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A water-cooled crystallization process for steel ingots with risers

A steel ingot, water cooling technology, applied in the steel ingot water cooling crystallization process and its special water cooling mold. It can solve the problems of water-cooled mold deformation, low service life, and accumulation of impurities, and achieve the effects of reducing the degree of central segregation, compact internal structure, and uniform cooling speed

Active Publication Date: 2017-01-04
SHANDONG BAODING HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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 embedded with a heat preservation cap. The inner wall of the phantom body is a cylindrical structure with a top diameter slightly smaller than that of the bottom part, and a cooling water jacket is provided around the phantom body. The gap between the walls of the jacket gradually increases from bottom to top, and the two ends of the cooling water jacket are equipped with cooling water inlets and outlets
[0003] When the water-cooled casting mold is in use, it is easy to form a "dead water zone" at the inlet and outlet of the water, resulting in uneven cooling speed of the steel ingot, and the steel ingot is prone to cracks, so it is not conducive to the production of large-tonnage steel ingots during the production process. , the way of water intake is easy to cause deformation of the water-cooled mold, and its service life is low

Method used

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  • A water-cooled crystallization process for steel ingots with risers
  • A water-cooled crystallization process for steel ingots with risers
  • A water-cooled crystallization process for steel ingots with risers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Type: high-quality carbon steel, steel type: 20, carbon content: 0.17-0.23%; tonnage: 8 tons;

[0028] 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;

[0029] 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;

[0030] The pouring speed of the riser is lower than the pouring speed of the ingot body, and the pouring time of the riser is 6-8min;

[0031] Continuously feed condensed water, keep warm for 30 minutes, and release the steel ingot from the mold after condensation;

[0032] The steel ingot after demoulding is put into the insulation cover without the i...

Embodiment 2

[0035] Type: high-quality carbon steel, steel type: 65Mn, carbon content: 0.62-0.70%, tonnage: 11 tons;

[0036] 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;

[0037] 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;

[0038] The pouring speed of the riser is lower than the pouring speed of the ingot body, and the pouring time of the riser is 10 minutes;

[0039] Continuously feed condensed water, keep warm for 70 minutes, and release the steel ingot from the mold after condensation;

[0040] The steel ingot after demoulding is put into the insulation cover w...

Embodiment 3

[0043] Type: alloy steel, steel type: 5CrMnMo, carbon content: 0.50-0.60%, tonnage 18 tons;

[0044] 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;

[0045] 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;

[0046] The pouring speed of the riser is lower than the pouring speed of the ingot body, and the pouring time of the riser is 10 minutes;

[0047] Continue to feed condensed water, keep warm for 90 minutes, and release the steel ingot from the mold after condensation;

[0048] The steel ingot after demoulding is put into the heat preservation cover without h...

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Abstract

The invention relates to a steel ingot water-cooling crystallization process. The process comprises the following steps that condensate water is poured into a cooling water cavity in advance; liquid steel is poured into a mould body of a water-cooling mould after temperature is controlled, the pouring speed of a riser is lower than that of a steel ingot, the condensate water is poured continuously with the temperature maintained for 30 min-160 min, and the steel ingot is released after being condensed; then, a thermal insulation sleeve without a thermal insulation cover is covered, ventilation is performed for 3 h-15 h, and the thermal insulation sleeve is covered with the thermal insulation cover with the temperature maintained for 15 h-40 h; the steel ingot is transferred into a pit with the temperature maintained for 10 h-40 h after all the steel ingots are condensed. The process has the advantages that the thermal insulation sleeve is adopted, the large steel ingot free of pores, dense in internal tissue structure and good in quality is obtained after pouring by controlling the use mode of the thermal insulation sleeve; cooling water can only gradually rise from the lower portion of a mould cavity by means of a cooling water path formed by the cavity wall in a partitioned mode, so that it is guaranteed that the cooling mode is achieved, no dead water zones exist in a cooling process of the steel ingot by means of the cooling water circulation mode, cooling speed is even, the water-cooling mould will not deform, service life is long, and each steel ingot mould is used about 500 times.

Description

technical field [0001] The invention relates to a steel ingot crystallization process, more specifically a steel ingot water-cooled crystallization process and a special water-cooled mold. 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 bod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D7/06B22D30/00
Inventor 王传宝
Owner SHANDONG BAODING HEAVY IND
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