A water-cooled crystallization process for steel ingot without riser

A steel ingot and water-cooling technology, which is applied in the field of water-cooled crystallization technology for steel ingots without risers, can solve the problems of low yield of steel products, inability to reach steel ingots, and generation of scrap steel, etc., and achieve high yield, good compactness of steel ingots, and long service life.

Active Publication Date: 2016-11-30
SHANDONG BAODING HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this steel ingot mold, through the setting of the partition, the walking route of the cooling water cooling mold can be controlled. When the water inlet is located at the lower end of the mold and the water outlet is located at the upper end of the mold, the cooling water must first cool the lower part of the mold, but this method The processed steel ingot has a riser, which must be cut off when used, resulting in a certain waste
[0005] The steel ingot used in the steel ingot crystallization process of the above technology adopts a riser crystallization process. Generally, the weight of the riser accounts for 14%-20% of the weight of the steel ingot. The shrinkage cavity of the steel ingot produced is too deep during the crystallization process, so that the steel ingot cannot meet the original requirements, and even scrap steel is produced, so the yield of steel is lower

Method used

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  • A water-cooled crystallization process for steel ingot without riser
  • A water-cooled crystallization process for steel ingot without riser
  • A water-cooled crystallization process for steel ingot without riser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Type: high-quality carbon steel, steel type: 20, carbon content: 0.17-0.23%; tonnage: 8 tons;

[0034] After the front and rear parts of the water-cooled mold are fixed by bolts, the condensed water is fed into the water-cooled mold in advance, the temperature of the incoming water is less than 36°C, and the pressure of the incoming water is 0.5 MPa;

[0035] After the VD furnace is released, the temperature of the molten steel is 1585±5°C. After the temperature is controlled to 1570-1580°C, it is slowly poured into the mold of the water-cooled mold through the sprue, and the pouring time of the ingot body is 24-26min;

[0036] Continue to feed condensed water, keep warm for 10 minutes, and demould the steel ingot after condensation;

[0037] Put the heat preservation cover on the steel ingot after demoulding, and keep it warm for 4 hours (to ensure that the steel ingot is basically crystallized), and then remove the heat preservation cover.

[0038] Put the steel ingo...

Embodiment 2

[0042] Type: high-quality carbon steel, steel type: 65Mn, carbon content: 0.62-0.70%, tonnage: 11 tons;

[0043] After the front and rear parts of the water-cooled mold are fixed by bolts, the condensed water is fed into the water-cooled mold in advance, the temperature of the incoming water is less than 36°C, and the pressure of the incoming water is 0.5 MPa;

[0044] After the VD furnace is released, the temperature of the molten steel is 1550±5°C. After the temperature is controlled to 1535-1545°C, it is slowly injected into the mold of the water-cooled mold through the runner, and the pouring time of the ingot body is 15 minutes;

[0045] Continuously feed condensed water, keep warm for 12 minutes, and release the steel ingot from the mold after condensation;

[0046] Put the heat preservation cover on the steel ingot after demoulding, and remove the heat preservation cover after 5 hours of heat preservation.

[0047] Put the steel ingot with the insulation cover removed ...

Embodiment 3

[0051] Type: alloy steel, steel type: 5CrMnMo, carbon content: 0.50-0.60%, tonnage 18 tons;

[0052]After the front and rear parts of the water-cooled mold are fixed by bolts, the condensed water is fed into the water-cooled mold in advance, the temperature of the incoming water is less than 36°C, and the pressure of the incoming water is 0.5 MPa;

[0053] After the VD furnace is released, the temperature of the molten steel is 1555±5°C. After the temperature is controlled to 1540-1550°C, it is slowly poured into the mold of the water-cooled mold through the runner, and the pouring time of the ingot body is 18 minutes;

[0054] Continuously feed condensed water, keep warm for 20 minutes, and release the steel ingot from the mold after condensation;

[0055] Put the heat preservation cover on the steel ingot after demoulding, and remove the heat preservation cover after 6 hours of heat preservation.

[0056] Put the steel ingot with the insulation cover removed into the insula...

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PUM

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Abstract

The invention relates to a water-cooled crystallization process for a steel ingot without a riser, which comprises the following steps: after the half-mold of the water-cooled mold casting is fixed by bolts, the condensed water is introduced into the cooling water chamber through the water inlet pipe in advance; pouring into the pouring mold of the water-cooled mold; Demould after 10-40min; put the heat preservation cover on the steel ingot after demoulding, remove the heat preservation cover after 13-20 hours of heat preservation, ventilate the heat preservation cover without heat preservation cover for 3-15h, cover the heat preservation cover, and keep heat for 15-40h ; After all condensation, transfer to the pit to keep warm for 10-40h. The beneficial effect of the present invention is: the cooling water circulation mode of the present invention makes the steel ingot have no dead water area in the cooling process, the cooling speed is uniform, the water-cooled mold does not deform, and the service life is long. Each steel ingot mold can be used about 500 times, and the upper shrinkage effect is good. , and the cast steel ingot has a fine structure and no pores, etc., and the steel yield is high. In this scheme, the cooling rate is uniform.

Description

technical field [0001] The invention relates to a steel ingot crystallization process, more specifically a water-cooled crystallization process for a steel ingot without a riser. Background technique [0002] The crystallization technology of the steel ingot directly affects the final quality of the steel ingot. Due to the water cooling technology, the water cooling mold has a faster cooling speed than air cooling, which improves the quality of the steel ingot. However, the water cooling is from bottom to top. If the cooling speed is too slow, it will cause impurities. Agglomeration makes the central segregation of the steel ingot itself too large, resulting in waste products. For example, the patent application No. 201210180527.8 discloses a new type of steel ingot water-cooled casting mold and method, which is composed of an attached plate, a mold body and a thermal insulation cap. The phantom body is seated on the attached plate, and the wound of the phantom body is embed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D7/06B22D7/10
Inventor 王传宝
Owner SHANDONG BAODING HEAVY IND
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