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Continuous casting and rolling process for producing thin IF billet

A thin slab continuous casting and production process technology, applied in metal rolling, manufacturing tools, tension/pressure control, etc., can solve the problems of inability to provide deep drawing cold rolling and galvanized sheet raw materials, and achieve good economic benefits

Active Publication Date: 2007-06-06
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to reasons such as equipment configuration and immature technology, there is no precedent for the production of ultra-low carbon IF steel in domestic thin slab continuous casting and rolling production lines, and it is impossible to provide a large number of raw materials for deep drawing cold rolling and galvanized sheet that are urgently needed by the market.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: The blank is passed through the converter smelting process and the LF furnace refining process, and the weight components of molten steel are controlled to be C: 0.0042%; Si: 0.067%; Mn: 0.12%; P: 0.012%; S: 0.0010; Als: 0.040% ; Ca: 0.0028%; N: 0.0025%; Ti: 0.0450%. After being heated to 1130°C through a tunnel furnace, it is rolled in a 7-stand continuous rolling unit. The starting rolling temperature is 1050°C; the final rolling temperature is 850°C. The relative reduction rate of the 2nd frame is 55%; the 3rd to 5th frame is 35%; the 6th frame is 29%; the 7th frame is 20%, and the thickness specification of hot rolling is 1.8mm. After rolling, it is cooled to 650°C for coiling. It is rolled into 0.35mm chilled coils by 4-stand continuous cold rolling, and sent to the subsequent bell annealing + tempering or hot-dip galvanizing production line to produce cold-rolled and galvanized steel coils.

Embodiment 2

[0014] Example 2: The blank is passed through the converter smelting process and the LF furnace refining process, and the weight components of the molten steel are controlled to be C: 0.0043%; Si: 0.049%; Mn: 0.10%; P: 0.011%; S: 0.0013; Als: 0.051% ; Ca: 0.0051%; N: 0.0045%; Ti: 0.0600%. After being heated to 1135°C in a tunnel furnace, it is rolled in a 7-stand continuous rolling unit. The starting rolling temperature is 1060°C; The relative reduction rate of the 2nd frame is 57%; the 3rd to 5th frame is 37%; the 6th frame is 29%; the 7th frame is 18%, and the thickness specification of hot rolling is 2.0mm. After rolling, it is cooled to 670°C for coiling. It is rolled into 0.7mm chilled coils by 4-stand continuous cold rolling, and then sent to the subsequent bell annealing + tempering or hot-dip galvanizing production line to produce cold-rolled and galvanized steel coils.

Embodiment 3

[0015] Example 3: The blank is passed through the converter smelting process and the LF furnace refining process, and the weight components of the molten steel are controlled to be C: 0.0045%; Si: 0.041%; Mn: 0.11%; P: 0.010%; S: 0.0010; Als: 0.054% ; Ca: 0.0020%; N: 0.0034%; Ti: 0.0740%. After being heated to 1140°C in a tunnel furnace, it is rolled in a 7-stand continuous rolling unit. The starting rolling temperature is 1070°C; The relative reduction rate of the 2nd frame is 59%; the 3rd to 5th frame is 39%; the 6th frame is 22%; the 7th frame is 17%, and the thickness specification of hot rolling is 3.0mm. Cool to 690°C after rolling. It is rolled into 1.2mm chilled coils by 4-stand continuous cold rolling, and then sent to the subsequent bell annealing + tempering or hot-dip galvanizing production line to produce cold-rolled and galvanized steel coils.

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PUM

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Abstract

The continuous casting and rolling process for producing IF sheet billet includes the steps of converter smelting, LF furnace refining and continuous casting and rolling. The molten steel consists of C 0-0.0050 wt%, Si 0-0.03 wt%, Mn 0-0.60 wt%, P 0-0.015 wt%, S 0-0.010 wt%, Ti 6-10 times C+N, and Fe and inevitable impurity for the rest. Compared with available technology, the present invention has the advantages of expanded application range, etc. The IF sheet billet may be used in automobile, appliance, etc.

Description

Technical field: [0001] The invention belongs to the technical field of thin slab continuous casting and rolling technology, especially the technical field of thin slab continuous casting and rolling technology for producing IF steel. Background technique: [0002] Thin slab continuous casting and rolling process, as one of the new manufacturing processes of plate and strip products in the iron and steel industry, has developed rapidly at home and abroad in recent years. However, due to reasons such as equipment configuration and immature technology, domestic thin slab continuous casting and rolling production lines have no precedents for producing ultra-low carbon IF steel, and cannot provide a large number of deep-drawing cold-rolled and galvanized sheet raw materials urgently needed by the market. Invention content: [0003] The technical problem to be solved by the present invention is to provide a production process of thin slab continuous casting and rolling line to ...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B1/46B21B37/74B21D5/00B21B37/48C21D8/02C21D11/00
Inventor 张建平朱涛杨兴亮沈昶陈友根董梅裴陈新史怀言王勇刘坤谭凌彭荣才
Owner MAANSHAN IRON & STEEL CO LTD
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