Method for manufacturing super-thick super-huge single steel ingot

Abstract

The invention discloses a method for manufacturing a super-thick super-huge single steel ingot. In the invention, two original blanks are placed on a chassis in parallel, the upper parts of the two original blanks are respectively provided with a dead head, two side baffles are respectively arranged at two sides of the original blanks and the dead heads to form a solidification area to be melted; a consumable electrode is inserted in the solidification area to be melted, steel on the consumable electrode is slowly melted in the solidification area to be melted by using the traditional electroslag remelting technology, the steel is solidified at the same time of being melted till the solidification area to be melted is completely filled with the steel melted from the consumable electrode, and the two original blanks are welded together. Compared with electroslag remelting, the method has low production cost and high production efficiency; the internal quality of the super-thick super-huge single steel ingot manufactured with the method disclosed in the invention is higher than that of a super-huge single steel ingot manufactured with a die casting technology and continuous casting, and especially, the trends of center dispersion and center segregation can be reduced greatly. The method can be used for producing the super-thick super-huge single steel ingots, and the super-thick super-huge single steel ingots which are of a structure having different chemical components along thickness direction and can be used for manufacturing composite steel plates.

Description

technical field [0001] The invention relates to the production technology of extra-thick steel plates, in particular to a manufacturing method of extra-thick and extra-large single-weight steel ingots. Background technique [0002] The thickness and single weight of the blank determine the maximum thickness and maximum single weight of the finished steel plate, and the internal quality of the blank also directly affects the intrinsic quality of the finished steel plate. [0003] With the improvement of the country's comprehensive manufacturing capacity, the construction of major projects such as large-scale thermal power plants, large-scale hydropower plants, large-scale nuclear power plants, large-scale spherical tanks, and offshore drilling platforms in China is in the ascendant, and the scale is getting larger and larger. The construction of these major projects related to the national economy and people's livelihood requires a large number of steel plates. The steel pla...

AI Technical Summary

Problems solved by technology

Considering the limitation of compression ratio, the thickest continuous casting slab of 300mm can only produce 100mm thick extra-thick steel plate, and even the thickest continuous casting slab of 400mm can only produce 135mm thick extra-thick steel plate, which is difficult Meet the needs of extra-thick steel plates over 150mm

[0007] ②As the thickness of the slab increases, the internal quality of the slab tends to deteriorate, especially the central segregation is difficult to eliminate

[0008] The second is the traditional mold casting process

[0009] ① Die casting must cut the head and tail, and the yield is low

At the same time, due to head and tail cutting and low yield, the largest single weight of finished steel plates produced by die-casting steel ingots in China is actually less than 26 tons, which still cannot meet the production requirements of some steel plates with larger single weights.

[0011] ③The internal solidification structure of traditional die-casting steel ingots is complex, and the solidification structure changes greatly in the casting direction. There is a section of internal quality in the middle that is relatively ideal, and the areas near the head and bottom are prone to shrinkage cavities, porosity, and large macro-segregation, which affect Properties and internal quality of finished steel plates

However, the electroslag remelting steel ingot is used as a blank, and there are also the following problems: ①. The production cost is relatively high, and the cost per ton of electroslag remelting steel ingot is much higher than that of continuous casting steel ingot and die casting steel ingot

②. Low production efficiency, which is not good for environmental protection

③. The surface quality is also inferior to that of continuous cast steel ingots

[0016] ①The continuous steel casting process is mature and economical, but the maximum thickness specification is only 600mm at present, and as the thickness increases, the internal quality has an unfavorable trend

[0017] ② Die casting technology is mature and relatively economical, but the finished product rate is low, and the maximum unit weight and the internal and external quality of steel ingots still cannot meet the market requirements

[0018] ③ Electroslag remelting can produce steel ingots required for extra-thick and extra-large single-weight steel plates, but the production cost is high and the production efficiency is low

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