Method for preventing heavy steel ingot from liquating by different pouring ladles

A steel ingot and segregation technology, which is applied in the field of suppressing segregation of large steel ingots through multi-clad casting, can solve problems such as segregation of large steel ingots, achieve the effects of reducing negative segregation at the bottom, improving the quality of steel ingots, and increasing the time interval

Inactive Publication Date: 2009-08-19
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

[0004] The purpose of the present invention is to provide a multi-ladle pouring method that suppresses the se

Method used

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  • Method for preventing heavy steel ingot from liquating by different pouring ladles
  • Method for preventing heavy steel ingot from liquating by different pouring ladles
  • Method for preventing heavy steel ingot from liquating by different pouring ladles

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0055] Example 1

[0056] like figure 1 As shown, the material of the ingot mold is gray cast iron HT150, the preheating temperature of the ingot mold is 50℃, the riser adopts thermal insulation riser, the taper of the riser is 11.5%, and the height-diameter ratio of the ingot is 1.15:1; the weight of the molten metal poured is 500 tons , the superheating temperature is 20 ℃, by weight percentage, chemical composition of 508-3 low alloy steel: C: 0.18%, Si: 0.20%, Mn: 1.45%, Mo: 0.5%, Ni: 0.75%, Cr: 0.15% , P≤0.005%, S≤0.002%, Fe balance. Fill the top of the riser with exothermic agent and thermal insulation covering agent.

[0057] The first process is adopted: (1) Top casting is used, and vacuum is applied before casting to reduce secondary oxidation. (2) At the same time, use thermal insulation riser, exothermic agent and thermal insulation covering agent to minimize shrinkage and porosity defects of steel ingots. (3) The first bag is poured with molten steel with a C c...

Example Embodiment

[0062] Example 2

[0063] The difference from Example 1 is that the ingot mold material is gray cast iron HT250, the ingot mold preheating temperature is 150°C, the riser adopts a thermal insulation riser, and the riser taper is 10%; the molten metal weight is 600 tons.

[0064] The present invention adopts computer simulation software to carry out the simulation of macrosegregation, Figure 9 Corresponding process one, Figure 10 Corresponding to the second process, Figure 11 Corresponding to process three, Figure 12 Corresponding to process four, Figure 13 Corresponding to process five, Figure 14 Corresponding to process six, Figure 15 Corresponding to process seven.

[0065] Process 4: (1) Top-casting is used, and vacuum is applied before casting to reduce secondary oxidation. (2) At the same time, use thermal insulation riser, exothermic agent and thermal insulation covering agent to minimize shrinkage and porosity defects of steel ingots. (3) The first bag is...

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Abstract

The invention discloses a method for restraining the liquation of a large-sized steel ingot through multi-ladle composite casting, relates to a casting process for large-sized steel ingots of metal molds of all grades below 600t, is applied to a casting process for carbon steel and alloy steel ingots under vacuum and non-vacuum conditions, and has restraint function on the liquation of all components of steel ingots made of various metal materials. The method comprises that: 1) a steel ingot mold is made of grey cast iron; 2) a riser head adopts a heat insulating riser head, and the taper thereof is between 8 and 16 percent; 3) the ratio of the height to the diameter of the steel ingot is 1:1-3:1; 4) the steel ingot is made of carbon steel or alloy steel; 5) different pouring ladles adopt different component ratios; and 6) the pouring process of different pouring ladles adopt different time intervals. The method designs the multi-ladle pouring technical proposal of the large-sized steel ingot, has good restraint function on the liquation of the large-sized steel ingots, and solves the prior problem of the liquation of the large-sized steel ingots in factories.

Description

technical field [0001] The invention is a method for suppressing the segregation of large steel ingots through multi-cladding casting, which involves the casting process of large steel ingots of all levels of metal molds below 600t, and is applied to the casting process of carbon steel and alloy steel ingots under vacuum and non-vacuum conditions. The segregation of various components of metal ingots can be inhibited. Background technique [0002] As a relatively clean, safe and cheap energy source, nuclear power has been developed and utilized by countries all over the world. In recent years, the development of my country's national economy has increased the demand for energy. In order to solve the sharp contradiction between energy supply and energy demand, the country has placed nuclear energy in a prominent position in the energy development strategy. Therefore, a domestic nuclear power equipment market with great potential has been formed. Large forgings required for ...

Claims

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Application Information

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IPC IPC(8): B22D37/00
Inventor 李殿中康秀红刘东戎桑宝光夏立军
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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