Manufacturing method of thin-strip continuous casting low-carbon micro-alloy steel strip

Abstract

The invention discloses a manufacturing method of a thin-strip continuous casting low-carbon micro-alloy steel strip. The manufacturing method comprises the following steps of: (1) casting a cast strip with the thickness of 1-5mm in a double-roll continuous casting machine, wherein the steel strip comprises the following chemical components in percentage by weight: 0.01-0.25 percent of C, less than or equal to 0.4 percent of Si, 0.6-2.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.012 percent of N and further comprises at least one of 0.005-0.1 percent of Nb, 0.005-0.1 percent of V, 0.005-0.1 percent of Ti, 0.05-0.5 percent of Mo, and the balance of Fe and inevitable impurities; (2) cooling the cast strip, wherein the cooling rate is greater than 20 DEG C / s; (3) performing hot rolling, wherein the hot rolling temperature is 1,050-1,250 DEG C, the reduction rate is 20-50 percent, and the deformation rate is greater than 20 s<-1>; and (4) cooling, wherein the cooling rate is 10-80 DGE C / s; and (5) coiling, wherein the cooling temperature is 550-700 DEG C. According to the manufacturing method, austenite is re-crystallized on line after the hot rolling of the cast strip is realized, so that a product obtains a small size of ferrite and pearlite structure which is more uniformly distributed, and meanwhile the product simultaneously has high strength and extensibility.

Description

technical field [0001] The invention relates to thin strip continuous casting technology, in particular to a thin strip continuous casting low-carbon microalloy steel strip manufacturing method. Plastic matching, the microstructure of the obtained steel strip is mainly composed of fine polygonal ferrite and pearlite. 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...

AI Technical Summary

Problems solved by technology

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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