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Hot loading method for medium-thick slabs

A thick slab, hot charging technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of slab fracture, thermal stress difference, uneven heating in the heating furnace, etc., to reduce the probability of scrap and thermal conductivity. Good, no-investment results

Active Publication Date: 2013-01-09
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because some steel types, such as medium-high carbon, low-alloy high-strength steel, are relatively brittle and hard due to the high content of carbon or other alloy elements in the steel, when the temperature is low, the billet at room temperature is loaded into the heating furnace. Due to the rapid temperature rise of the slab in the heating furnace, there is an uneven temperature rise between the surface and the interior of the slab, and there is a large difference in thermal stress between the surface and the interior of the slab, which may cause the slab to break in the heating furnace, especially in cold season, the probability of occurrence is higher

Method used

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  • Hot loading method for medium-thick slabs

Examples

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Effect test

Embodiment 1

[0032] The 250mm×2200mm×7200mm high-quality carbon structural steel medium-thick plate high-temperature billet produced by continuous casting in a steel plant is transported to the rolling mill through the conveying roller table, and the billet is hoisted to the slow cooling site of the wide-plate factory for stacking. The surface temperature of the slab is 750-850°C. The normal-temperature slabs are medium-thick slabs of the same steel type and size. The normal-temperature slabs and the high-temperature slabs are stacked alternately by sandwiching a cold slab between two hot slabs. There are 4 stacks in total. 7 high-temperature slabs and 3 normal-temperature slabs are stacked in each pile. When the slabs are stacked for 12 hours, the side temperature of the high-temperature slab after slow cooling is 580-630°C, and that of the normal-temperature slab after preheating is 450~500°C; After the billets are stacked for 14 hours, they are loaded into the heating furnace. First, t...

Embodiment 2

[0034] The 250mm×2200mm×7200mm high-quality carbon structural steel medium-thick plate high-temperature billet produced by continuous casting in a steel plant is transported to the wide-plate rolling mill through the conveying roller table, and the cast billet is hoisted to the slow-cooling site of the wide-plate factory for stacking and stacking The surface temperature of the slab is 800-850℃, and the slab at room temperature is 250mm×2200mm×3400mm low-alloy structural steel medium-thick slab. pile up. There are 2 piles in total, each with 7 pieces of high-temperature billets and 6 pieces of normal-temperature billets. When the billets are stacked for 12 hours, the side temperature of the high-temperature billets is 530-610°C after slow cooling, and the billets at room temperature are preheated. The temperature of the rear side is 430-530°C; after the slabs are stacked for 14 hours, they are loaded into the heating furnace. Slowly cooled slabs; the slab conveying roller tabl...

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Abstract

The invention relates to a hot loading method for medium-thick slabs. The method includes: cutting the medium-thick slabs into specific lengths, conveying for rolling, using a traveling vehicle to hang high-temperature slabs to a slow cooling stacking position, placing normal-temperature medium-thick slabs on the high-temperature slabs, stacking in a way that a normal-temperature medium-thick slab is placed between two high-temperature slabs and the topmost piece of each stack is a high-temperature slab for 10-14 hours until each high-temperature slab is cooled to the required uppermost limit of hot loading and each normal-temperature medium-thick slab is preheated to the required lowermost limit of hot loading, and loading the slabs into a heating furnace. Normal-temperature medium-thick slabs are preheated by heat released by high-temperature slabs during slow cooling to reach a surface temperature of more than 400-550 DEG C so as to achieve hot loading. Waste heat of the high-temperature slabs are utilized to the maximum limit and fine energy conservation effect is achieved. A novel method for preheating normal-temperature slabs outside the furnace is created, and fracture of the slabs due to normal-temperature slabs are heated in the heating furnace can be avoided.

Description

technical field [0001] The invention belongs to the technical field of energy-saving metal material processing, and relates to a hot charging method for a medium-thick slab. Background technique [0002] Continuous casting slab hot charging is a continuous, energy-saving and production cost-reducing technology for steel production, and has become an important indicator to measure the technical level of steel production. The hot-charging method of continuous casting slabs is that the high-temperature casting slabs cut by steelmaking and continuous casting are immediately transported to the rolling process through roller tables or other facilities, and directly loaded into the heating furnace, or slowly cooled first, and the temperature of the high-temperature continuous casting slabs drops to After a certain temperature range, if the surface temperature of the slab is not higher than 650°C, it is then loaded into the heating furnace. Because the temperature of the high-tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/20C21D9/70B21B15/00
Inventor 张志明何矿年李桦宋建桥丘文生黄锐方彪
Owner SGIS SONGSHAN CO LTD
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