Deoxidization of calcium-silicon barium for smelting 82B steel

A technology of silicon-calcium-barium and deoxidizer, which is applied in the field of steelmaking, can solve the problems of unsteady production, nozzle hole-in, etc., and achieve the effect of improving steel quality

Inactive Publication Date: 2006-05-31
SHOUGANG CORPORATION
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AI Technical Summary

Problems solved by technology

For casting 82B continuous casting slabs with small cross-sections and high C content, since the temperature of molten steel in the tundish is low at 1486-1499°C, if a deoxidizer containing Al is used, it is very easy to cause the nozzle to overhole, and stable production cannot be achieved

Method used

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Embodiment Construction

[0015] During the process of smelting steel SWRH82B for steel strands, silicon-calcium-barium deoxidizer was added along with the steel flow when the 80t converter was tapped. The addition amount was 200kg, and its chemical composition was as follows (%): Si, 55.1; ; Al, 1.07; S, 0.12; P, 0.019. Converter tapping temperature is 1600-1630°C.

[0016] furnace number

[0017] The use of Si-Ca-Ba alloy is more conducive to the floating of inclusions, the total amount of inclusions in steel is low, and the size of most inclusions is less than 6 μm. Electron probe analysis showed that no Ba-containing inclusions were found in the steel. The whole steelmaking process is very smooth, and the steel composition and quality are uniform and stable.

[0018] furnace number

[0019] 82B wire rod, which accounts for 1 / 3 of the total domestic demand, is produced by this method and is in good use.

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Abstract

A deoxidizating technique by Si-Ba-Ca alloy in 82B steel-making which includes adding deoxidizing agent such as Al in tapping process. Its characters are as followsú‘adding Si-Ba-Ca alloy as deoxidizing agent to molten steel when tapping from converterú¿weight percentage of each component is Si 52-65ú¼ Ca í¦14ú¼Baí¦14ú¼Alíœ2ú¼Síœ0.15ú¼Píœ0.05 ú”granularity 10-50mmú”specific density 3.2g / cm3ú®. The deoxidizing agent is suggested to add into ladle with other alloy when the tapping percentage is in between 1 / 4 and 1 / 3. There are no Ba inclusion in finished steel and content of large-grained inclusion in finished steel decreased evidently because Baí»s great atomic radius made itself easier oxidated so that almost all the Ba were turned into slag. This technique could control the content of AlT íœ 0.002úÑin finished steel so as to prevent reoxidation of molten steel in continuous pouring process effectively and improve cleanliness of molten steel and increase numbers of pouring convertors. Ití»s highly suitable for pouring light section continuous casting billet and 82B steel for steel strand that requires superheat degree of molten steel more strictly.

Description

[0001] Field [0002] The invention belongs to the field of steelmaking, and is mainly applicable to the deoxidation method of 82B converter molten steel used for smelting steel strands under continuous casting of 130mm billets, low superheat and stable production conditions. Background technique [0003] The deep processing performance of 82B wire rod for steel strand and its use in major key projects require that the content of inclusions in this steel is low, the total oxygen content is not more than 30ppm, the inclusions are easy to deform and the particle size is less than 6μm, and the steel must be strictly controlled. Aluminum oxide content of non-metallic inclusions. [0004] The purpose of deoxidation operation is to reduce the total oxygen content in the steel. At present, the deoxidizers commonly used in domestic and foreign steel mills to smelt steel 82B for steel strands include Al-Fe, Si-Ca-Ba-Al, and Si-Ca. For the 82B continuous casting slab with small cross-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 章军李本海李永东王全礼曾立王坚朱殷翔丰国庆李飞王彦锋周德
Owner SHOUGANG CORPORATION
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