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Improvement of impurities state in steel from calcium silicate

A technology of wollastonite and inclusions, which is applied in the field of out-of-furnace refining of molten steel for high-quality high-carbon hard wire, can solve the problems of failing to propose a specific slagging method, and achieve good plasticity, improved drawing performance, and low melting point Effect

Active Publication Date: 2007-09-19
SHOUGANG CORPORATION
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Problems solved by technology

The low-basic refining slag that keeps the basicity of refining slag at about 1, Chinese patent 98101690.1 can improve the cleanliness of molten steel and reduce the content of gas and inclusions in steel, but it only briefly mentions the modification of inclusions However, no specific slagging method can be proposed in combination with the modification mechanism of inclusions in the refining process

Method used

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Embodiment Construction

[0016] In the process of producing steel LX72A for steel cord, this new slagging process is adopted in the 80tLF refining furnace, the amount of slag in the converter is 10kg / t steel, and the refining cycle is 50min. After tapping, add the mixture of wollastonite, Si-Fe powder and fluorite to the ladle as top slag, the addition amount is 800kg / furnace, the specific ratio is: wollastonite 90%, Si-Fe powder 5%, fluorite 5%, its chemical composition is as follows (percentage by weight): CaO 45.25%, SiO 2 49.96%, Al 2 o 3 0.84%, MgO 1.12%.

[0017] After adopting the new slag refining process, LF refining final slag Al 2 o 3 The content is 8.0-11.0%, and the specific refining final slag components are shown in Table 1.

[0018] Through the new slagging process, the shape of the inclusions is changed from spherical CaO-SiO 2 -Al 2 o 3 Mainly into irregular shape SiO 2 -Fe 2 o 3 , the inclusions contain Al 2 o 3 Greatly reduced, the size of the inclusions was signific...

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Abstract

A method of improving steel inclusion conformation by using wollastonite and a refining technique by adding mixture of wollastonite ore, Si-Fe powder and fluorite to ladle to obtain refining slag with lower alkalinity and lower Al2O3 inclusion. High Carbon Steel for Wires with high quality,in which the alkalinity of refining slag was kept at about 1 and content of Al2O3 in refining slag was kept in the range of 8.0%~11.0%, can be produced by this technique. As a result, generated inclusion would float adequately so that its content in steel would reduce, and content of Al2O3 in refining slag would be kept at an adequate value so that inclusion would be modified. Advantages of this refining technique are as follows: non-deformed inclusion such as Al2O3 was reduced, anorthite inclusion with lower melting point and better plasticity can be obtained, the dimension of inclusion minish obviously so that both the plasticity and drawing capacity of steel are enhanced greatly.

Description

[0001] Field [0002] The invention belongs to the field of steelmaking and is mainly suitable for the out-of-furnace refining of molten steel for high-quality high-carbon hard wire. Background technique [0003] The quality of steel products required by modern iron and steel metallurgical production is getting higher and higher, and the requirements for the cleanliness of molten steel are also getting higher and higher. The allowable size of inclusions in ordinary high-carbon hard wire steel is 10 μm, and the requirement for high-quality hard wire steel is higher, reaching 5 μm; non-deformable inclusions will cause the wire rod to break during the drawing process, seriously affecting the quality of the steel. Even when the total oxygen content in the steel is low, the content of aluminum oxide in the non-metallic inclusions in the steel must be strictly controlled to achieve the purpose of changing the shape of the inclusions. [0004] High-quality high-carbon hard wire stee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
Inventor 章军李本海李永东王全礼李飞周德光王坚朱殷翔郭亮王彦锋周德
Owner SHOUGANG CORPORATION
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