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Die casting method for casting 80 t-grade large forged ingots through bottom casting method

A die-casting, large-scale technology, applied in the field of metallurgy, can solve the problems of difficult control of injection speed, easy cracks, poor surface quality, etc., and achieve the effects of easy operation, surface crack prevention, and good surface quality

Inactive Publication Date: 2019-11-26
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The upper injection method is easy to cause defects such as surface scars and subcutaneous air bubbles, and the surface quality is poor.
In the casting method, since a single plate can only cast a large forging ingot of 80t level, the injection speed is not easy to control, and at the same time, due to the huge volume, crack defects are easy to occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, the 80t-grade 42CrMo steel ingot is mold-cast, and the pouring method is used, including the superheat of molten steel pouring, the pouring time of the steel ingot body, the pouring time of the cap mouth of the steel ingot, the demoulding after pouring, and the slow cooling control of the stacked red ladle. The process steps are as follows:

[0018] During the mold casting process, the pouring superheat of molten steel is 36°C, the pouring time for the ingot body is 20 minutes, the pouring time for the cap mouth of the ingot is 8 minutes, and the pouring nozzle aperture is 45mm;

[0019] After 24 hours of pouring, the surface temperature of the steel ingot dropped to 550°C and the demoulding took place. After the demoulding, the steel ladles were stacked and cooled slowly for 6 days until the surface temperature dropped to 170°C. 99.15%, no cracks on the surface, good surface quality.

Embodiment 2

[0021] In this embodiment, the 80t-grade Q235D steel ingot is die-cast, and poured by the down-casting method, including the superheat of molten steel pouring, the pouring time of the steel ingot body, the pouring time of the cap mouth of the steel ingot, the demoulding after pouring, and the slow cooling control of the stacked red ladle. The process steps are as follows:

[0022] During the mold casting process, the pouring superheat of molten steel is 34°C, the pouring time for the ingot body is 22 minutes, the pouring time for the cap mouth of the ingot is 9 minutes, and the pouring nozzle aperture is 45mm;

[0023] After 27 hours of pouring, the surface temperature of the steel ingot dropped to 600°C and the demoulding took place. After the demoulding, the buckle red steel ladles were stacked and cooled slowly for 6 days until the surface temperature dropped to 190°C. 99.35%, no cracks on the surface, good surface quality.

Embodiment 3

[0025] In this embodiment, the 35# steel ingot of 80t level is mold-cast, which is poured by the pouring method, including the superheat of molten steel pouring, the pouring time of the ingot body, the pouring time of the cap mouth of the steel ingot, the demoulding after pouring, and the slow cooling control of the red ladle stacking. Concrete process steps are as follows:

[0026] During the mold casting process, the pouring superheat of molten steel is 32°C, the pouring time for the ingot body is 24 minutes, the pouring time for the cap mouth of the ingot is 8 minutes, and the pouring nozzle aperture is 45mm;

[0027] After 26 hours of pouring, the surface temperature of the steel ingot dropped to 580°C and the mold was removed. After the demoulding, the buckle red steel ladle was stacked and cooled slowly for 7 days until the surface temperature dropped to 160°C. 99.42%, no cracks on the surface, good surface quality.

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Abstract

The invention discloses a die casting method for casting 80 t-grade large forged ingots through a bottom casting method. The die casting method adopts the bottom casting method to cast; and key control parameters comprise molten steel casting superheat degree, steel ingot body casting time, steel ingot cap port casting time, demolding after casting and buckle red ladle stacking slow cooling control. The method is convenient and feasible in operation, can improve the steel ingot internal quality, reduces such defects as steel ingot head looseness and shrinkage, can prevent steel ingot surface cracks, and reduces wastes caused by crack defects in die casting of the 80 t-grade large forged ingots. The method adopts lower superheat degree and longer casting time; after steel ingots are cast bynot lower than 24 h, buckle red ladles are stacked and slowly cooled by 5-7 days; after longer demolding time and stacking and slow cooling time, the after-forging flaw detection GB / T6402-2008 three-level pass percent is not lower than 99.05%; no surface crack defect is generated; and excellent internal quality and surface effect are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a die casting method for pouring 80t-level large forged ingots by pouring. Background technique [0002] As an important part of large pressure vessel equipment, large forged ingots have high requirements for their internal quality and surface quality due to their harsh working environment. At present, most manufacturers in China use the down-casting method to pour forged ingots below 60t, while the up-casting method is used for steel ingots above 60t. The upper injection method is easy to cause defects such as surface scarring and subcutaneous air bubbles, and the surface quality is poor. In the pouring method, since a single plate can only cast a large forging ingot of 80t level, the injection speed is not easy to control, and at the same time, due to the huge volume, crack defects are prone to occur. In order to reduce the unplanned waste caused by surface cra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/00
CPCB22D7/00
Inventor 甄光楠何德志
Owner WUYANG IRON & STEEL
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