A method for manufacturing age-hardening thin strip continuous casting low-carbon micro-alloy high-strength steel strip
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A technology of age hardening and manufacturing methods, applied in the field of thin strip continuous casting technology, can solve the problems of reducing production line advantages, increasing the floor area of thin strip continuous casting and rolling production lines, increasing investment costs, etc.
Active Publication Date: 2015-09-23
BAOSHAN IRON & STEEL CO LTD
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This not only increases the investment cost, but also significantly increases the floor area of the thin strip continuous casting and rolling production line, reducing the advantages of the production line
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[0093] see figure 1 , the strip continuous casting process of the present invention is: the molten steel in the ladle 1 passes through the long nozzle 2, the tundish 3 and the submerged nozzle 4, and is poured into the water-cooled crystallization roller 5a, 5b and the side seal by two relative rotations. In the melting pool 7 formed by the plates 6a, 6b, a 1-5mm casting belt 11 is formed through the cooling of the water-cooled crystallization roller, and the casting belt passes through the secondary cooling device 8 in the airtight chamber 10 to control its cooling rate. Roller 12 sends cast strip to hot rolling mill 13, forms 0.5-3mm hot rolled strip after hot rolling, then passes through cooling device 14 three times, and then hot rolled strip enters coiler 15. After the steel coil is removed from the coiler, it is naturally cooled to room temperature.
[0094] The molten steels of Examples 1-10 of the present invention were obtained by smelting in an electric furnace, and...
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Abstract
The invention discloses a manufacturing method of age-hardened thin-strip casting low-carbon microalloyed steel strip. The method comprises the following steps of: 1) smelting, and continuously casting a thin strip, wherein the weight percents of the components are as follows: 0.01-0.25% of C, not more than 0.4% of Si, 0.6-2.0% of Mn, not more than 0.015% of P, not more than 0.01% of S, not more than 0.006% of N, not more than 0.008% of O, 0.0005-0.004% of B, 0.005-0.1% of Nb, 0.005-0.1% of V, 0.005-0.1% of Ti, and 0.05-0.5% of Mo, and the balance of Fe and unavoidable impurities, and the casting thickness in the dual-roller continuous casting machine is 1-5mm; 2) cooling the cast strip, wherein the cooling rate is more than 20DEG C / s; 3) hot-rolling at 1050-1250 DEG C, wherein the reduction rate is 20-50%, and the deformation rate is more than 20s-1; 4) cooling, wherein the cooling rate is 10-80DEG C / s; 5) reeling at 550-700 DEG C; 6) performing age-hardening treatment, wherein the age-hardening temperature is 500-800 DEG C, and the heating time is 0.1-30 minutes. The austenite online recrystallization of the cast strip after hot-rolling is realized, the obtained steel strip is provided with uniformly distributed bainite and acicular ferrite, the structure comprises nanoscale precipitation such niobium carbonitride, and a product has high strength and extensibility.
Description
technical field [0001] The present invention relates to a thin strip continuous casting process, in particular to a method for manufacturing an age-hardened thin strip continuous casting low-carbon micro-alloy high-strength steel strip. %, with excellent strong plasticity matching. Background technique [0002] At present, the production of low-carbon high-strength thin-gauge steel strip products containing microalloying elements such as Nb, V, Ti, and Mo is mainly realized through traditional hot rolling and cold rolling processes. However, there are some problems in the production by traditional hot rolling or cold rolling process. [0003] First of all, the traditional process is long, high energy consumption, many units and equipment, and high infrastructure costs, resulting in high production costs. [0004] Secondly, when using the traditional hot rolling process to produce micro-alloyed high-strength thin-gauge products containing micro-alloying elements such as Nb,...
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