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Casting technique of grain refined solid manganese steel frog of long life

A casting process, high-manganese steel technology, applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve problems such as micro-cracks, shrinkage cavities, coarse grains, etc., to reduce secondary oxidation, improve quality, and suppress The effect of precipitation

Active Publication Date: 2009-07-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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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 long-life, fine-grained high manganese steel whole-cast frog casting casting process, which solves the problems of high manganese steel full-cast frog castings such as coarse grains, shrinkage cavities, and microcracks. The high-manganese steel whole-cast frogs with refined grain, high strength and long service life have been produced; the material properties have been improved by adopting advanced refining technology and alloying technology, and the mechanical properties of railway high-manganese steel whole-cast frogs have been greatly improved. Great improvement, σb≥910MPa, ak≥190J / cm 2 , δ≥46%

Method used

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  • Casting technique of grain refined solid manganese steel frog of long life
  • Casting technique of grain refined solid manganese steel frog of long life
  • Casting technique of grain refined solid manganese steel frog of long life

Examples

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Effect test

Embodiment 1

[0042] The temperature of the molten steel is 1590°C, the weight of the poured molten metal is 10.1 tons, and it is refined in the refining ladle. During the refining process, the argon pressure is 0.2MPa, the inner diameter of the pressure pipe is Φ10mm, the argon blowing time is 1 minute / ton of molten steel, and the wire feeding amount is 0.4% of the total weight of molten steel is poured, and the feeding wire is Si-Ca wire commonly used in refining. After removal of inclusions, microalloying is carried out at a temperature of 1550°C, and molybdenum, niobium, vanadium, and titanium are added, and the weight ratio of the added elements is 0.05% respectively. Pouring 5 frogs, the schematic diagram of frog casting process is as follows figure 1As shown, the gate 1 and the runner 13 connected with the gate 1 are located on one side of the casting, and the thermal insulation risers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12. The pouring temperature is 1490°C, the cavity is filled with ...

Embodiment 2

[0047] The temperature of the molten steel is 1600°C, the weight of the poured molten metal is 10.3 tons, and it is refined in the refining ladle. During the refining process, the argon pressure is 0.3MPa, the inner diameter of the pressure pipe is Φ15mm, the argon blowing time is 0.6 minutes per ton of molten steel, and the wire feeding amount is 0.5% of the total weight of molten steel is poured, and the feeding wire is Si-Ca wire commonly used in refining. After removal of inclusions, microalloying is carried out at a temperature of 1560°C, and molybdenum, niobium, vanadium, and titanium are added, and the weight ratio of the added elements is 0.08% respectively. Pouring 5 frogs, the schematic diagram of frog casting process is as follows figure 1 shown. The pouring temperature is 1500°C, the cavity is filled with argon gas before pouring, and the pouring is carried out under the protection of argon gas. A heat preservation riser with a height-to-diameter ratio of 3:1 is u...

Embodiment 3

[0050] The temperature of the molten steel is 1610°C, the weight of the poured molten metal is 10.2 tons, and it is refined in the refining ladle. During the refining process, the argon pressure is 0.5MPa, the inner diameter of the pressure pipe is Φ20mm, the argon blowing time is 0.5 minutes / ton of molten steel, and the wire feeding amount is 1% of the total weight of molten steel is poured, and the feeding wire is Si-Ca wire commonly used in refining. After removal of inclusions, microalloying is carried out at a temperature of 1570°C, and molybdenum, niobium, vanadium, and titanium are added, and the weight ratio of the added elements is 0.1% respectively. Pouring 5 frogs, the schematic diagram of frog casting process is as follows figure 1 shown. The pouring temperature is 1480°C, the cavity is filled with argon gas before pouring, and the pouring is carried out under the protection of argon gas. A heat preservation riser with a height-to-diameter ratio of 3.5:1 is used. ...

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Abstract

The invention relates to a process for manufacturing a solid high manganese steel frog, in particular to a technique for casting the solid high manganese steel frog which has long service life and is subjected to grain refining. The technique is suitable for manufacturing various types and specifications of solid high manganese steel frogs with a weight of less than 2 tons. The technique comprises: 1) adopting a heat-insulated riser as a riser; 2) discharging molten steel at a high temperature, and performing argon gas blowing, feeding and refining in a refining ladle after discharging; 3) performing microalloying in the refining ladle, and adding molybdenum, niobium, vanadium and titanium; 4) filling argon gas into a die cavity before casting, and performing casting under the protection of the argon gas; and 5) adopting a hot shake-out process, thermally cutting the riser, and thermally sending the cut riser into a heat treatment kiln for homogenizing. The process reduces oxidation of molten metals through nitrogen protection, purifies the molten metals due to refining in the refining ladle, and solves the problems of large crystal grains, hole shrinkage, microcracks, short service life and the like of the solid high manganese steel frog due to grain microalloying and thinning and dispersed distribution of inclusion.

Description

technical field [0001] The invention relates to a manufacturing technology of a high manganese steel monolithic frog, in particular to a casting process of a long-life, fine-grained high manganese steel monolithic frog. It is suitable for the manufacturing process of high manganese steel monolithic frogs of various models and specifications under 2 tons. Background technique [0002] Railway is the main artery of national economic development, undertaking a large number of passenger transport and cargo transport tasks. The efficient and safe operation of the railway is guaranteed by the track, and the railway turnout is a key part of the railway track, and it is also a vulnerable part. my country is one of the countries with large railway traffic volume and density in the world. The average number of turnouts is 1.1-1.8 sets / Km, and there are more than 150,000 sets of turnouts in the whole road, including 33,500 sets of 60kg / m steel track switches on the main line. The fro...

Claims

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Application Information

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IPC IPC(8): B22D25/00C22C33/04C21C7/072B22C9/08B22D27/00
Inventor 傅排先康秀红夏立军李殿中商建平黄春元陈宝功曹桂林
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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