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Preparation method and mold for microdefect high-utilization rate high-quality static ingot

A utilization rate and micro-defect technology, which is applied in the field of preparation of high-quality mold-cast steel ingots with high utilization rate of micro-defects, can solve the problems of wasting energy, material, manpower and material resources, restricting the development of high-quality forgings, and low utilization rate of steel ingots. Steel ingot utilization rate, reduction and shrinkage porosity and segregation problems, and the effect of improving internal quality

Active Publication Date: 2013-04-03
中科西王特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the steel ingots commonly used in the industry are generally designed with a small height-to-diameter ratio or a large steel ingot riser design, and even the riser end and tail cone end of the steel ingot are cut off by 100-300mm, resulting in low utilization of the steel ingot
A lot of energy, materials, manpower and material resources are wasted. Even so, the pass rate of forgings is relatively low, which restricts the development of high-quality forgings

Method used

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  • Preparation method and mold for microdefect high-utilization rate high-quality static ingot
  • Preparation method and mold for microdefect high-utilization rate high-quality static ingot
  • Preparation method and mold for microdefect high-utilization rate high-quality static ingot

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] As shown in Figure 1(b), the cross-section of the trial-produced 2.5-ton ingot is a round steel ingot with a height-to-diameter ratio of 2.5. The pouring molten steel material is 42CrMo and the pouring temperature is 1540°C. After pouring, the nucleation operation is triggered by vibrating micro-zones on the riser. The vibration time is 8 minutes. After the riser vibrates, the plasma submerged arc heating gun is invaded into the molten metal to heat the ingot riser. The temperature of molten steel on the surface of the riser is 10-20°C higher than the liquidus line of this steel type. When the temperature of the steel ingot shell drops to 900°C, the mold will be demoulded. figure 2 As shown, the test results show that the core of the steel ingot is dense, and no shrinkage cavity porosity visible to the naked eye is found, and there is no type A segregation. In addition, no large inclusions were found in the negative segregation area at the tail of the ingot. Therefore,...

Embodiment 2

[0059] As shown in Figure 1(b), the cross-section of the trial-produced 5.5-ton ingot is a round steel ingot with a height-to-diameter ratio of 3. The pouring molten steel material is 42CrMo and the pouring temperature is 1540°C. After pouring, the nucleation operation is triggered by vibrating micro-zones on the riser. The vibration time is 10 minutes. The temperature of molten steel on the surface of the riser is 10-20°C higher than the liquidus line of this steel type. When the temperature of the steel ingot shell drops to 1000°C, the mold is demoulded. image 3As shown, the test results show that the core of the steel ingot is dense, no shrinkage cavity and loose defects visible to the naked eye are found, and there is a lighter type A segregation. In addition, no large inclusions were found in the negative segregation area at the tail of the ingot. Therefore, by using the vibration device in the riser of the steel ingot to perform micro-area triggered nucleation operatio...

Embodiment 3

[0061] As shown in Figure 1(a), a 50-ton die-cast billet (square steel ingot) with a small top and a large bottom is developed, with a height-to-diameter ratio of about 4. The molten steel material is selected as Q345, and the pouring temperature is 1540°C. Using computer simulation technology to simulate the solidification process of steel ingots, such as Figure 4 As shown, for the common preparation process, the thermal junction area of ​​the steel ingot is in the middle and lower part of the steel ingot, which is easy to cause serious shrinkage and porosity problems. Such serious shrinkage and porosity defects may make the forged product scrapped. In order to eliminate such defects, the steel ingot was demolded at a high temperature after solidification for 1 hour, followed by heat preservation treatment, and heat treatment on the riser. In order to prevent the riser from running out of steel, the riser was heated by a low-power submerged arc , and the heating area is mai...

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Abstract

The invention relates to the field of static ingot preparation, in particular to a preparation method and a mold for a microdefect high-utilization rate high-quality static ingot. The invention is applied to preparing carbon steel, alloy steel and nonferrous metals under vacuum and non-vacuum conditions and has an effect of inhibiting defects, such as shrinkage cavity and porosity, segregation and deposit cone in ingots of various materials. Through adopting a big end down mold design, microzone triggered nucleation is performed by adopting a vibration device to refine grains; a dead head is heated by adopting plasma submerged arc heating; the ingot is demolded by adopting the high-temperature demolding process; thermal insulation is performed on a demolded ingot by adopting a thermal insulation material, and therefore, the thermal stress of the center of the ingot is reduced, and the shrinkage cavity and porosity defect in the ingot is eliminated by adopting an ingot self-feeding mechanism. According to the preparation method and the mold for the microdefect high-utilization rate high-quality static ingot, the problem of the shrinkage cavity and porosity defect in the ingot is effectively solved, the dimension of the dead head is reduced, and the utilization rate and the production efficiency of the ingot are greatly improved.

Description

technical field [0001] The invention relates to the field of preparation of die-casting steel ingots, in particular to a preparation method and mold for high-quality die-casting steel ingots with micro-defects and high utilization rates, which are applied to the preparation of carbon steel, alloy steel and non-ferrous metals under vacuum and non-vacuum conditions. It can inhibit defects such as shrinkage porosity, segregation, and deposition cones inside steel ingots of various materials. Background technique [0002] In recent years, with the rapid development of my country's electric power industry, nuclear industry and petrochemical industry, the demand for large forgings is increasing, and the quality requirements for large forgings are also getting higher and higher. Large-scale forgings are the basis for supporting equipment in important fields such as energy and electricity, transportation and metallurgical machinery, and are an important symbol to measure the nationa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/06B22D7/00
Inventor 刘宏伟傅排先栾义坤康秀红夏立军李殿中李依依
Owner 中科西王特钢有限公司
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