 90 Deg.C more than liquidus line temperature, and feeding sulfur core-spun yarn rapidly. (3) continuous casting: (A) casting rate rationally, such as square continuous casting billet with casting rate of 2m / min; (B) roller pressure of every sedan at the end of conticaster is different from that of 10Bar; (C) setting rational continuous casting technical parameter. Continuous casting billet, which is made by steel of many pattern numbers such as 1213 and 1215, possesses the properties of high stabilization of component, good continuous casting, low cost of manufacture, high quality of casting blank (which meets the rolling request of subsequent heat working) and profound economic benefit.

Description

technical field [0001] The invention relates to a smelting production method of free-cutting structural steel in the metallurgical industry, in particular to a smelting production method of sulfur (or sulfur-phosphorus composite) system free-cutting structural steel. Background technique [0002] Structural steel (mainly low-alloy structural steel and carbon structural steel) is a common steel variety, and its production process is: killed steel smelting process, plus casting forming (high-temperature molten steel solidification forming). Usually, in the smelting process, in order to improve the purity of the steel (improve the various performance indicators of the steel), strong deoxidation measures (that is, adding strong deoxidation elements to the steel, such as adding aluminum ingots for precipitation deoxidation, white slag diffusion deoxidation, vacuum Carbon deoxidation, etc.) is an essential technical means. There are two methods of solidification and forming of hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00C21C7/00
Inventor 胡俊辉林俊杨伟宁陈新建徐芗明
Owner BAOSTEEL SPECIAL STEEL CO LTD
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