Ultralow-carbon bake-hardened steel plate blank and control method of solid solution carbon content thereof

A baking hardening and control method technology, applied in the manufacture of converters, etc., can solve the problems of low solid solution carbon content in one smelting hit rate, shorten the smelting time of vacuum refining furnace, and long smelting time, so as to reduce the vacuum refining time, Improvement of hardening performance and reduction of production cost

Active Publication Date: 2015-09-30
SHOUGANG JINGTANG IRON & STEEL CO LTD
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Problems solved by technology

[0004] The embodiment of the present application provides an ultra-low-carbon bake-hardening steel slab and a method for controlling its solid solution carbon content, which solves or partially solves the problem that the production method of ultra-low-carbon bake-hardening steel in the prior art cannot control carbon well. The

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  • Ultralow-carbon bake-hardened steel plate blank and control method of solid solution carbon content thereof

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Example Embodiment

[0082] Example one

[0083] The method for controlling the solid solution carbon content of ultra-low carbon bake hardening steel provided by the embodiment of the present invention is used to produce bake hardening steel CR180BH. The conditions of molten steel entering the RH furnace are: C content 0.031%; Si content 0.005%; S content 0.007%; P content 0.031%; Mn content 0.02%; temperature 1625°C; oxygen content 650ppm.

[0084] The temperature and oxygen content are appropriate, and there is no need to blow oxygen or add scrap steel. After refining for 3 minutes, ferrophosphorus and ferromanganese were added according to the target P content of 0.036% and the target Mn content of 0.35%. After adjusting the alloy for 4 minutes, sample and analyze the content of P and Mn; obtain P content of 0.037%, Mn content of 0.31%; RH treatment for 15 minutes, fixed oxygen value of 425ppm; after oxygen is fixed, adjust phosphorus iron according to the target value, adjust aluminum particles, ...

Example Embodiment

[0088] Example two

[0089] The method for controlling the solid solution carbon content of ultra-low carbon bake hardening steel provided by the embodiment of the present invention is used to produce bake hardening steel CR180BH. The conditions of molten steel entering the RH furnace are: C content 0.025%; Si content 0.005%; S content 0.007%; P content 0.031%; Mn content 0.02%; temperature 1646°C; oxygen content 481ppm.

[0090] 30Nm oxygen blowing at the beginning of RH treatment 3 , The deep decarburization process adds 1.9t of low-carbon scrap. After refining for 3 minutes, ferrophosphorus and ferromanganese were added according to the target P content of 0.036% and the target Mn content of 0.35%. After adjusting the alloy for 4 minutes, sample and analyze the content of P and Mn; obtain P content of 0.037%, Mn content of 0.31%; RH treatment for 15 minutes, fixed oxygen value of 425ppm; after oxygen is fixed, adjust phosphorus iron according to the target value, adjust aluminu...

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Abstract

The invention relates to an ultralow-carbon bake-hardened steel plate blank which comprises the following chemical components in percentage by weight: 0.0015-0.0030% of C, at most 0.03% of Si, 0.30-0.60% of Mn, 0.030-0.050% of P, at most 0.015% of S, 0.015-0.060% of Alt, 0.005-0.025% of Nb, at most 0.0050% of N, 0.0005-0.0020% of B and the balance of Fe. The invention also relates to of a control method of the solid solution carbon content of the ultralow-carbon bake-hardened steel, which comprises the following steps: sequentially carrying out pre-desulfurization and slag removal treatment on molten iron to obtain first molten iron with the sulfur content of at most 0.003%; smelting the first molten iron to obtain first molten steel with the carbon content of 0.025-0.050%; refining the first molten steel by a vacuum refining furnace to obtain second molten steel; sending the second molten steel into a continuous casting procedure, injecting into a carbon-free tundish, and casting the molten steel to obtain the ultralow-carbon bake-hardened steel plate blank, wherein the carbon increase amount of the second molten steel in the continuous casting process is at most 0.0003%. The control method shortens the smelting time in the vacuum refining furnace, enhances the production efficiency, and enhances the primary smelting hit rate of the plate blank composition.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to an ultra-low carbon bake hardened steel slab and a method for controlling the solid solution carbon content thereof. Background technique [0002] Bake hardening value is an important performance index of bake hardening steel. The solid solution carbon content has a great influence on the bake hardening value, especially for ultra-low carbon bake hardenable steels. Therefore, in the development process of ultra-low carbon bake-hardening steel, the requirements for solid solution carbon content are generally very strict, and the error range of the target value is as narrow as ±0.0003% by mass. The solid solution carbon content is mainly controlled by the carbon content and the content of alloying elements such as Nb, and is generally controlled by adjusting the amount of Nb alloy added according to the carbon content. [0003] The production method of ultra-low carbon bake-h...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04C21C7/10C21C1/02C21C7/068C21C5/28
Inventor 陈玉鑫刘建华王莉彭国仲田志红黄财德黄俊詹美珠王胜东白健卢家凯陈守关田贵昌乔焕山徐永先黄来情李向奎安超李欢罗磊李仕儒
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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