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A method for making semi-processed cold rolled silicon steel in thin slab continuous casting and continuous rolling process

A thin slab continuous casting and cold-rolling silicon steel technology, which is applied to the improvement of process efficiency, metal rolling, and tool manufacturing, can solve the problems of low casting slab yield, many process links, and large equipment investment, so as to reduce the process Links, save equipment investment, reduce the effect of equipment investment

Active Publication Date: 2006-11-22
湖南华菱涟钢特种新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of producing semi-process silicon steel is to use molten iron pretreatment - top and bottom combined blowing converter - vacuum treatment - thick slab continuous casting - heating furnace reheating - rough rolling unit - continuous rolling unit - pickling - continuous rolling or single stand reciprocating Cold rolling-annealing-tempering process, this process technology is mature, but there are still problems in this process, such as large equipment investment and many process links, especially the reheating of the casting slab after cooling, high energy consumption, and low casting slab yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Pour molten iron from the blast furnace into an oxygen top-bottom compound blowing converter, and at the same time, add steel scrap accounting for 10% of the total weight into the converter furnace. Add lime, dolomite and fluorite to the converter during the blowing process, so that the binary basicity of the final slag is R=2.8; 3 / min.t 钢 . When the end point composition of molten steel [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and the end point temperature of molten steel is 1650°C, tap the steel with fixed oxygen; add 1.2kg to the ladle when tapping the converter / t 钢液 Composite deoxidizer such as barium-silicon alloy and 1.8kg / t 钢液 The metal aluminum block deoxidizes the molten steel initially. After the initial deoxidation of the molten steel, the dissolved oxygen content in the molten steel is 100ppm; then add 2.5kg / t to the molten steel 钢液 Metal manganese, make molten steel [Mn] = 0.35%, add 2.0kg / t to molten steel 钢液 For ferrosilicon, add ferrophosphorus to make [...

Embodiment 2

[0036] The blast furnace molten iron is poured into an oxygen top-bottom compound blowing converter, and at the same time, steel scrap accounting for 20% of the total weight is mixed into the converter furnace. Add lime, dolomite, and fluorite to the converter during the blowing process, so that the binary basicity of the final slag is R=1.5; 3 / min.t 钢 . When the end point composition of molten steel [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and the end point temperature of molten steel is 1680°C, tap the steel with fixed oxygen; add 2.5kg to the ladle when tapping the converter / t 钢液 Composite deoxidizer such as silicon-calcium alloy and 0.2kg / t 钢液 The metal aluminum block deoxidizes the molten steel initially. After the initial deoxidation of the molten steel, the dissolved oxygen content in the molten steel is 225ppm; then add 0.6kg / t to the molten steel 钢液 Metal manganese, make molten steel [Mn] = 0.20%, add 3.5kg / t to molten steel 钢液 For ferrosilicon, add ferrophosphorus to...

Embodiment 3

[0039] Pour the hot metal from the blast furnace into the oxygen top-bottom compound blowing converter, use the whole hot metal for smelting, do not add scrap steel, add lime, dolomite and fluorite to the converter furnace during the blowing process, so that the binary alkalinity of the final slag is R=4.0 ;The converter adopts the whole process of bottom blowing argon, and the intensity of bottom blowing argon is ≥0.03Nm 3 / min.t 钢 . When the end point composition of molten steel [C]≤0.02%, [P]≤0.035%, [S]≤0.015% and the end point temperature of molten steel is 1700°C, tap the steel with fixed oxygen; add 0.20kg to the ladle when tapping the converter / t 钢液 Composite deoxidizer such as silicon aluminum calcium alloy and 3.5kg / t 钢液 The metal aluminum block deoxidizes the molten steel initially. After the initial deoxidation of the molten steel, the dissolved oxygen content in the molten steel is 30ppm; then, add 4.5kg / t to the molten steel 钢液 Metal manganese, make molten s...

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Abstract

The invention relates to a method for using sheet blank continuous casting continuous rolling to produce silicon steel. In the BOF smelt process, it uses bottom argon blow technique in the whole processes; adds composite deoxidant and aluminum into steel pack when outputting steel to remove oxygen; adds manganese, silicon steel and ferro-phosphorus to alloy; blows argon to the melt steel in all process; uses LF furnace to refine the melt steel; using CSP continuous casting machine to cast the melt steel into casting blank; heats the casting blank via TF furnace to be rolled by continuous rolling machine to be hot rolling sheet coil; acid washes hot rolling plate to be cold rolled via rough roller cold rolling machine to be cold rolled sheet coil; anneals via the anneal furnace; flattens the annealed sheet coil via flatten machine group while the extending rate is 2-18%; corrects the sheet shape via correct machine; packs and stores the coil into the storehouse. The inventive method can reduce the cost of producing device and improve the additive value of sheet blank continuous casting continuous rolling product.

Description

technical field [0001] The invention relates to a production method, in particular to a method for producing semi-process cold-rolled silicon steel for electromagnetic elements in a thin slab continuous casting and rolling process. Background technique [0002] Semi-process silicon steel belongs to low-carbon and low-silicon cold-rolled non-oriented electrical steel. It has low iron loss, high magnetic induction intensity and good punching performance. Developed countries such as the United States began to produce and use low-temperature steel as early as the 1960s. Carbon low-silicon non-oriented semi-process silicon steel, this type of steel may not be annealed or incompletely annealed, and does not require coating treatment. Users can directly punch sheets and perform decarburization annealing treatment according to the design requirements of various electromagnetic components. It can enter the market after bluing (insulation layer) treatment. This product has the advanta...

Claims

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Application Information

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IPC IPC(8): B21B1/46B21B37/00B21B45/02B22D11/16B22D41/00C21C5/30C21C7/04C21C7/06C21C7/076
CPCY02P10/20
Inventor 吴光亮郑柏平焦国华
Owner 湖南华菱涟钢特种新材料有限公司
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