Ultra-clean low-carbon low-silicon steel wire rod controlled rolling process

Abstract

The invention discloses an ultra-clean low-carbon low-silicon steel wire rod controlled rolling process which solves the problems of misroll, folding, poor control of format dimensions, high rejection rate, unfavorable production cost control, and the like in the rolling process of ultra-clean low-carbon low-silicon steel wire rods. The rolling process comprises spinning, volume collecting, checking and warehousing after rough rolling, medium rolling and fine rolling on steel blanks. The heating temperature of the rolling is 950 to 1000 DEC G, and the initial rolling temperature is 880 to 930DEG C. The fine rolling comprises pre-fine rolling and fine rolling, and the final four roll gaps for controlling fine rolling machines sequentially are 2.3 to 2.35mm, 1.42-1.47mm, 1.55-1.60mm and 1.1-1.15mm. The invention greatly improves the quality of the ultra-clean low-carbon low-silicon steel wire rods and has the advantages of simple process, simple and convenient operation and low rejection rate.

Description

technical field [0001] The invention relates to a steel production process, in particular to an ultra-clean low-carbon low-silicon steel wire rod controlled rolling process. Background technique [0002] There are many domestic and foreign research reports on wire rod controlled rolling technology, especially the United States and Japan have done more research in this area, and have obtained a series of patents. At home and abroad, at this stage, the controlled rolling technology of wire rod is mostly researched on a certain item, such as low temperature rolling, adjusting roll gap, improving pass shape, etc. For example, in order to greatly improve the strength and toughness of steel, develop varieties that meet different requirements, improve steel quality, and reduce production costs, Angang has developed and trial-produced Φ8-Φ12mm super steel wire rods on high-speed wire rod rolling mills. By adjusting the chemical composition, and adopting controlled rolling and contr...

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Problems solved by technology

[0003] However, due to the special chemical composition of the ultra-clean low-carbon low-silicon steel wire rod, which is also a wire rod, that is, the content of C and Si is low (C≤0.10%, Si≤0.05%), and the content of P and S is extremely low (≤0.10%) %,), making the resistance to denaturation small; and the rolling specifications are mainly small specifications of Φ6.5mm and Φ5.5mm, the deformation rate is high, the temperature rises faster during the rolling process, and the wire rod specification control and surface quality control have comparative advantages. It is very difficult, and the product quality cannot be guaranteed by traditional rolling technology. During the rolling process, problems such as rolling waste, folding, and poor control of specifications and sizes are easily generated.

Due to the low deformation resistance, during rolling, the rolled piece has an overfilling phenomenon in the pass of the rolling mill, that is, after the steel is pressed by force in the pass, it expands in the non-stressed direction larger than the general steel type, thus causing the rolled piece The deformation in the non-stressed direction in the pass is too large, and it is in an overfilled state, which causes surface defects of the rolled piece, resulting in a high rejection rate (the rejection rate is at least 2.5%)

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