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Reduction casting compositing method and device for large iron ingots

A composite device and steel ingot technology, which is applied in the reduction casting composite method and device field of large steel ingots, can solve the problems of difficult fixing of rods and cumbersome cloth distribution, and achieve the elimination of heating process, increase of solidification speed, avoidance of secondary oxidation and inhalation effect

Inactive Publication Date: 2015-04-01
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is more cumbersome to fabricate, and the bar is not easy to fix, and the weight ratio of the bar to the ingot needs to be controlled within the range of 0.8% to 3%.

Method used

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  • Reduction casting compositing method and device for large iron ingots

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] like figure 1 As shown, a reduction casting compound method for large steel ingots is adopted, and large steel ingots of 125 to 130 tons are produced in one reduction casting process. The content of the method is as follows:

[0028]Select the steel ingot with the weight of 50 tons to do the core blank 10, the composition of the core blank 10 is 45# steel, the shape of the core blank 10 is a regular octagon, and the cap mouth part is cut off after the core blank 10 is demoulded, and then cooled When the temperature reaches 800° C. to 850° C., high-pressure nitrogen gas is used to blow off the thick primary iron oxide scale on the surface of the core blank 10 . Put the steel ingot mold 8 of 130 tons of large steel ingot into the furnace body 1, place 4 pieces of cylindrical pad iron 9 with a diameter of 60 mm and a height of 100 mm and a composition of 45# steel at the bottom of the steel ingot mold 8, requiring that the surface of the pad iron 9 has no oxidation The ir...

Embodiment 2

[0030] like figure 1 As shown, a large steel ingot reduction casting compound method is adopted, and a large steel ingot of 180 to 190 tons is produced by secondary reduction casting compounding. The content of the method is as follows:

[0031] Select a forged rectangular steel billet with a weight of 40 tons as the core blank 10. The composition of the core blank 10 is 45# steel. First, the core blank 10 is heated to 900 ° C, and the surface of the core blank 10 is blown off by high-pressure nitrogen. primary oxide scale. Put the steel ingot mold 8 of 85 tons of large steel ingot into the furnace body 1, place 4 pieces of cylindrical pad iron 9 with a diameter of 100 mm and a height of 120 mm and a composition of 45# steel at the bottom of the steel ingot mold 8. The surface of the pad iron 9 is required to be free of oxidation The iron sheet is preheated to 150°C, and then the core blank 10 is put into the steel ingot mold 8 by a crane, supported by the pad iron 9, and the...

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Abstract

The invention discloses a reduction casting compositing method and device for large iron ingots. The method includes: selecting a core blank, adjusting the temperature of the core blank, pre-descaling the surface of the core blank, reducing the oxide scale on the surface of the core blank, casting and compositing, cooling the composite ingot, and repeatedly casting and compositing the composite ingot. The device used by the method comprises a furnace, a shell, a thermal insulation layer, an inner shell, an exhaust port, a vacuum air extractor, an inert gas inlet, a steel ingot die, a sizing block, the core blank, an iron cap section, an thermal insulation plate, a sprue brick, a connecting bolt, a sealing rubber ring, a reduction gas inlet, a furnace cover, a casting passage, a valve rod, a valve body, a valve plate, an asbestos gasket, a slide gate nozzle and a steel ladle. By the method and device, large and super-large cast steel ingots which cannot be produced by common casting can be produced. The steel ingots produced by the method and device are low in production cost, low in internal segregation, good in internal quality, high in yield, and the like.

Description

technical field [0001] The invention relates to a production method and a device for an alloy steel ingot, in particular to a reduction casting compound method and a device for a large steel ingot. Background technique [0002] At present, die casting ingots and electroslag remelting ingots are still the main production methods for large ingots, but both of these ingot production methods have some disadvantages. When casting large steel ingots, the solidification speed slows down with the increase of the ingot shape, which brings a series of quality problems, such as various segregation intensification, porosity and shrinkage cavity increase, non-metallic inclusions increase, columnar crystals It is more developed and the equiaxed grains are thicker, which also leads to a significant decline in the yield of steel ingots. In order to improve the internal quality of large steel ingots, people developed the electroslag remelting method in the 1950s. At present, the electroslag...

Claims

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Application Information

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IPC IPC(8): B22D7/02B22D7/06B22D7/12
CPCB22D7/02B22D7/06B22D7/12
Inventor 井玉安张磊许长军张桐晏笑林袁月明
Owner UNIV OF SCI & TECH LIAONING
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