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Protective slag for Austenic stainless steel plate wand crystallizer

A technology of mold powder and austenitic stainless steel, which is applied in the field of austenitic stainless steel slab mold powder, can solve the problems of high grinding loss rate, poor stability, and prone to depressions and cracks on the surface of the slab. Achieve the effects of reduced grinding loss, good stability and improved surface quality

Inactive Publication Date: 2005-08-24
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Mold slag adsorption of AL in molten steel 2 o 3 、Cr 2 o 3 、TiO 2 After waiting for inclusions, the performance changes greatly, the stability is poor, the surface of the slab is prone to defects such as depressions and cracks, and the loss rate of the surface of the slab before rolling is high.

Method used

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  • Protective slag for Austenic stainless steel plate wand crystallizer

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Experimental program
Comparison scheme
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Embodiment Construction

[0033] For the austenitic stainless steel 0Cr18Ni9 slab produced by the applicant’s second steelmaking plant, the composition requirements of the finished steel product

[0034] C≤0.07% Si≤1.00% Mn≤2.0% P≤0.035%

[0035] S≤0.030% Cr≤17.0%-19.0% Ni≤8%-11%

[0036] The size of the billet is 200×1240mm 2 , In the process of continuous casting and steel drawing, the temperature of molten steel in the tundish is 1480°C-1505°C, and the casting speed is 0.75-0.95m / min. Using the austenitic stainless steel slab mold mold slag of the present invention, the slag basicity CaO / SiO 2 =1.36, melting point 1098°C, melting speed 30 seconds, viscosity 0.156pa.s, thermal conductivity of mold slag at 800°C is 0.124W / m.k, thickness of mold slag liquid slag layer in mold is 11-14mm, mold slag consumption is 0.48 kg / steel, the grinding loss rate of the cast slab before rolling is 1.24%.

[0037] The steps to process the base material are as follows:

[0038] Pre-melted raw material 1, batching...

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Abstract

A protecting slag for stainless austenite steel slab crystallizer contains proportionally calcium oxide, SiO2, Al2O3, magnesium oxide, Fe2O3, manganese oxide, F ions, sodium oxide, lithium oxide and immobilized carbon. Its advantages are high surface quality of billet and low cost.

Description

Technical field [0001] The invention relates to an austenitic stainless steel slab crystallizer powder. Background technique [0002] With the continuous development of stainless steel production and stainless steel continuous casting technology, the requirements for mold powder for stainless steel continuous casting mold are getting higher and higher. The performance of mold powder for stainless steel continuous casting mold directly affects stainless steel continuous casting slabs and hot-rolled and cold-rolled products The quality of the board, especially the surface quality. [0003] Austenitic stainless steel refers to stainless steel whose structural structure is austenitic at high and low temperatures. The output of austenitic stainless steel sheet currently accounts for more than 50% of the total stainless steel. Compared with carbon steel and other stainless steels, austenitic stainless steel has a higher thermal expansion coefficient, stronger shrinkage ability a...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 段建平杨礼元程立马建明
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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