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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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.
Application Domain
Manufacturing converters
Technology Topic
SlagHardened steel +6
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