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Method for manufacturing low-segregation large-sized steel ingot by quickening cooling of bottom and lateral wall

A manufacturing method and technology for steel ingots are applied in the field of manufacturing large-scale steel ingots with low segregation by accelerating bottom and side wall cooling, which can solve the problems of serious segregation and low production efficiency of large-scale steel ingots, and achieve the advantages of inhibiting steel ingot segregation, low cost, and shortening stripping. The effect of mold time

Active Publication Date: 2008-10-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a manufacturing method for obtaining large steel ingots with low segregation by accelerating the cooling of the bottom and side walls, so as to solve the current problems of serious segregation and low production efficiency of large steel ingots; The time and flow rate of wall ventilation ensure that the segregation of large steel ingots is suppressed and no other defects occur

Method used

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  • Method for manufacturing low-segregation large-sized steel ingot by quickening cooling of bottom and lateral wall
  • Method for manufacturing low-segregation large-sized steel ingot by quickening cooling of bottom and lateral wall
  • Method for manufacturing low-segregation large-sized steel ingot by quickening cooling of bottom and lateral wall

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Embodiment 1

[0049] Such as figure 1 As shown, the material of the steel ingot mold is gray cast iron HT150, the preheating temperature of the steel ingot mold is 100°C, the riser adopts thermal insulation riser, the taper of the riser is 15.6%, the ratio of height to diameter of the steel ingot is 1:1; the weight of poured metal liquid is 130 tons , pouring time 25min, vacuum pouring, pouring temperature is 1580 ℃, the steel grade adopted in the present invention is H13, by weight percentage, its chemical composition C: 0.32~0.45%, Si: 0.80~1.20%, Mn: 0.20~ 0.50%, Cr: 4.75-5.50%, Mo: 1.10-1.75%, V: 0.80-1.20%, S, P: <0.030%, Fe balance. After pouring, fill the top of the riser with heating agent and thermal insulation covering agent; after the ingot pouring, the chassis can start to pass compressed air, and after 2 to 3 hours, the side wall of the ingot mold can start to pass compressed air.

[0050] In this embodiment, the air volume of compressed air should be small at the beginning, a...

Embodiment 2

[0055] The difference from Example 1 is:

[0056] The material of the steel ingot mold is gray cast iron HT250, the preheating temperature of the steel ingot mold is 150°C, the riser adopts thermal insulation riser, the taper of the riser is 13.2%, the ratio of height to diameter of the steel ingot is 1.4:1; the weight of pouring molten metal is 380 tons, and the pouring time 60 minutes; After the ingot pouring, the chassis can start to pass the compressed air, and after 4 to 5 hours, the side wall of the steel ingot mold can start to pass the compressed air.

[0057] In this embodiment, the air volume of compressed air should be small at the beginning, and then gradually increase the flow rate, the flow rate of the compressed air changes in the range of 5-9 kg / s, and the pressure of the compressed air is 8 atmospheres.

[0058] The present invention uses computer simulation software to simulate the temperature field and casting defects, such as Figure 10 The simulation resu...

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Abstract

The invention discloses a manufacturing method of low-segregation large-scale steel ingots obtained by accelerating the cooling of the bottom part and the side wall and relates to the manufacturing process of various levels of large-scale steel ingots, which is applicable to the control of the segregation of various components of carbon steel and alloy steel ingots and can be used for the casting process of vacuum pouring and non-vacuum pouring steel ingots, the control of the macro-segregation and the alleviation of the micro-segregation. The specific steps of the invention are that: 1) steel ingot mold material is a gray cast iron; 2) a riser adopts an insulated riser, the taper thereof is 8 to 16 percent; 3) the height-to-diameter ratio of the steel ingot is 1: 1 to 3: 1; 4) the steel ingot material is the carbon steel or the alloy steel; 5) an aeration conduit is pre-casted in the middle and lower part of the steel ingot mold and a chassis of the steel ingot mold; 6) the chassis starts the aeration of compressed air after the steel ingot pouring is finished, and the aeration of the compressed air on the side wall of the steel ingot mold can be carried out after 1 to 6 hours. A cooling system with the aeration of the compressed air at the chassis of the large-scale steel ingot and the side wall of the ingot mold designed by the invention can greatly improve the cooling speed of the large-scale steel ingot and effectively inhibit various segregations of the large-scale steel ingot.

Description

technical field [0001] The invention is a manufacturing method for obtaining low-segregation large-scale steel ingots by accelerating the cooling of the bottom and side walls, which involves the manufacturing process of various grades of large-scale steel ingots, is suitable for the segregation control of various components of carbon steel and alloy steel ingots, and can be used for vacuum pouring And the casting process of non-vacuum pouring steel ingot, control macro segregation and reduce micro segregation. Background technique [0002] In recent years, as electric power, metallurgy, petrochemical, aerospace, shipbuilding and other industrial equipment continue to develop towards integration and large-scale, the demand for large forgings is increasing, so the grade requirements for large steel ingots are also getting higher and higher. The solidification process of large steel ingots is very long, ranging from tens of hours to hundreds of hours. The solute redistribution ...

Claims

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Application Information

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IPC IPC(8): B22D27/04
Inventor 桑宝光李殿中夏立军康秀红陈露贵傅排先李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI