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Steel ingot water-cooling crystallization process without feed head

A water-cooling and steel ingot technology is applied in the field of water-cooling crystallization process of steel ingots without risers, which can solve the problems of low yield of steel, unreachable ingots, risers of steel ingots, etc. Effect

Active Publication Date: 2014-08-27
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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  • Steel ingot water-cooling crystallization process without feed head
  • Steel ingot water-cooling crystallization process without feed head
  • Steel ingot water-cooling crystallization process without feed head

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 insulat...

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Abstract

The invention relates to a steel ingot water-cooling crystallization process without a feed head. The steel ingot water-cooling crystallization process comprises the following steps of guiding condensate water into a cooling water cavity through a water inlet pipe in advance after half casting molds of a water-cooling mold are fixed through bolts; pouring molten steel into the casting molds of the water-cooling mold; carrying out mold stripping after 10-40 minutes of heat preservation; covering a steel ingot with a heat preservation cover after mold stripping, removing the heat preservation cover after 13-20 hours of heat preservation, placing the steel ingot into a heat preservation sleeve which is not covered with a heat preservation cover for 3-15 hours of ventilation, and then covering the steel ingot with the heat preservation cover for 15-40 hours of heat preservation; after condensation of all the steel ingots is completed, transferring the steel ingots into a pit for 10-40 hours of heat preservation. The steel ingot water-cooling crystallization process has the advantages that by adopting a cooling water circulation mode, dead water zones do not exist when the steel ingots are cooled, the cooling speed is uniform, the water-cooling mold does not deform, the service life is long, each ingot mold can be used about 500 times, the contraction effect of the upper portion is good, the cast steel ingot is compact in structure, free of air holes and the like, and the yield of steel is high. According to the scheme, the cooling speed is uniform, a chilled layer is thick after the steel ingot is cast, the cooling speed of the steel ingot is high, and the compactness of the steel ingot is good.

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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IPC IPC(8): B22D7/06B22D7/10
Inventor 王传宝
Owner SHANDONG BAODING HEAVY IND
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