A method for preparing ingots by layer-by-layer pouring based on slag protection

An ingot and slag technology, applied in the fields of metallurgy and foundry, can solve the problems of difficult one-hundred-ton steel ingots and high production costs, and achieve the effects of realizing metallurgical bonding, solving interface oxidation, and avoiding oxidation of molten steel surface.

Active Publication Date: 2020-08-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology is difficult to use to produce large ingots of hundreds of tons, and the production cost is high

Method used

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  • A method for preparing ingots by layer-by-layer pouring based on slag protection

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, a 1 ton low-alloy steel ingot is prepared, and its casting method includes the following steps:

[0020] (1) Determine the required amount of molten steel according to the specifications of the cast large ingot, and divide the amount of molten steel into 4 parts, each 0.25 tons, and melt the molten steel one by one according to the casting sequence and time;

[0021] (2) The 0.25 tons of molten steel in the tundish 4 is poured into the steel ingot mold 1 through the stopper 5 along the nozzle 2. The superheating temperature of the molten steel during pouring is 50 ℃, and the pouring speed is 0.1 ton / min; The slag feeder 3 adds 2Kg (volume ratio with molten steel about 0.016:1) of TLC-32 domestic glass mold flux slag to the steel ingot mold 1, so that the slag evenly covers the entire surface of the molten steel;

[0022] (3) When the remaining volume fraction of molten steel in the ingot mold 1 is 5%, that is, the molten steel has solidified 95%, move anoth...

Embodiment 2

[0025] In this embodiment, 18 tons of low alloy steel ingots are prepared, and the pouring method includes the following steps:

[0026] (1) Determine the required amount of molten steel according to the specifications of the large cast ingots, and divide the amount of molten steel into 9 parts, 2 tons each, and melt the molten steel one by one according to the casting sequence and time;

[0027] (2) The 2 tons of molten steel in the tundish 4 are poured into the steel ingot mold 1 along the nozzle 2 through the stopper 5, where the molten steel overheating temperature is 35°C during pouring, and the pouring speed is 3 tons / min; The slag feeder 3 adds 15Kg (volume ratio with molten steel about 0.015:1) TLC-32 domestic glass mold flux slag to the steel ingot mold 1, so that the slag evenly covers the entire surface of the molten steel;

[0028] (3) When the remaining volume fraction of molten steel in the ingot mold 1 is 15%, that is, the molten steel has solidified 85%, move another ...

Embodiment 3

[0031] In this embodiment, 50 tons of low-alloy steel ingots are prepared, and the casting method includes the following steps:

[0032] (1) Determine the required amount of molten steel according to the specifications of the cast large ingot, and divide the amount of molten steel into 25 parts, 2 tons each, and melt the molten steel one by one according to the casting sequence and time;

[0033] (2) The 2 tons of molten steel in the tundish 4 are poured into the steel ingot mold 1 through the stopper 5 along the nozzle 2. The superheating temperature of the molten steel during pouring is 70 ℃, and the pouring speed is 4 tons / min; The slag feeder 3 adds 15Kg (volume ratio with molten steel about 0.015:1) TLC-32 domestic glass mold flux slag to the steel ingot mold 1, so that the slag evenly covers the entire surface of the molten steel;

[0034] (3) When the remaining volume fraction of molten steel in the ingot mold 1 is 0%, that is, the molten steel is completely solidified, move a...

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Abstract

The invention discloses a layer-by-layer pouring method for preparing ingots based on slag protection, according to the specifications of the poured large ingots, Determine the amount of steel required, and dividing the steel amount into several parts, melting molten steel one by one, After the first molten steel is poured, A mould powder is adde to completely cover that surface of the molten steel, After the molten steel approaches complete solidification, a second part of molten steel is poured into the ingot mold, and a proper amount of protective powder is added; after the molten steel approaches complete solidification, a third part of molten steel is poured into the ingot mold, and a proper amount of protective powder is added, and the operation is repeated until all the molten steelis poured, and finally, the molten steel in the ingot mold is completely solidified and cooled. At each cas, that molten steel can be guaranteed to completely melt and float the protective slag in the ingot mould to the surface of the molten steel, The surface of molten steel is always completely covered by mold powder, which effectively solves the macrosegregation of large-scale ingot. The addedmold powder can not only absorb the inclusion in molten steel, but also clean the molten steel and avoid the oxidation and heat preservation on the surface of molten steel.

Description

Technical field [0001] The invention belongs to the field of metallurgy and casting, and in particular relates to a method for preparing ingots by layer-by-layer casting based on slag protection. Background technique [0002] The preparation of large metal ingots has always been the focus of attention in the field of metal materials, especially the preparation of large steel ingots of 100 tons. This is because the large-scale key components necessary for the construction of hydropower, thermal power, nuclear power plants and other national heavy equipment first need to be cast into hundreds of tons of large steel ingots, and then forging and heat treatment to obtain the required shape and performance, and the preparation of large steel ingots is the first step The quality of the process and its quality almost determine whether the final product is qualified. Therefore, the preparation of high-quality 100-ton large steel ingots is the manufacturing basis for the entire large-scal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D7/00
CPCB22D7/00
Inventor 翟启杰宋长江张云虎陈湘茹徐智帅李仁兴
Owner SHANGHAI UNIV
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