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Pressure casting method for purifying, homogenizing, densifying, fine-grained and fine-grained iron and steel slabs

A homogenization and densification technology, applied in the field of die casting, can solve problems such as difficult control of central loose defects, weakened feeding effect, and increased cross-sectional size, so as to promote solidification nucleation, eliminate shrinkage cavity porosity, and reduce Effect of Riser Ratio

Active Publication Date: 2016-06-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main problems in the current bloom are: due to the weakening of the gravity feeding effect of the riser, it is difficult to control the loose defects in the center; due to the increase of the cross-section size, the grain growth leads to the coarse grain problem; the pouring instability often causes the inclusion problem ; Macro-segregation defects are serious after the section size increases
Under the current gravity pouring conditions, the above problems are difficult to fundamentally solve

Method used

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  • Pressure casting method for purifying, homogenizing, densifying, fine-grained and fine-grained iron and steel slabs
  • Pressure casting method for purifying, homogenizing, densifying, fine-grained and fine-grained iron and steel slabs
  • Pressure casting method for purifying, homogenizing, densifying, fine-grained and fine-grained iron and steel slabs

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Embodiment

[0056] In this embodiment, the method involved in the present invention is used to prepare a φ800mm×3000mm, 10-ton steel billet, and the material of the molten steel is 45Cr.

[0057] First, electric arc furnace-LF refining and vacuum degassing are used for molten steel treatment, and the weight content of gas and impurity elements is detected before pouring: T.O=15×10 -6 , [S]=40×10 -6 , [P]=80×10 -6 , [H]=1.5×10 -6 , in line with the purity requirements of molten metal.

[0058] Using the pressure casting method of steel slabs, place the molten metal (initial temperature 1550°C, superheat 50°C) into a 15-ton ladle, hoist the ladle into the pressurized tank with tools such as a crane, and then close the pressurized tank top cover. Put the assembled ingot mold cavity and liquid riser into the pressurized casting device, start the pressure controller, and pour the steel billet. By controlling the pressurization method and pressurization speed, the air pressure in the pressu...

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Abstract

The invention relates to the field of manufacturing of large-section thick large blanks, in particular to a pressure casting method of a purified homogenized compacted fine-grained large steel blank. According to the method for improving quality of a large steel blank by pressure effect, the problems that the existing large-section blank experiences gross segregation, shrinkage cavity and porosity, inclusion and grain coarseness can be solved; the large steel blank can be purified, homogenized, compacted and fine grained during manufacturing; yield of the blank is significantly improved; on such basis, gravity riser feeding is replaced with pressure feeding to allow non-riser casting, and yield of the blank can be significantly increased. The pressure casting method is applicable to manufacturing of large-section steel blanks, including round billets, square billets and flat billets, is applicable to manufacturing of large blanks of aluminum alloy, magnesium alloy and high-temperature alloy and is also applicable to manufacturing of complex castings of ferrous metals and nonferrous metals.

Description

technical field [0001] The invention relates to the field of manufacturing thick and large cross-section metal billets, including the casting of ferrous and nonferrous metal round billets, slabs and square billets, specifically a purification, homogenization, densification and fine-graining The pressure casting method of steel billets (thickness greater than 350 mm or weight more than 2 tons), through the back pressure and the purification control of molten metal, the homogenization, densification and fine graining of the billet are realized. Background technique [0002] Iron and steel blooms are the basic base material of the equipment manufacturing industry, and are widely used in national economy and national defense construction. In energy and power, metallurgical equipment, large ships, and tool and die steels, large-scale rolled / forged products are widely used, such as: nuclear power pressure vessels, large marine crankshafts for ships, hydrogenation reactor container...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/00
Inventor 李殿中王雪东栾义坤刘宏伟傅排先康秀红夏立军李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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