Strip steel cooling control method capable of combining ultra fast cooling with conventional laminar cooling
A laminar flow cooling and cooling control technology, applied in temperature control, workpiece cooling device, metal rolling, etc., can solve problems such as shortening of effective cooling length and inability to meet the coiling temperature process
Active Publication Date: 2019-12-31
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +1
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Problems solved by technology
[0004] Due to the shortened effective cooling length of the original laminar flow cooling, the original laminar flow mode will not be able to meet the requirements of the coiling temperature process
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Embodiment
[0046] Example: The common carbon steel Q235B process requires a finish rolling temperature of 880°C and a coiling temperature of 620°C, respectively introducing ideas for feedback control of high-pressure mode and low-pressure mode cooling.
[0047] High-pressure control mode: starting from the final rolling temperature control of 880°C, according to the actual temperature deviation of the strip surface detected by the ultra-fast cooling pyrometer, the number of valve openings in the rough cooling section and the finishing cooling section is controlled by feed-forward, and the feedback control adjusts the ultra-fast The number of open valves in the cold section; according to the temperature deviation of the strip surface detected by the coiling pyrometer, the feedback control adjusts the number of open valves in the fine cooling section to meet the coiling temperature of 620°C required by the process.
[0048] Low-pressure control mode: starting from the final rolling temperat...
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The invention discloses a strip steel cooling control method capable of combining ultra fast cooling with conventional laminar cooling. The strip steel cooling control method comprises the following steps: a control system divides the entire area into three parts namely an ultra fast cooling section, a laminar cooling coarse cooling section and a laminar cooling refined cooling section sequentially in the steel plate rolling moving direction on a rolling line; the control system carries out segmented cooling on the strip steel according to different water spraying quantities of each cooling sections; temperature detecting devices for detecting the surface temperature of the strip steel are arranged in front of the ultra fast cooling section, between the outlet of the ultra fast cooling section and the laminar cooling coarse cooling section, between the laminar cooling coarse cooling section and the laminar cooling refined cooling section, and behind the laminar cooling refined coolingsection; before cooling, the strip steel sequentially passes through the ultra fast cooling section, the coarse cooling section and the refined cooling section; and the actual temperature detected bythe temperature detecting device behind each cooling section is utilized to carry out feedback control so as to improve the temperature control precision of each cooling section.
Description
technical field [0001] The invention relates to the technical field of strip steel cooling after rolling, in particular to a strip steel cooling control method combining ultrafast cooling and conventional laminar flow cooling. Background technique [0002] In the hot continuous rolling production process, the coiling temperature of the strip steel plays a decisive role in the microstructure and mechanical properties of the product. In order to increase the market competitiveness of the enterprise, the ultra-fast cooling control system is usually added separately to meet the requirements of reducing the existing structural steel, The cost of pipeline steel and other products, improve the product process means, provide process technology and equipment support for the hot strip steel production line products to have the potential of universal reduction process, and realize the low cost of common carbon low alloy, pipeline and other products The performance is stable and smooth,...
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IPC IPC(8): B21B37/76B21B45/02
CPCB21B37/76B21B45/0218B21B45/0233B21B2261/20
Inventor 尹锋范礼松
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD