Process for producing hot-rolled sheet for cold-rolling and punching

A production process and thin plate technology, which is applied in the field of C21C5/28, hot-rolled thin plate production process for cold-rolled stamping, can solve the problems of not very ideal process flow, high production efficiency, high production cost, etc., to shorten the production process flow, The effect of improving production efficiency and reducing production cost

Inactive Publication Date: 2006-10-25
LIANYUAN IRON & STEEL GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method has mature technology and stable product quality, while the second method has relatively less investment, higher production efficiency than the first method, and relatively low production cost. The disadvantage of these two methods is that the process flow is long , high investment, high production cost, is a not very ideal process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] It is smelted in a 100t oxygen top-bottom composite blowing converter. Pour out the residue of converter slag splashing protection furnace, then pour untreated molten iron into the converter, add scrap steel, adopt double slag operation, and control the oxygen supply intensity at 6.5m in the early stage of smelting 3 / t 钢 .min, the oxygen lance is 1.8m above the liquid level of the converter molten pool, and 80kg / t is added to the converter 钢 Lime, and add 10kg / t 钢 Iron oxide scale, adding flux fluorite 1.0kg / t 钢 , control the binary basicity R in the generated slag once to R=2.0, control the blowing time in the early stage at 4 minutes, pour out the high-phosphorus slag and high-silicon slag once; add 30kg / t 钢 Lime, add fluorite 10kg / t 钢 , create secondary new slag, the oxygen lance is 0.6m above the liquid surface of the molten pool, and the oxygen supply intensity is 4.0m 3 / t 钢.min, binary alkalinity in the final slag R=4.5, blowing time 8min.

[0029] It is ...

Embodiment 2

[0034] It is smelted in a 100t oxygen top-bottom composite blowing converter. Pour out the residue of converter slag splashing protection furnace, then pour untreated molten iron into the converter, add scrap steel, adopt double slag operation, and control the oxygen supply intensity at 4.0m in the early stage of smelting 3 / t 钢 .min, the oxygen lance is 1.0m above the liquid surface of the converter molten pool, and 20kg / t is added to the converter 钢 Lime, and add 6kg / t 钢 Iron oxide scale, add fluorite 30kg / t 钢 , control the binary basicity R=1.0 in the slag generated once, control the blowing time in the early stage at 8min, pour out the high-phosphorus slag and high-silicon slag once; add 50kg / t 钢 Lime, add fluorite 30kg / t 钢 , create secondary new slag, the oxygen lance is 0.2m above the liquid surface of the molten pool, and the oxygen supply intensity is 2.0m 3 / t 钢 .min, the binary basicity R in the final slag is R=2.5, and the blowing time is 12 minutes.

[0035]...

Embodiment 3

[0040] It is smelted in a 100t oxygen top-bottom composite blowing converter. Pour out the residue of converter slag splashing protection furnace, then pour untreated molten iron into the converter, add scrap steel, adopt double slag operation, and control the oxygen supply intensity at 1.5m in the early stage of smelting 3 / t 钢 .min, the oxygen lance is 0.2m above the liquid surface of the converter molten pool, and 50kg / t is added to the converter 钢 Lime, and add 1.0kg / t 钢 Iron ore, adding chilled pellets 1.0kg / t 钢 , control the binary alkalinity R=3.0 in the slag generated once, the blowing time in the early stage is 20min, pour out the high-phosphorus slag and high-silicon slag once; add 10kg / t 钢 Lime, adding flux fluorite 0.0kg / t 钢 , make secondary new slag, the oxygen lance is 1.5m above the liquid surface of the molten pool, and the oxygen supply intensity is 6.0m 3 / t 钢 .min, the binary basicity R in the final slag is R=3.5, and the blowing time is 3min.

[0041...

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Abstract

The present invention discloses a production process of hot-rolled sheet for cold roll drawing operation. Said production process includes the following steps: smelting molten iron by using top and bottom double-blast converter, controlling oxygen supplying intensity, binary alkalinity and converting time, adopting double-slag operation, refining molten steel by using LF furnace, adding refining slag, in the refining process adding reaction inhibitor, adding alloy elements of boron, titanium and aluminium, making molten steel undergo the process of microalloying treatment, then making continuously-casting and continuously-rolling operation so as to obtain the invented hot-rolled sheet.

Description

technical field [0001] The invention relates to a production process of a billet, in particular to a production process of a hot-rolled thin plate for cold-rolling stamping, belonging to the C21C5 / 28 category. Background technique [0002] Hot-rolled sheet for cold-rolled stamping is an essential raw material for cold-rolled sheet production. At present, the methods of providing raw materials for cold-rolled plates are: ① Using traditional thick plate continuous casting process, such as molten iron pretreatment - converter (or electric furnace) smelting - LF furnace refining - vacuum treatment (RH or VD) - Thick slab continuous casting 250mm billet - rolling by hot rolling mill; ②Thin slab continuous casting and rolling process, such as molten iron pretreatment - converter (or electric furnace) smelting - LF furnace refining - vacuum treatment (RH or VD )——thin plate continuous casting 50~130mm billet——rolling by hot rolling mill. The first method has mature technology and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46C21C5/28
Inventor 吴光亮焦国华郑柏平温德智周春泉梁新亮戴开发孟征兵
Owner LIANYUAN IRON & STEEL GROUP CO LTD
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